Mental operations are operations that affect
mental contents. Initially, operations of
reasoning
Reason is the capacity of consciously applying logic by drawing conclusions from new or existing information, with the aim of seeking the truth. It is closely associated with such characteristically human activities as philosophy, science, lang ...
have been the object of
logic
Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premis ...
alone.
Pierre Janet
Pierre Marie Félix Janet (; 30 May 1859 – 24 February 1947) was a pioneering French psychologist, physician, philosopher, and psychotherapist in the field of dissociation and traumatic memory.
He is ranked alongside William James an ...
was one of the first to use the concept in psychology. Mental operations have been investigated at a developmental level by
Jean Piaget
Jean William Fritz Piaget (, , ; 9 August 1896 – 16 September 1980) was a Swiss psychologist known for his work on child development. Piaget's theory of cognitive development and epistemological view are together called "genetic epistemology ...
, and from a
psychometric
Psychometrics is a field of study within psychology concerned with the theory and technique of measurement. Psychometrics generally refers to specialized fields within psychology and education devoted to testing, measurement, assessment, and ...
perspective by
J. P. Guilford. There is also a cognitive approach to the subject, as well as a systems view of it.
History
Since
Antiquity, mental operations, more precisely, formal operations of
reasoning
Reason is the capacity of consciously applying logic by drawing conclusions from new or existing information, with the aim of seeking the truth. It is closely associated with such characteristically human activities as philosophy, science, lang ...
have been the object of
logic
Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premis ...
.
Hobhouse, LT
Leonard Trelawny Hobhouse, FBA (8 September 1864 – 21 June 1929) was an English liberal political theorist and sociologist, who has been considered one of the leading and earliest proponents of social liberalism. His works, culminating ...
(2005). ''The Theory of Knowledge: A Contribution to Some Problems of Logic and Metaphysics'', Kessinger Publishing, p. 223. .
In 1903, Pierre Janet described two types of mental operations:
[Valsiner, Jaan; van der Veer, René (2000). ''The social mind: construction of the idea.'' Cambridge University Press, pp. 103-106. .]
* reality operations - mental operations under the control of logic;
* disinterested operations - escaping the control of reason.
Jean Piaget differentiated a
preoperational stage, and operational stages of
cognitive development
Cognitive development is a field of study in neuroscience and psychology focusing on a child's development in terms of information processing, conceptual resources, perceptual skill, language learning, and other aspects of the developed adult bra ...
, on the basis of presence of mental operations as an
adaptation tool.
[Ginsburg, Herbert; Opper, Sylvia (1979). ''Piaget's Theory of Intellectual Development.'' Prentice Hall, p. 152. .]
J. P. Guilford's Structure of Intellect model described up to 180 different intellectual abilities organized along three dimensions—Operations, Content, and Products.
[Guilford, Joy Paul (1980). Some changes in the structure of intellect model. ''Educational and Psychological Measurement'' 48: 1-4.]
Logical view
According to
most logicians, the three primary mental operations are
apprehension (understanding),
judgement, and
inference
Inferences are steps in reasoning, moving from premises to logical consequences; etymologically, the word '' infer'' means to "carry forward". Inference is theoretically traditionally divided into deduction and induction, a distinction that ...
.
Apprehension
Apprehension is the mental operation by which an idea is formed in the mind. If you were to think of a sunset or a baseball, the action of forming that picture in your mind is apprehension. The verbal expression of apprehension is called a term.
Judgment
Judgment is the mental operation by which we predicate something of a subject. Were you to think, "That sunset is beautiful" or "Baseball is the all-American sport" is to make a judgment. The verbal expression of judgment is the statement (or proposition).
Inference
Inference (or reasoning) is the mental operation by which we draw conclusions from other information. If you were to think, "I like to look at that sunset, because I enjoy beautiful things, and that sunset is beautiful" you would be reasoning. The verbal expression of reasoning is the logical argument.
Developmental view
Jean Piaget
Jean William Fritz Piaget (, