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Philosophy of mind is a branch of
philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about Metaphysics, existence, reason, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Philosophy of language, language. Such questio ...

philosophy
that studies the
ontology Ontology is the branch of philosophy that studies concepts such as existence, being, Becoming (philosophy), becoming, and reality. It includes the questions of how entities are grouped into Category of being, basic categories and which of these ...

ontology
and nature of the
mind The mind is the set of faculties responsible for mental phenomena A phenomenon (; plural phenomena) is an observable fact or event. The term came into its modern philosophical Philosophy (from , ) is the study of general and fun ...

mind
and its relationship with the body. The
mind–body problem The mind–body problem is a debate concerning the relationship between thought and in the human mind, and the brain as part of the physical body. It is distinct from the question of how mind and body function chemically and , as that question ...
is a paradigmatic issue in philosophy of mind, although a number of other issues are addressed, such as the
hard problem of consciousness The hard problem of consciousness is the problem of explaining why and how we have qualia In philosophy and certain models of psychology, qualia ( or ; singular form: quale) are defined as individual instances of Subjectivity, subjective, conscio ...
and the nature of particular mental states.Siegel, S.: ''The Contents of Visual Experience''. New York: Oxford University Press. 2010.Macpherson, F. & Haddock, A., editors, ''Disjunctivism: Perception, Action, Knowledge'', Oxford: Oxford University Press, 2008. Aspects of the mind that are studied include
mental event A mental event is any event that happens within the mind of a Consciousness, conscious individual. Examples include thoughts, feelings, decisions, dreams, and realizations. Some believe that mental events are not limited to human thought but can ...
s,
mental function Cognition () refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses many aspects of intellectual function Intellectual functioning refers to the "general ment ...
s,
mental properties A mental state is a state of mind that an Agency (philosophy), agent is in. Most simplistically, a mental state is a mental condition. It is a relation that connects the agent with a proposition. Several of these states are a combination of mental ...
,
consciousness Consciousness, at its simplest, is sentience or awareness of internal and external existence. Despite millennia of analyses, definitions, explanations and debates by philosophers and scientists, consciousness remains puzzling and controversial ...

consciousness
, the ontology of the mind, the nature of thought, and the relationship of the mind to the body.
Dualism Dualism most commonly refers to: * Mind–body dualism, a philosophical view which holds that mental phenomena are, at least in certain respects, not physical phenomena, or that the mind and the body are distinct and separable from one another ** P ...
and
monism Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished: * Priority monism states that all existing things go back to a source that is distinct from them; e.g., i ...
are the two central
schools of thought A school of thought, or intellectual tradition, is the perspective of a group of people who share common characteristics of opinion or outlook of a philosophy, List of academic disciplines, discipline, belief, social movement, Schools of economic ...
on the mind–body problem, although nuanced views have arisen that do not fit one or the other category neatly. * Dualism finds its entry into Western philosophy thanks to
René Descartes René Descartes ( or ; ; Latinized Latinisation or Latinization can refer to: * Latinisation of names, the practice of rendering a non-Latin name in a Latin style * Latinisation in the Soviet Union, the campaign in the USSR during the 1920s ...

René Descartes
in the 17th century. Substance dualists like Descartes argue that the mind is an independently existing
substance Substance may refer to: * Substance (Jainism), a term in Jain ontology to denote the base or owner of attributes * Chemical substance, a material with a definite chemical composition * Matter, anything that has mass and takes up space * Substance th ...
, whereas
property dualists
property dualists
maintain that the mind is a group of independent properties that
emerge Emerge may refer to: * ''Emerge: The Best of Neocolours'', the fourth album of Neocolours * Emerge Desktop, a Desktop shell replacement for Microsoft Windows * Emerge (magazine), ''Emerge'' (magazine), a defunct news magazine * Emerge Stimulation D ...
from and cannot be reduced to the brain, but that it is not a distinct substance.Hart, W.D. (1996) "Dualism", in Samuel Guttenplan (org) ''A Companion to the Philosophy of Mind'', Blackwell, Oxford, 265-7. * Monism is the position that mind and body are
ontologically Ontology is the branch of philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, Metaphysics, existence, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Ph ...

ontologically
indiscernible entities, not dependent substances. This view was first advocated in
Western philosophy Western philosophy encompasses the philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality ...
by
Parmenides Parmenides of Elea (; grc-gre, Παρμενίδης ὁ Ἐλεάτης; ) was a pre-Socratic Greek philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit ...

Parmenides
in the 5th century BCE and was later espoused by the 17th-century rationalist
Baruch Spinoza Baruch (de) Spinoza (; ; ; born Baruch Espinosa; later as an author and a correspondent Benedictus de Spinoza, anglicized to Benedict de Spinoza; 24 November 1632 – 21 February 1677) was a Dutch philosopher of Spanish and Portuguese Jews, Por ...

Baruch Spinoza
.Spinoza, Baruch (1670) ''
Tractatus Theologico-Politicus Written by the Dutch philosopher Benedictus Spinoza Baruch (de) Spinoza (; ; ; born Baruch Espinosa; later as an author and a correspondent Benedictus de Spinoza, anglicized to Benedict de Spinoza; 24 November 1632 – 21 February 1677) ...
'' (A Theologico-Political Treatise).
Physicalists argue that only entities postulated by physical theory exist, and that mental processes will eventually be explained in terms of these entities as physical theory continues to evolve. Physicalists maintain various positions on the prospects of reducing mental properties to physical properties (many of whom adopt compatible forms of property dualism), See also See also and the ontological status of such mental properties remains unclear.
Idealists In philosophy, idealism is a diverse group of metaphysics, metaphysical views which all assert that "reality" is in some way indistinguishable or inseparable from human perception and/or understanding, that it is in some sense mentally construct ...
maintain that the mind is all that exists and that the external world is either mental itself, or an illusion created by the mind. Neutral monists such as
Ernst Mach Ernst Waldfried Josef Wenzel Mach (; ; 18 February 1838 – 19 February 1916) was an Austrian physicist and philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , t ...

Ernst Mach
and
William James William James (January 11, 1842 – August 26, 1910) was an American philosopher American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the United States ** Americans, citi ...
argue that events in the world can be thought of as either mental (psychological) or physical depending on the network of relationships into which they enter, and dual-aspect monists such as
Spinoza Baruch (de) Spinoza (; ; ; born Baruch Espinosa; later as an author and a correspondent Benedictus de Spinoza, anglicized to Benedict de Spinoza; 24 November 1632 – 21 February 1677) was a Dutch philosopher of Spanish and Portuguese Jews, Port ...

Spinoza
adhere to the position that there is some other, neutral substance, and that both matter and mind are properties of this unknown substance. The most common monisms in the 20th and 21st centuries have all been variations of physicalism; these positions include
behaviorism Behaviorism is a systematic approach to understanding the behavior of humans and other animals. It assumes that behavior is either a reflex In biology Biology is the natural science that studies life and living organisms, including thei ...
, the type identity theory,
anomalous monismAnomalous monism is a philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality Reality is the sum ...

anomalous monism
and functionalism.Kim, J., "Mind–Body Problem", ''Oxford Companion to Philosophy''. Ted Honderich (ed.). Oxford:Oxford University Press. 1995. Most modern philosophers of mind adopt either a reductive physicalist or non-reductive physicalist position, maintaining in their different ways that the mind is not something separate from the body. These approaches have been particularly influential in the sciences, especially in the fields of
sociobiology Sociobiology is a field of biology Biology is the natural science that studies life and living organisms, including their anatomy, physical structure, Biochemistry, chemical processes, Molecular biology, molecular interactions, Physiology ...
,
computer science Computer science deals with the theoretical foundations of information, algorithms and the architectures of its computation as well as practical techniques for their application. Computer science is the study of computation, automation, a ...
(specifically,
artificial intelligence Artificial intelligence (AI) is intelligence Intelligence has been defined in many ways: the capacity for abstraction Abstraction in its main sense is a conceptual process where general rules and concept Concepts are defined as abstra ...

artificial intelligence
),
evolutionary psychology Evolutionary psychology is a theoretical approach in the social Social organisms, including humans, live collectively in interacting populations. This interaction is considered social whether they are aware of it or not, and whether the exchang ...
and the various
neuroscience Neuroscience is the scientific study of the nervous system In biology, the classical doctrine of the nervous system determines that it is a Complex system, highly complex part of an animal that coordinates its Behavior, actions and Sens ...

neuroscience
s.Pinel, J. ''Psychobiology'', (1990) Prentice Hall, Inc. LeDoux, J. (2002) ''The Synaptic Self: How Our Brains Become Who We Are'', New York:Viking Penguin. Russell, S. and Norvig, P. '' Artificial Intelligence: A Modern Approach'', New Jersey:Prentice Hall. Dawkins, R. ''The Selfish Gene'' (1976) Oxford:Oxford University Press. ISBN Reductive physicalists assert that all mental states and properties will eventually be explained by scientific accounts of physiological processes and states. Non-reductive physicalists argue that although the mind is not a separate substance, mental properties supervene on physical properties, or that the predicates and vocabulary used in mental descriptions and explanations are indispensable, and cannot be reduced to the language and lower-level explanations of physical science.Putnam, Hilary (1967).
Psychological Predicates
, in W. H. Capitan and D. D. Merrill, eds., ''Art, Mind and Religion'' (Pittsburgh: University of Pittsburgh Press.)
Continued neuroscientific progress has helped to clarify some of these issues; however, they are far from being resolved. Modern philosophers of mind continue to ask how the subjective qualities and the
intentionality ''Intentionality'' is the power of minds to be about something: to represent or to stand for things, properties and states of affairs. Intentionality is primarily ascribed to mental states, like perceptions, beliefs or desires, which is why it has ...
of mental states and properties can be explained in naturalistic terms. However, a number of issues have been recognized with non-reductive physicalism. First, it is irreconcilable with self-identity over time. Secondly, intentional states of consciousness do not make sense on non-reductive physicalism. Thirdly, free will is impossible to reconcile with either reductive or non-reductive physicalism. Fourthly, it fails to properly explain the phenomenon of mental causation.


Mind–body problem

The mind–body problem concerns the explanation of the relationship that exists between
mind The mind is the set of faculties responsible for mental phenomena A phenomenon (; plural phenomena) is an observable fact or event. The term came into its modern philosophical Philosophy (from , ) is the study of general and fun ...

mind
s, or
mental processes Cognition () refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses many aspects of intellectual function Intellectual functioning refers to the "general ment ...

mental processes
, and bodily states or processes. The main aim of philosophers working in this area is to determine the nature of the mind and mental states/processes, and how—or even if—minds are affected by and can affect the body.
Perceptual Perception (from the Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken in the area around Rome, known as Latium. Through the powe ...
experiences depend on
stimuli A stimulus is something that causes a physiological response. It may refer to: *Stimulation Stimulation is the encouragement of development or the cause of activity generally. For example, "The press provides stimulation of political discourse." ...
that arrive at our various
sensory organs Sense relates to any of the systems and corresponding organs involved in sensation, i.e. the physical process of responding to stimuli and providing data Data are units of information Information can be thought of as the resolution of ...
from the external world, and these stimuli cause changes in our mental states, ultimately causing us to feel a sensation, which may be pleasant or unpleasant. Someone's desire for a slice of pizza, for example, will tend to cause that person to move his or her body in a specific manner and in a specific direction to obtain what he or she wants. The question, then, is how it can be possible for conscious experiences to arise out of a lump of gray matter endowed with nothing but electrochemical properties. A related problem is how someone's
propositional attitude A propositional attitude is a mental state held by an agent toward a proposition In logic and linguistics, a proposition is the meaning of a declarative sentence (linguistics), sentence. In philosophy, "Meaning (philosophy), meaning" is understood ...
s (e.g. beliefs and desires) cause that individual's
neuron A neuron or nerve cell is an electrically excitable cell that communicates with other cells via specialized connections called synapse In the nervous system In biology Biology is the natural science that studies life and living ...

neuron
s to fire and muscles to contract. These comprise some of the puzzles that have confronted
epistemologists Epistemology (; ) is the branch Image:Tree Leaves.JPG, The branches and leaves of a tree. A branch ( or , ) or tree branch (sometimes referred to in botany as a ramus) is a woody structural member connected to but not part of the central ...

epistemologists
and philosophers of mind from the time of
René Descartes René Descartes ( or ; ; Latinized Latinisation or Latinization can refer to: * Latinisation of names, the practice of rendering a non-Latin name in a Latin style * Latinisation in the Soviet Union, the campaign in the USSR during the 1920s ...

René Descartes
.


Dualist solutions to the mind–body problem

Dualism Dualism most commonly refers to: * Mind–body dualism, a philosophical view which holds that mental phenomena are, at least in certain respects, not physical phenomena, or that the mind and the body are distinct and separable from one another ** P ...
is a set of views about the relationship between
mind The mind is the set of faculties responsible for mental phenomena A phenomenon (; plural phenomena) is an observable fact or event. The term came into its modern philosophical Philosophy (from , ) is the study of general and fun ...

mind
and
matter In classical physics Classical physics is a group of physics theories that predate modern, more complete, or more widely applicable theories. If a currently accepted theory is considered to be modern, and its introduction represented a major ...
(or
body Body may refer to: In science * Physical body, an object in physics that represents a large amount, has mass or takes up space * Body (biology), the physical material of an organism * Body plan, the physical features shared by a group of animals ...

body
). It begins with the claim that mental
phenomena A phenomenon (; plural phenomena) is an observable fact or event. The term came into its modern philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, existence, knowledge ...
are, in some respects, non-
physical Physical may refer to: *Physical examination, a regular overall check-up with a doctor *Physical (album), ''Physical'' (album), a 1981 album by Olivia Newton-John **Physical (Olivia Newton-John song), "Physical" (Olivia Newton-John song) *Physical ( ...

physical
. One of the earliest known formulations of mind–body dualism was expressed in the eastern
Samkhya ''Samkhya'' ( sa, साङ्ख्य, IAST The International Alphabet of Sanskrit Transliteration (IAST) is a transliteration scheme that allows the lossless romanisation of Brahmic family, Indic scripts as employed by Sanskrit and re ...
and
Yoga Yoga (; sa, योग, lit=yoke' or 'union ) is a group of Asana, physical, mind, mental, and Spirituality#Asian traditions, spiritual practices or disciplines that originated in History of India, ancient India, aimed at controlling ('y ...

Yoga
schools of
Hindu philosophy Hindu philosophy encompasses the philosophies, world views and teachings of Hinduism Hinduism () is an Indian religion Indian religions, sometimes also termed Dharmic religions or Indic religions, are the religions that origina ...
(c. 650 BCE), which divided the world into
purusha ''Purusha'' (' or ) is a complex concept whose meaning evolved in Vedic upright=1.2, The Vedas are ancient Sanskrit texts of Hinduism. Above: A page from the ''Atharvaveda''. The Vedas (, , ) are a large body of religious texts originating ...
(mind/spirit) and prakriti (material substance). Specifically, the
Yoga Sutra The ''Yoga Sutras of Patañjali'' is a collection of Sanskrit sutra Sutra ( sa, सूत्र, translit=sūtra, translit-std=IAST, translation=string, threadMonier Williams, ''Sanskrit English Dictionary'', Oxford University Press ...
of
Patanjali Patañjali ( ta, பதஞ்சலி, sa, पतञ्जलि) was a sage in ancient Tamilakam Tamilakam (: ''tamiḻakam'') refers to the geographical region inhabited by the ancient . Tamilakam covered today's , , , and southern p ...

Patanjali
presents an analytical approach to the nature of the mind. In
Western Philosophy Western philosophy encompasses the philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality ...
, the earliest discussions of dualist ideas are in the writings of
Plato Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was an Classical Athens, Athenian philosopher during the Classical Greece, Classical period in Ancient Greece, founder of the Platonist school of thought and the Platoni ...

Plato
who suggested that humans' ''intelligence'' (a faculty of the mind or soul) could not be identified with, or explained in terms of, their physical body.Robinson, H. (1983): "Aristotelian dualism", Oxford Studies in Ancient Philosophy 1, 123–44. However, the best-known version of dualism is due to
René Descartes René Descartes ( or ; ; Latinized Latinisation or Latinization can refer to: * Latinisation of names, the practice of rendering a non-Latin name in a Latin style * Latinisation in the Soviet Union, the campaign in the USSR during the 1920s ...

René Descartes
(1641), and holds that the mind is a non-extended, non-physical substance, a " res cogitans". Descartes was the first to clearly identify the mind with
consciousness Consciousness, at its simplest, is sentience or awareness of internal and external existence. Despite millennia of analyses, definitions, explanations and debates by philosophers and scientists, consciousness remains puzzling and controversial ...

consciousness
and
self-awareness In philosophy of self The philosophy of self is the study of the many conditions of identity Identity may refer to: Social sciences * Identity (social science), personhood or group affiliation in psychology and sociology Group expre ...
, and to distinguish this from the brain, which was the seat of intelligence. He was therefore the first to formulate the mind–body problem in the form in which it still exists today.


Arguments for dualism

The most frequently used argument in favor of dualism appeals to the common-sense intuition that conscious experience is distinct from inanimate matter. If asked what the mind is, the average person would usually respond by identifying it with their
self The self is an individual person as the object of its own reflective consciousness Consciousness, at its simplest, is or of internal and external existence. Despite millennia of analyses, definitions, explanations and debates by philosoph ...
, their personality, their
soul In many religious, philosophical, and myth Myth is a folklore genre consisting of narratives that play a fundamental role in a society, such as foundational tales or origin myths. The main characters in myths are usually non-humans, such as ...

soul
, or another related entity. They would almost certainly deny that the mind simply is the brain, or vice versa, finding the idea that there is just one
ontological Ontology is the branch of philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, Metaphysics, existence, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Ph ...

ontological
entity at play to be too mechanistic or unintelligible. Modern philosophers of mind think that these intuitions are misleading, and that critical faculties, along with
empirical evidence Empirical evidence for a proposition In logic and linguistics, a proposition is the meaning of a declarative sentence (linguistics), sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguistic entity which is s ...
from the sciences, should be used to examine these assumptions and determine whether there is any real basis to them. The mental and the physical seem to have quite different, and perhaps irreconcilable, properties.Jackson, F. (1982) "Epiphenomenal Qualia." Reprinted in Chalmers, David ed. :2002. ''Philosophy of Mind: Classical and Contemporary Readings''. Oxford University Press. Mental events have a subjective quality, whereas physical events do not. So, for example, one can reasonably ask what a burnt finger feels like, or what a blue sky looks like, or what nice music sounds like to a person. But it is meaningless, or at least odd, to ask what a surge in the uptake of
glutamate Glutamic acid (symbol Glu or E; the ionic form is known as glutamate) is an α-amino acid Amino acids are organic compounds that contain amino (–NH2) and Carboxylic acid, carboxyl (–COOH) functional groups, along with a Substituent, sid ...
in the dorsolateral portion of the
prefrontal cortex In mammalian brain A brain is an organ that serves as the center of the nervous system In Biology, biology, the nervous system is a Complex system, highly complex part of an animal that coordinates its Behavior, actions and Sense, senso ...

prefrontal cortex
feels like. Philosophers of mind call the subjective aspects of mental events "
qualia In philosophy of mind Philosophy of mind is a branch of that studies the and nature of the and its relationship with the body. The is a paradigmatic issue in philosophy of mind, although a number of other issues are addressed, such as the ...
" or "raw feels". There are qualia involved in these mental events that seem particularly difficult to reduce to anything physical. David Chalmers explains this argument by stating that we could conceivably know all the objective information about something, such as the brain states and wavelengths of light involved with seeing the color red, but still not know something fundamental about the situation – what it is like to see the color red. If consciousness (the mind) can exist independently of physical reality (the brain), one must explain how physical memories are created concerning consciousness. Dualism must therefore explain how consciousness affects physical reality. One possible explanation is that of a miracle, proposed by and
Nicolas Malebranche Nicolas Malebranche ( , ; 6 August 1638 – 13 October 1715) was a French French (french: français(e), link=no) may refer to: * Something of, from, or related to France France (), officially the French Republic (french: link=no, Républ ...

Nicolas Malebranche
, where all mind–body interactions require the direct intervention of God. Another argument that has been proposed by C. S. Lewis is the
Argument from Reason The argument from reason is an argument against metaphysical naturalism and for the existence of God (or at least a supernatural being that is the source of human reason). The best-known defender of the argument is C. S. Lewis. Lewis first defended ...
: if, as monism implies, all of our thoughts are the effects of physical causes, then we have no reason for assuming that they are also the
consequent A consequent is the second half of a hypothetical proposition In linguistics and logic, a proposition is the meaning of a declarative sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguistic entity which i ...
of a reasonable ground. Knowledge, however, is apprehended by reasoning from ground to consequent. Therefore, if monism is correct, there would be no way of knowing this—or anything else—we could not even suppose it, except by a fluke. The zombie argument is based on a
thought experiment A thought experiment is a hypothetical situation in which a hypothesis A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can t ...
proposed by Todd Moody, and developed by
David Chalmers David John Chalmers (; born 20 April 1966) is an Australian Australians, colloquially referred to as "Aussies", are the citizens Citizenship is a relationship between an individual and a state to which the individual owes allegiance ...

David Chalmers
in his book ''
The Conscious Mind ''The Conscious Mind: In Search of a Fundamental Theory'' was published in 1996, and is the first book written by David Chalmers David John Chalmers (; born 20 April 1966) is an Australian Australians, colloquially referred to as "Auss ...
''. The basic idea is that one can imagine one's body, and therefore conceive the existence of one's body, without any conscious states being associated with this body. Chalmers' argument is that it seems possible that such a being could exist because all that is needed is that all and only the things that the physical sciences describe about a zombie must be true of it. Since none of the concepts involved in these sciences make reference to consciousness or other mental phenomena, and any physical entity can be by definition described scientifically via
physics Physics is the natural science that studies matter, its Elementary particle, fundamental constituents, its Motion (physics), motion and behavior through Spacetime, space and time, and the related entities of energy and force. "Physical scie ...

physics
, the move from conceivability to possibility is not such a large one. Others such as Dennett have argued that the notion of a philosophical zombie is an incoherent, or unlikely, concept. It has been argued under physicalism that one must either believe that anyone including oneself might be a zombie, or that no one can be a zombie—following from the assertion that one's own conviction about being (or not being) a zombie is a product of the physical world and is therefore no different from anyone else's. This argument has been expressed by Dennett who argues that "Zombies think they are conscious, think they have qualia, think they suffer pains—they are just 'wrong' (according to this lamentable tradition) in ways that neither they nor we could ever discover!" See also the
problem of other minds The problem of other minds is a philosophical problem traditionally stated as the following epistemological Epistemology (; ) is the branch of philosophy Philosophy (from , ) is the study of general and fundamental questions, suc ...
.


Interactionist dualism

Interactionist dualism, or simply interactionism, is the particular form of dualism first espoused by Descartes in the ''Meditations''. In the 20th century, its major defenders have been
Karl Popper Sir Karl Raimund Popper (28 July 1902 – 17 September 1994) was an Austrian-British philosopher A philosopher is someone who practices philosophy Philosophy (from , ) is the study of general and fundamental questions, such as tho ...

Karl Popper
and
John Carew Eccles Sir John Carew Eccles (27 January 1903 – 2 May 1997) was an Australian neurophysiologist and philosopher who won the 1963 Nobel Prize in Physiology or Medicine ) , name = The Nobel Prize in Physiology or Medicine , image = Nobel ...
. It is the view that mental states, such as beliefs and desires, causally interact with physical states. Descartes' argument for this position can be summarized as follows: Seth has a clear and distinct idea of his mind as a thinking thing that has no spatial extension (i.e., it cannot be measured in terms of length, weight, height, and so on). He also has a clear and distinct idea of his body as something that is spatially extended, subject to quantification and not able to think. It follows that mind and body are not identical because they have radically different properties. Seth's mental states (desires, beliefs, etc.) have
causal Causality (also referred to as causation, or cause and effect) is influence by which one event Event may refer to: Gatherings of people * Ceremony A ceremony (, ) is a unified ritual A ritual is a sequence of activities involving gestur ...
effects on his body and vice versa: A child touches a hot stove (physical event) which causes pain (mental event) and makes her yell (physical event), this in turn provokes a sense of fear and protectiveness in the caregiver (mental event), and so on. Descartes' argument depends on the premise that what Seth believes to be "clear and distinct" ideas in his mind are
necessarily true Logical truth is one of the most fundamental concept Concepts are defined as abstract ideas or general notions that occur in the mind, in speech, or in thought. They are understood to be the fundamental building blocks of thoughts and belief ...
. Many contemporary philosophers doubt this.Dennett D., (1991), ''Consciousness Explained'', Boston: Little, Brown & CompanyStich, S., (1983), ''From Folk Psychology to Cognitive Science''. Cambridge, MA:
MIT Press The MIT Press is a university press A university press is an academic publishing Publishing is the activity of making information, literature, music, software and other content available to the public for sale or for free. Traditionally, the ...
(Bradford)
For example,
Joseph Agassi Joseph Agassi (; he, יוסף אגסי; born in Jerusalem Jerusalem (; he, יְרוּשָׁלַיִם ; ar, القُدس (combining the Biblical and common usage Arabic names); grc, Ἱερουσαλήμ/Ἰεροσόλυμα, Hierousa ...
suggests that several scientific discoveries made since the early 20th century have undermined the idea of privileged access to one's own ideas.
Freud Sigmund Freud ( , ; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist Neurology (from el, νεῦρον (neûron), "string, nerve" and the suffix -logia ''-logy'' is a suffix in the English l ...

Freud
claimed that a psychologically-trained observer can understand a person's unconscious motivations better than the person himself does. has shown that a philosopher of science can know a person's methods of discovery better than that person herself does, while
Malinowski Malinowski (Polish pronunciation: ; plural: Malinowscy) is a surname of Polish-language origin. It is related to the following surnames: People * (born 1954), Polish Army general * (born 1947), Polish politician *Bronisław Malinowski (1884–1 ...

Malinowski
has shown that an anthropologist can know a person's customs and habits better than the person whose customs and habits they are. He also asserts that modern psychological experiments that cause people to see things that are not there provide grounds for rejecting Descartes' argument, because scientists can describe a person's perceptions better than the person herself can.


Other forms of dualism


=Psychophysical parallelism

=
Psychophysical parallelism In the philosophy of mind Philosophy of mind is a branch of philosophy that studies the ontology and nature of the mind and its relationship with the body. The mind–body problem is a paradigmatic issue in philosophy of mind, although a number ...
, or simply parallelism, is the view that mind and body, while having distinct ontological statuses, do not causally influence one another. Instead, they run along parallel paths (mind events causally interact with mind events and brain events causally interact with brain events) and only seem to influence each other. This view was most prominently defended by
Gottfried Leibniz Gottfried Wilhelm (von) Leibniz ; see inscription of the engraving depicted in the " 1666–1676" section. ( – 14 November 1716) was a German polymath A polymath ( el, πολυμαθής, , "having learned much"; la, homo universalis, " ...
. Although Leibniz was an ontological monist who believed that only one type of substance, the
monad Monad may refer to: Philosophy * Monad (philosophy) Monad (from Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hellenic Republic, is a country located in Southeas ...
, exists in the universe, and that everything is reducible to it, he nonetheless maintained that there was an important distinction between "the mental" and "the physical" in terms of causation. He held that God had arranged things in advance so that minds and bodies would be in harmony with each other. This is known as the doctrine of pre-established harmony.


=Occasionalism

=
Occasionalism Occasionalism is a philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality Reality is the sum ...

Occasionalism
is the view espoused by Nicholas Malebranche as well as Islamic philosophers such as that asserts all supposedly causal relations between physical events, or between physical and mental events, are not really causal at all. While body and mind are different substances, causes (whether mental or physical) are related to their effects by an act of God's intervention on each specific occasion.


=Property dualism

=
Property dualism Property dualism: the exemplification of two kinds of property by one kind of substance Property dualism describes a category of positions in the philosophy of mind which hold that, although the world is composed of just one kind of substance the ...

Property dualism
is the view that the world is constituted of one kind of
substance Substance may refer to: * Substance (Jainism), a term in Jain ontology to denote the base or owner of attributes * Chemical substance, a material with a definite chemical composition * Matter, anything that has mass and takes up space * Substance th ...
– the physical kind – and there exist two distinct kinds of properties:
physical properties A physical property is any Property (philosophy), property that is Measurement, measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its changes between momenta ...
and
mental properties A mental state is a state of mind that an Agency (philosophy), agent is in. Most simplistically, a mental state is a mental condition. It is a relation that connects the agent with a proposition. Several of these states are a combination of mental ...
. It is the view that non-physical, mental properties (such as beliefs, desires and emotions) inhere in some physical bodies (at least, brains). Sub-varieties of property dualism include: # Emergent materialism asserts that when matter is organized in the appropriate way (i.e. in the way that living human bodies are organized), mental properties emerge in a way not fully accountable for by physical laws. These emergent properties have an independent ontological status and cannot be reduced to, or explained in terms of, the physical substrate from which they emerge. They are dependent on the physical properties from which they emerge, but opinions vary as to the coherence of top–down causation, i.e. the causal effectiveness of such properties. A form of emergent materialism has been espoused by
David Chalmers David John Chalmers (; born 20 April 1966) is an Australian Australians, colloquially referred to as "Aussies", are the citizens Citizenship is a relationship between an individual and a state to which the individual owes allegiance ...

David Chalmers
and the concept has undergone something of a renaissance in recent years, but it was already suggested in the 19th century by
William James William James (January 11, 1842 – August 26, 1910) was an American philosopher American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the United States ** Americans, citi ...
. #Epiphenomenalism is a doctrine first formulated by Thomas Henry Huxley. It consists of the view that mental phenomena are causally ineffectual, where one or more mental states do not have any influence on physical states or mental phenomena are the effects, but not the causes, of physical phenomena. Physical events can cause other physical and mental events, but mental events cannot cause anything since they are just causally inert by-products (i.e. epiphenomena) of the physical world. This view has been defended by Frank Cameron Jackson, Frank Jackson. #Property dualism#Non-reductive Physicalism, Non-reductive physicalism is the view that mental properties form a separate ontological class to physical properties: mental states (such as qualia) are not reducible to physical states. The ontological stance towards qualia in the case of non-reductive physicalism does not imply that qualia are causally inert; this is what distinguishes it from epiphenomenalism. #Panpsychism is the view that all matter has a mental aspect, or, alternatively, all objects have a unified center of experience or point of view. Superficially, it seems to be a form of property dualism, since it regards everything as having both mental and physical properties. However, some panpsychists say that mechanical behaviour is derived from the primitive mentality of atoms and molecules—as are sophisticated mentality and organic behaviour, the difference being attributed to the presence or absence of complexity, complex structure in a compound object. So long as the ''reduction'' of non-mental properties to mental ones is in place, panpsychism is not a (strong) form of property dualism; otherwise it is.


=Dual aspect theory

= Dual aspect theory or dual-aspect monism is the view that the mind, mental and the
physical Physical may refer to: *Physical examination, a regular overall check-up with a doctor *Physical (album), ''Physical'' (album), a 1981 album by Olivia Newton-John **Physical (Olivia Newton-John song), "Physical" (Olivia Newton-John song) *Physical ( ...

physical
are two aspects of, or perspectives on, the same substance. (Thus it is a mixed position, which is monistic in some respects). In modern philosophical writings, the theory's relationship to neutral monism has become somewhat ill-defined, but one proffered distinction says that whereas neutral monism allows the context of a given group of neutral elements and the relationships into which they enter to determine whether the group can be thought of as mental, physical, both, or neither, dual-aspect theory suggests that the mental and the physical are manifestations (or aspects) of some underlying substance, entity or process that is itself neither mental nor physical as normally understood. Various formulations of dual-aspect monism also require the mental and the physical to be complementary, mutually irreducible and perhaps inseparable (though distinct).


= Experiential dualism

= This is a philosophy of mind that regards the degrees of freedom between mental and physical well-being as not synonymous thus implying an experiential dualism between body and mind. An example of these disparate degrees of freedom is given by B. Alan Wallace, Allan Wallace who notes that it is "experientially apparent that one may be physically uncomfortable—for instance, while engaging in a strenuous physical workout—while mentally cheerful; conversely, one may be mentally distraught while experiencing physical comfort". Experiential dualism notes that our subjective experience of merely seeing something in the physical world seems qualitatively different from mental processes like grief that comes from losing a loved one. This philosophy is a proponent of causal dualism, which is defined as the dual ability for mental states and physical states to affect one another. Mental states can cause changes in physical states and vice versa. However, unlike cartesian dualism or some other systems, experiential dualism does not posit two fundamental substances in reality: mind and matter. Rather, experiential dualism is to be understood as a conceptual framework that gives credence to the qualitative difference between the experience of mental and physical states. Experiential dualism is accepted as the conceptual framework of Madhyamaka, Madhyamaka Buddhism. Madhayamaka Buddhism goes further, finding fault with the monist view of physicalist philosophies of mind as well in that these generally posit matter and energy as the fundamental substance of reality. Nonetheless, this does not imply that the cartesian dualist view is correct, rather Madhyamaka regards as error any affirming view of a fundamental substance to reality.
In denying the independent self-existence of all the phenomena that make up the world of our experience, the Madhyamaka view departs from both the substance dualism of Descartes and the substance monism—namely, physicalism—that is characteristic of modern science. The physicalism propounded by many contemporary scientists seems to assert that the real world is composed of physical things-in-themselves, while all mental phenomena are regarded as mere appearances, devoid of any reality in and of themselves. Much is made of this difference between appearances and reality.
Indeed, physicalism, or the idea that matter is the only fundamental substance of reality, is explicitly rejected by Buddhism.
In the Madhyamaka view, mental events are no more or less real than physical events. In terms of our common-sense experience, differences of kind do exist between physical and mental phenomena. While the former commonly have mass, location, velocity, shape, size, and numerous other physical attributes, these are not generally characteristic of mental phenomena. For example, we do not commonly conceive of the feeling of affection for another person as having mass or location. These physical attributes are no more appropriate to other mental events such as sadness, a recalled image from one's childhood, the visual perception of a rose, or consciousness of any sort. Mental phenomena are, therefore, not regarded as being physical, for the simple reason that they lack many of the attributes that are uniquely characteristic of physical phenomena. Thus, Buddhism has never adopted the physicalist principle that regards only physical things as real.


Monist solutions to the mind–body problem

In contrast to Mind-body dualism, dualism,
monism Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished: * Priority monism states that all existing things go back to a source that is distinct from them; e.g., i ...
does not accept any fundamental divisions. The fundamentally disparate nature of reality has been central to forms of eastern philosophies for over two millennia. In Indian philosophy, Indian and Chinese philosophy, monism is integral to how experience is understood. Today, the most common forms of monism in Western philosophy are physicalism, physicalist. Physicalistic monism asserts that the only existing substance is physical, in some sense of that term to be clarified by our best science. However, a variety of formulations (see below) are possible. Another form of monism, idealism, states that the only existing substance is mental. Although pure idealism, such as that of George Berkeley, is uncommon in contemporary Western philosophy, a more sophisticated variant called panpsychism, according to which mental experience and properties may be at the foundation of physical experience and properties, has been espoused by some philosophers such as Alfred North Whitehead and David Ray Griffin. Phenomenalism is the theory that representations (or sense data) of external objects are all that exist. Such a view was briefly adopted by Bertrand Russell and many of the logical positivists during the early 20th century. A third possibility is to accept the existence of a basic substance that is neither physical nor mental. The mental and physical would then both be properties of this neutral substance. Such a position was adopted by Baruch Spinoza and was popularized by
Ernst Mach Ernst Waldfried Josef Wenzel Mach (; ; 18 February 1838 – 19 February 1916) was an Austrian physicist and philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , t ...

Ernst Mach
in the 19th century. This neutral monism, as it is called, resembles property dualism.


Physicalistic monisms


=Behaviorism

= Behaviorism dominated philosophy of mind for much of the 20th century, especially the first half. In psychology, behaviorism developed as a reaction to the inadequacies of introspectionism. Introspective reports on one's own interior mental life are not subject to careful examination for accuracy and cannot be used to form predictive generalizations. Without generalizability and the possibility of third-person examination, the behaviorists argued, psychology cannot be scientific. The way out, therefore, was to eliminate the idea of an interior mental life (and hence an ontologically independent mind) altogether and focus instead on the description of observable behavior. Parallel to these developments in psychology, a philosophical behaviorism (sometimes called logical behaviorism) was developed. This is characterized by a strong verificationism, which generally considers unverifiable statements about interior mental life pointless. For the behaviorist, mental states are not interior states on which one can make introspective reports. They are just descriptions of behavior or dispositions to behave in certain ways, made by third parties to explain and predict another's behavior. Philosophical behaviorism has fallen out of favor since the latter half of the 20th century, coinciding with the rise of cognitivism (psychology), cognitivism.


=Identity theory

= Type physicalism (or type-identity theory) was developed by J. J. C. Smart, Jack Smart and Ullin Place as a direct reaction to the failure of behaviorism. These philosophers reasoned that, if mental states are something material, but not behavioral, then mental states are probably identical to internal states of the brain. In very simplified terms: a mental state ''M'' is nothing other than brain state ''B''. The mental state "desire for a cup of coffee" would thus be nothing more than the "firing of certain neurons in certain brain regions". On the other hand, even granted the above, it does not follow that identity theories of all types must be abandoned. According to token identity theories, the fact that a certain brain state is connected with only one mental state of a person does not have to mean that there is an absolute correlation between types of mental state and types of brain state. The type–token distinction can be illustrated by a simple example: the word "green" contains four types of letters (g, r, e, n) with two tokens (occurrences) of the letter ''e'' along with one each of the others. The idea of token identity is that only particular occurrences of mental events are identical with particular occurrences or tokenings of physical events. Anomalous monism (see below) and most other non-reductive physicalisms are token-identity theories. Despite these problems, there is a renewed interest in the type identity theory today, primarily due to the influence of Jaegwon Kim.


=Functionalism

= Functionalism was formulated by Hilary Putnam and Jerry Fodor as a reaction to the inadequacies of the identity theory. Putnam and Fodor saw mental states in terms of an empirical computational theory of mind, computational theory of the mind.Block, Ned. "What is functionalism" in ''Readings in Philosophy of Psychology'', 2 vols. Vol 1. (Cambridge: Harvard, 1980). At about the same time or slightly after, D.M. Armstrong and David Kellogg Lewis formulated a version of functionalism that analyzed the mental concepts of folk psychology in terms of functional roles. Finally, Ludwig Wittgenstein, Wittgenstein's idea of meaning as use led to a version of functionalism as a theory of meaning, further developed by Wilfrid Sellars and Gilbert Harman. Another one, Functionalism (philosophy of mind)#Psychofunctionalism, psychofunctionalism, is an approach adopted by the Naturalism (philosophy)#Metaphysical naturalism, naturalistic philosophy of mind associated with Jerry Fodor and Zenon Pylyshyn. Mental states are characterized by their causal relations with other mental states and with sensory inputs and behavioral outputs. Functionalism abstracts away from the details of the physical implementation of a mental state by characterizing it in terms of non-mental functional properties. For example, a kidney is characterized scientifically by its functional role in filtering blood and maintaining certain chemical balances.


=Non-reductive physicalism

= Non-reductionist philosophers hold firmly to two essential convictions with regard to mind–body relations: 1) Physicalism is true and mental states must be physical states, but 2) All reductionist proposals are unsatisfactory: mental states cannot be reduced to behavior, brain states or functional states. Hence, the question arises whether there can still be a non-reductive physicalism. Donald Davidson (philosopher), Donald Davidson's
anomalous monismAnomalous monism is a philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality Reality is the sum ...

anomalous monism
is an attempt to formulate such a physicalism. He "thinks that when one runs across what are traditionally seen as absurdities of Reason, such as akrasia or self-deception, the personal psychology framework is not to be given up in favor of the subpersonal one, but rather must be enlarged or extended so that the rationality set out by the principle of charity can be found elsewhere." Davidson uses the thesis of supervenience: mental states supervene on physical states, but are not reducible to them. "Supervenience" therefore describes a functional dependence: there can be no change in the mental without some change in the physical–causal reducibility between the mental and physical without ontological reducibility. Non-reductive physicalism, however, is irreconcilable with self-identity over time. The brain goes on from one moment of time to another; the brain thus has identity through time. But its states of awareness do not go on from one moment to the next. There is no enduring self – no “I” (capital-I) that goes on from one moment to the next. An analogy of the self or the “I” would be the flame of a candle. The candle and the wick go on from one moment to the next, but the flame does not go on. There is a different flame at each moment of the candle’s burning. The flame displays a type of continuity in that the candle does not go out while it is burning, but there is not really any identity of the flame from one moment to another over time. The scenario is similar on non-reductive physicalism with states of awareness. Every state of the brain at different times has a different state of awareness related to it, but there is no enduring self or “I” from one moment to the next. Similarly, it is an illusion that one is the same individual who walked into class this morning. In fact, one is not the same individual because there is no personal identity over time. If one does exist and one is the same individual who entered into class this morning, then a non-reductive physicalist view of the self should be dismissed. Because non-reductive physicalist theories attempt to both retain the ontological distinction between mind and body and try to solve the "surfeit of explanations puzzle" in some way; critics often see this as a paradox and point out the similarities to epiphenomenalism, in that it is the brain that is seen as the root "cause" not the mind, and the mind seems to be rendered inert. Epiphenomenalism regards one or more mental states as the byproduct of physical brain states, having no influence on physical states. The interaction is one-way (solving the "surfeit of explanations puzzle") but leaving us with non-reducible mental states (as a byproduct of brain states) – causally reducible, but ontologically irreducible to physical states. Pain would be seen by epiphenomenalists as being caused by the brain state but as not having effects on other brain states, though it might have effects on other mental states (i.e. cause distress).


=Weak emergentism

= Weak emergentism is a form of "non-reductive physicalism" that involves a layered view of nature, with the layers arranged in terms of increasing complexity and each corresponding to its own special science. Some philosophers hold that emergent properties causally interact with more fundamental levels, while others maintain that higher-order properties simply supervene over lower levels without direct causal interaction. The latter group therefore holds a less strict, or "weaker", definition of emergentism, which can be rigorously stated as follows: a property P of composite object O is emergent if it is metaphysically impossible for another object to lack property P if that object is composed of parts with intrinsic properties identical to those in O and has those parts in an identical configuration. Sometimes emergentists use the example of water having a new property when Hydrogen H and Oxygen O combine to form H2O (water). In this example there "emerges" a new property of a transparent liquid that would not have been predicted by understanding hydrogen and oxygen as gases. This is analogous to physical properties of the brain giving rise to a mental state. Emergentists try to solve the notorious mind–body gap this way. One problem for emergentism is the idea of "causal closure" in the world that does not allow for a mind-to-body causation.


=Eliminative materialism

= If one is a materialist and believes that all aspects of our common-sense psychology will find reduction to a mature cognitive neuroscience, and that non-reductive materialism is mistaken, then one can adopt a final, more radical position: eliminative materialism. There are several varieties of eliminative materialism, but all maintain that our common-sense "folk psychology" badly misrepresents the nature of some aspect of cognition. Eliminativists such as Patricia Churchland, Patricia and Paul Churchland argue that while folk psychology treats cognition as fundamentally sentence-like, the non-linguistic vector/matrix model of neural network theory or connectionism will prove to be a much more accurate account of how the brain works. The Churchlands often invoke the fate of other, erroneous popular theories and ontology, ontologies that have arisen in the course of history. For example, Ptolemaic astronomy served to explain and roughly predict the motions of the planets for centuries, but eventually this model of the solar system was eliminated in favor of the Copernican model. The Churchlands believe the same eliminative fate awaits the "sentence-cruncher" model of the mind in which thought and behavior are the result of manipulating sentence-like states called "
propositional attitude A propositional attitude is a mental state held by an agent toward a proposition In logic and linguistics, a proposition is the meaning of a declarative sentence (linguistics), sentence. In philosophy, "Meaning (philosophy), meaning" is understood ...
s".


Mysterianism

Some philosophers take an epistemic approach and argue that the mind–body problem is currently unsolvable, and perhaps will always remain unsolvable to human beings. This is usually termed New mysterianism. Colin McGinn holds that human beings are Cognitive closure (philosophy), cognitively closed in regards to their own minds. According to McGinn human minds lack the concept-forming procedures to fully grasp how mental properties such as
consciousness Consciousness, at its simplest, is sentience or awareness of internal and external existence. Despite millennia of analyses, definitions, explanations and debates by philosophers and scientists, consciousness remains puzzling and controversial ...

consciousness
arise from their causal basis. An example would be how an elephant is cognitively closed in regards to particle physics. A more moderate conception has been expounded by Thomas Nagel, which holds that the mind–body problem is currently unsolvable at the present stage of scientific development and that it might take a future scientific paradigm shift or revolution to bridge the explanatory gap. Nagel posits that in the future a sort of "objective phenomenology (philosophy), phenomenology" might be able to bridge the gap between subjective conscious experience and its physical basis.


Linguistic criticism of the mind–body problem

Each attempt to answer the mind–body problem encounters substantial problems. Some philosophers argue that this is because there is an underlying conceptual confusion. These philosophers, such as Ludwig Wittgenstein and his followers in the tradition of linguistic criticism, therefore reject the problem as illusory. They argue that it is an error to ask how mental and biological states fit together. Rather it should simply be accepted that human experience can be described in different ways—for instance, in a mental and in a biological vocabulary. Illusory problems arise if one tries to describe the one in terms of the other's vocabulary or if the mental vocabulary is used in the wrong contexts. This is the case, for instance, if one searches for mental states of the brain. The brain is simply the wrong context for the use of mental vocabulary—the search for mental states of the brain is therefore a category error or a sort of fallacy of reasoning. Today, such a position is often adopted by interpreters of Wittgenstein such as Peter Hacker. However, Hilary Putnam, the originator of functionalism, has also adopted the position that the mind–body problem is an illusory problem which should be dissolved according to the manner of Wittgenstein.


Naturalism and its problems

The thesis of physicalism is that the mind is part of the material (or physical) world. Such a position faces the problem that the mind has certain properties that no other material thing seems to possess. Physicalism must therefore explain how it is possible that these properties can nonetheless emerge from a material thing. The project of providing such an explanation is often referred to as the "naturalism (philosophy), naturalization of the mental". Some of the crucial problems that this project attempts to resolve include the existence of qualia and the nature of intentionality.


Qualia

Many mental states seem to be experienced subjectively in different ways by different individuals. And it is characteristic of a mental state that it has some experiential ''quality'', e.g. of pain, that it hurts. However, the sensation of pain between two individuals may not be identical, since no one has a perfect way to measure how much something hurts or of describing exactly how it feels to hurt. Philosophers and scientists therefore ask where these experiences come from. The existence of cerebral events, in and of themselves, cannot explain why they are accompanied by these corresponding qualitative experiences. The puzzle of why many cerebral processes occur with an accompanying experiential aspect in consciousness seems impossible to explain. Yet it also seems to many that science will eventually have to explain such experiences. This Logical consequence, follows from an assumption about the possibility of reductionism, reductive explanations. According to this view, if an attempt can be successfully made to explain a phenomenon reductively (e.g., water), then it can be explained why the phenomenon has all of its properties (e.g., fluidity, transparency). In the case of mental states, this means that there needs to be an explanation of why they have the property of being experienced in a certain way. The 20th-century German philosopher Martin Heidegger criticized the
ontological Ontology is the branch of philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, Metaphysics, existence, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Ph ...

ontological
assumptions underpinning such a reductive model, and claimed that it was impossible to make sense of experience in these terms. This is because, according to Heidegger, the nature of our subjective experience and its ''qualities'' is impossible to understand in terms of Descartes, Cartesian "substances" that bear "properties". Another way to put this is that the very concept of qualitative experience is incoherent in terms of—or is semantically Commensurability (philosophy of science), incommensurable with the concept of—substances that bear properties. This problem of explaining introspective first-person aspects of mental states and consciousness in general in terms of third-person quantitative neuroscience is called the explanatory gap. There are several different views of the nature of this gap among contemporary philosophers of mind.
David Chalmers David John Chalmers (; born 20 April 1966) is an Australian Australians, colloquially referred to as "Aussies", are the citizens Citizenship is a relationship between an individual and a state to which the individual owes allegiance ...

David Chalmers
and the early Frank Cameron Jackson, Frank Jackson interpret the gap as
ontological Ontology is the branch of philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, Metaphysics, existence, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Ph ...

ontological
in nature; that is, they maintain that qualia can never be explained by science because physicalism is false. There are two separate categories involved and one cannot be reduced to the other. An alternative view is taken by philosophers such as Thomas Nagel and Colin McGinn. According to them, the gap is epistemology, epistemological in nature. For Nagel, science is not yet able to explain subjective experience because it has not yet arrived at the level or kind of knowledge that is required. We are not even able to formulate the problem coherently. For McGinn, on other hand, the problem is one of permanent and inherent biological limitations. We are not able to resolve the explanatory gap because the realm of subjective experiences is cognitively closed to us in the same manner that quantum physics is cognitively closed to elephants. Other philosophers liquidate the gap as purely a semantic problem. This semantic problem, of course, led to the famous "''Qualia Question''", which is: ''Does Red cause Redness''?


Intentionality

Intentionality is the capacity of mental states to be directed towards (''about'') or be in relation with something in the external world. This property of mental states entails that they have mental content, contents and semantics, semantic referents and can therefore be assigned truth values. When one tries to reduce these states to natural processes there arises a problem: natural processes are not true or false, they simply happen. It would not make any sense to say that a natural process is true or false. But mental ideas or judgments are true or false, so how then can mental states (ideas or judgments) be natural processes? The possibility of assigning semantic value to ideas must mean that such ideas are about facts. Thus, for example, the idea that Herodotus was a historian refers to Herodotus and to the fact that he was a historian. If the fact is true, then the idea is true; otherwise, it is false. But where does this relation come from? In the brain, there are only electrochemical processes and these seem not to have anything to do with Herodotus.


Philosophy of perception

Philosophy of perception is concerned with the nature of Perception, perceptual experience and the status of perceptual objects, in particular how perceptual experience relates to appearances and beliefs about the world. The main contemporary views within philosophy of perception include naive realism, enactivism and Mental representation, representational views.


Philosophy of mind and science

Humans are corporeal beings and, as such, they are subject to examination and description by the natural sciences. Since mental processes are intimately related to bodily processes, the descriptions that the natural sciences furnish of human beings play an important role in the philosophy of mind. There are many scientific disciplines that study processes related to the mental. The list of such sciences includes: biology,
computer science Computer science deals with the theoretical foundations of information, algorithms and the architectures of its computation as well as practical techniques for their application. Computer science is the study of computation, automation, a ...
, cognitive science, cybernetics, linguistics, medicine, pharmacology, and psychology.Pinker, S. (1997) ''How the Mind Works''. tr. It: ''Come Funziona la Mente''. Milan:Mondadori, 2000.


Neurobiology

The theoretical background of biology, as is the case with modern natural sciences in general, is fundamentally materialistic. The objects of study are, in the first place, physical processes, which are considered to be the foundations of mental activity and behavior.Bear, M. F. et al. Eds. (1995). ''Neuroscience: Exploring The Brain''. Baltimore, Maryland, Williams and Wilkins. The increasing success of biology in the explanation of mental phenomena can be seen by the absence of any empirical refutation of its fundamental presupposition: "there can be no change in the mental states of a person without a change in brain states." Within the field of neurobiology, there are many subdisciplines that are concerned with the relations between mental and physical states and processes: Neurophysiology, Sensory neurophysiology investigates the relation between the processes of perception and stimulation. Cognitive neuroscience studies the correlations between mental processes and neural processes. Neuropsychology describes the dependence of mental faculties on specific anatomical regions of the brain. Lastly, evolutionary biology studies the origins and development of the human nervous system and, in as much as this is the basis of the mind, also describes the ontogenesis, ontogenetic and phylogenesis, phylogenetic development of mental phenomena beginning from their most primitive stages. Evolutionary biology furthermore places tight constraints on any philosophical theory of the mind, as the gene-based mechanism of natural selection does not allow any giant leaps in the development of neural complexity or neural software but only incremental steps over long time periods. The methodology, methodological breakthroughs of the neurosciences, in particular the introduction of high-tech neuroimaging procedures, has propelled scientists toward the elaboration of increasingly ambitious research programs: one of the main goals is to describe and comprehend the neural processes which correspond to mental functions (see: neural correlate). Several groups are inspired by these advances.


Computer science

Computer science concerns itself with the automatic processing of information (or at least with physical systems of symbols to which information is assigned) by means of such things as computers. From the beginning, computer programmers have been able to develop programs that permit computers to carry out tasks for which organic beings need a mind. A simple example is multiplication. It is not clear whether computers could be said to have a mind. Could they, someday, come to have what we call a mind? This question has been propelled into the forefront of much philosophical debate because of investigations in the field of
artificial intelligence Artificial intelligence (AI) is intelligence Intelligence has been defined in many ways: the capacity for abstraction Abstraction in its main sense is a conceptual process where general rules and concept Concepts are defined as abstra ...

artificial intelligence
(AI). Within AI, it is common to distinguish between a modest research program and a more ambitious one: this distinction was coined by John Searle in terms of a philosophy of artificial intelligence#Strong AI vs. weak AI, weak AI and strong AI. The exclusive objective of "weak AI", according to Searle, is the successful simulation of mental states, with no attempt to make computers become conscious or aware, etc. The objective of strong AI, on the contrary, is a computer with consciousness similar to that of human beings. The program of strong AI goes back to one of the pioneers of computation Alan Turing. As an answer to the question "Can computers think?", he formulated the famous Turing test. Turing believed that a computer could be said to "think" when, if placed in a room by itself next to another room that contained a human being and with the same questions being asked of both the computer and the human being by a third party human being, the computer's responses turned out to be indistinguishable from those of the human. Essentially, Turing's view of machine intelligence followed the behaviourist model of the mind—intelligence is as intelligence does. The Turing test has received many criticisms, among which the most famous is probably the Chinese room
thought experiment A thought experiment is a hypothetical situation in which a hypothesis A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can t ...
formulated by Searle. The question about the possible sensitivity (
qualia In philosophy of mind Philosophy of mind is a branch of that studies the and nature of the and its relationship with the body. The is a paradigmatic issue in philosophy of mind, although a number of other issues are addressed, such as the ...
) of computers or robots still remains open. Some computer scientists believe that the specialty of AI can still make new contributions to the resolution of the "mind–body problem". They suggest that based on the reciprocal influences between software and hardware that takes place in all computers, it is possible that someday theories can be discovered that help us to understand the reciprocal influences between the human mind and the brain (wetware (brain), wetware).


Psychology

Psychology is the science that investigates mental states directly. It uses generally empirical methods to investigate concrete mental states like joy, fear or Obsessive–compulsive disorder, obsessions. Psychology investigates the laws that bind these mental states to each other or with inputs and outputs to the human organism. An example of this is the Perception, psychology of perception. Scientists working in this field have discovered general principles of the Form perception, perception of forms. A law of the psychology of forms says that objects that move in the same direction are perceived as related to each other. This law describes a relation between visual input and mental perceptual states. However, it does not suggest anything about the nature of perceptual states. The laws discovered by psychology are compatible with all the answers to the mind–body problem already described.


Cognitive science

Cognitive science is the interdisciplinary scientific study of the mind and its processes. It examines what cognition is, what it does, and how it works. It includes research on intelligence and behavior, especially focusing on how information is represented, processed, and transformed (in faculties such as perception, language, memory, reasoning, and emotion) within nervous systems (human or other animal) and machines (e.g. computers). Cognitive science consists of multiple research disciplines, including psychology,
artificial intelligence Artificial intelligence (AI) is intelligence Intelligence has been defined in many ways: the capacity for abstraction Abstraction in its main sense is a conceptual process where general rules and concept Concepts are defined as abstra ...

artificial intelligence
,
philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about Metaphysics, existence, reason, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Philosophy of language, language. Such questio ...

philosophy
,
neuroscience Neuroscience is the scientific study of the nervous system In biology, the classical doctrine of the nervous system determines that it is a Complex system, highly complex part of an animal that coordinates its Behavior, actions and Sens ...

neuroscience
, linguistics, anthropology, sociology, and education. It spans many levels of analysis, from low-level learning and decision mechanisms to high-level logic and planning; from neural circuitry to modular brain organisation. Mark Rowlands, Rowlands argues that cognition is enactive, embodied, embedded, affective and (potentially) extended. The position is taken that the "classical sandwich" of cognition sandwiched between perception and action is artificial; cognition has to be seen as a product of a strongly coupled interaction that cannot be divided this way.On-line version here
.


Near-death research

In the field of near-death research, the following phenomenon, among others, occurs: For example, during some brain operations the brain is artificially and measurably deactivated. Nevertheless, some patients report during this phase that they have perceived what is happening in their surroundings, i.e. that they have had consciousness. Patients also report experiences during a cardiac arrest. There is the following problem: As soon as the brain is no longer supplied with blood and thus with oxygen after a cardiac arrest, the brain ceases its normal operation after about 15 seconds, i.e. the brain falls into a state of unconsciousness.J. M. Luce: ''Chronic disorders of consciousness following coma: Part one: medical issues.'' In: ''Chest.'' Band 144, Nummer 4, Oktober 2013, S. 1381–1387, doi:10.1378/chest.13-0395, (Review).


Philosophy of mind in the continental tradition

Most of the discussion in this article has focused on one style or tradition of philosophy in modern Western culture, usually called analytic philosophy (sometimes described as Anglo-American philosophy). Many other schools of thought exist, however, which are sometimes subsumed under the broad (and vague) label of continental philosophy. In any case, though topics and methods here are numerous, in relation to the philosophy of mind the various schools that fall under this label (Phenomenology (philosophy), phenomenology, existentialism, etc.) can globally be seen to differ from the analytic school in that they focus less on language and logical analysis alone but also take in other forms of understanding human existence and experience. With reference specifically to the discussion of the mind, this tends to translate into attempts to grasp the concepts of thought and experience, perceptual experience in some sense that does not merely involve the analysis of linguistic forms. Immanuel Kant's ''Critique of Pure Reason'', first published in 1781 and presented again with major revisions in 1787, represents a significant intervention into what will later become known as the philosophy of mind. Kant's first critique is generally recognized as among the most significant works of modern philosophy in the West. Kant is a figure whose influence is marked in both Continental philosophy, continental and analytic/Anglo-American philosophy. Kant's work develops an in-depth study of Transcendental idealism, transcendental consciousness, or the life of the mind as conceived through the universal category (Kant), categories of understanding. In Georg Wilhelm Friedrich Hegel's ''Philosophy of Mind'' (frequently translated as ''Philosophy of Spirit'' or Geist), the third part of his ''Encyclopedia of the Philosophical Sciences'', Hegel discusses three distinct types of mind: the "subjective mind/spirit", the mind of an individual; the "objective mind/spirit", the mind of society and of the State; and the "Absolute mind/spirit", the position of religion, art, and philosophy. See also Hegel's ''The Phenomenology of Spirit''. Nonetheless, Hegel's work differs radically from the style of Anglosphere, Anglo-American philosophy of mind. In 1896, Henri Bergson made in ''Matter and Memory'' "Essay on the relation of body and spirit" a forceful case for the ontological difference of body and mind by reducing the problem to the more definite one of memory, thus allowing for a solution built on the ''empirical test case'' of aphasia. In modern times, the two main schools that have developed in response or opposition to this Hegelian tradition are phenomenology and existentialism. Phenomenology, founded by Edmund Husserl, focuses on the contents of the human mind (see noema) and how processes shape our experiences. Existentialism, a school of thought founded upon the work of Søren Kierkegaard, focuses on Human predicament and how people deal with the situation of being alive. Existential-phenomenology represents a major branch of continental philosophy (they are not contradictory), rooted in the work of Husserl but expressed in its fullest forms in the work of Martin Heidegger, Jean-Paul Sartre, Simone de Beauvoir and Maurice Merleau-Ponty. See Heidegger's ''Being and Time'', Merleau-Ponty's ''Phenomenology of Perception'', Sartre's ''Being and Nothingness'', and Simone de Beauvoir's ''The Second Sex''.


Topics related to philosophy of mind

There are countless subjects that are affected by the ideas developed in the philosophy of mind. Clear examples of this are the nature of death and its definitive character, the nature of emotion, of perception and of memory. Questions about what a person is and what his or her Personal identity, identity have to do with the philosophy of mind. There are two subjects that, in connection with the philosophy of the mind, have aroused special attention: free will and the self (philosophy), self.


Free will

In the context of philosophy of mind, the problem of free will takes on renewed intensity. This is the case for materialistic determinism, determinists. According to this position, natural laws completely determine the course of the material world. Mental states, and therefore the will as well, would be material states, which means human behavior and decisions would be completely determined by natural laws. Some take this reasoning a step further: people cannot determine by themselves what they want and what they do. Consequently, they are not free. This argumentation is rejected, on the one hand, by the compatibilism, compatibilists. Those who adopt this position suggest that the question "Are we free?" can only be answered once we have determined what the term "free" means. The opposite of "free" is not "caused" but "compelled" or "coerced". It is not appropriate to identify freedom with indetermination. A free act is one where the agent could have done otherwise if it had chosen otherwise. In this sense a person can be free even though determinism is true. The most important compatibilist in the history of the philosophy was David Hume. More recently, this position is defended, for example, by Daniel Dennett. On the other hand, there are also many incompatibilism, incompatibilists who reject the argument because they believe that the will is free in a stronger sense called Libertarianism (metaphysics), libertarianism. These philosophers affirm the course of the world is either a) not completely determined by natural law where natural law is intercepted by physically independent agency, b) determined by indeterministic natural law only, or c) determined by indeterministic natural law in line with the subjective effort of physically non-reducible agency. Under Libertarianism, the will does not have to be deterministic and, therefore, it is potentially free. Critics of the second proposition (b) accuse the incompatibilists of using an incoherent concept of freedom. They argue as follows: if our will is not determined by anything, then we desire what we desire by pure chance. And if what we desire is purely accidental, we are not free. So if our will is not determined by anything, we are not free.


Self

The philosophy of mind also has important consequences for the concept of "self". If by "self" or "I" one refers to an essential, immutable nucleus of the ''person'', some modern philosophers of mind, such as Daniel Dennett believe that no such thing exists. According to Dennett and other contemporaries, the self is considered an illusion. The idea of a self as an immutable essential nucleus derives from the idea of an soul, immaterial soul. Such an idea is unacceptable to modern philosophers with physicalist orientations and their general skepticism of the concept of "self" as postulated by David Hume, who could never catch himself ''not'' doing, thinking or feeling anything. However, in the light of empirical results from developmental psychology, developmental biology and
neuroscience Neuroscience is the scientific study of the nervous system In biology, the classical doctrine of the nervous system determines that it is a Complex system, highly complex part of an animal that coordinates its Behavior, actions and Sens ...

neuroscience
, the idea of an essential inconstant, material nucleus—an integrated representational system distributed over changing patterns of synaptic connections—seems reasonable.


See also

* Animal consciousness * Artificial consciousness * Collective intentionality * Intension * Intention * Outline of human intelligence * Outline of thought * Theory of mind in animals


References


Further reading


The London Philosophy Study Guide
offers many suggestions on what to read, depending on the student's familiarity with the subject

* Richard Rorty, ''Philosophy and the Mirror of Nature'' (Princeton, 1980), p. 120, 125. * Pedro Jesús Teruel, ''Mente, cerebro y antropología en Kant'' (Madrid, 2008). . * David J. Ungs, ''Better than one; how we each have two minds'' (London, 2004). * Alfred North Whitehead ''Science and the Modern World'' (1925; reprinted London, 1985), pp. 68–70. * Edwin Burtt ''The Metaphysical Foundations of Modern Physical Science'', 2nd ed. (London, 1932), pp. 318–19. * Felix Deutsch (ed.) ''On the Mysterious Leap from the Mind to the Body'' (New York, 1959). * Herbert Feigl
The "Mental" and the "Physical": The Essay and a Postscript (1967)
', in H. Feigl et al., (eds.), ''Minnesota Studies in the Philosophy of Science'' (Minneapolis, 1958), Vol. 2, pp. 370–497, at p. 373. * Nap Mabaquiao, Jr.

(with foreword by Tim Crane). Manila: De La Salle University Publishing House, 2012. * Celia Green ''The Lost Cause: Causation and the Mind–Body Problem''. (Oxford: Oxford Forum, 2003). Applies a sceptical view on causality to the problems of interactionism. * Gyatso, Geshe Kelsang Gyatso, ''Understanding the Mind'': The Nature and Power of the Mind, Tharpa Publications (2nd. ed., 1997)
Gerhard Medicus. Being Human – Bridging the Gap between the Sciences of Body and Mind. Berlin (2015): VWB
*Scott Robert Sehon
Teleological Realism: Mind, Agency and Explanation
Cambridge: MIT University Press, 2005.


External links

* * *

compiled by David Chalmers.
MindPapers: A Bibliography of the Philosophy of Mind and the Science of Consciousness
compiled by David Chalmers (Editor) & David Bourget (Assistant Editor).
Dictionary of Philosophy of Mind
edited by Chris Eliasmith.
An Introduction to the Philosophy of Mind
by Paul Newall, aimed at beginners.

compiled by David Chalmers
Field guide to the Philosophy of Mind
from the Indian Psychology series by Swami Veda Bharati. {{DEFAULTSORT:Philosophy Of Mind Philosophy of mind, Abstraction Cognition Concepts in epistemology Concepts in metaphysics Consciousness Consciousness studies Dualism (philosophy of mind) Emergence Epistemological theories Idealism Mental content Metaphysical theories Metaphysics of mind Monism Nondualism Ontology Philosophical problems Philosophical theories Qualia Reasoning Thought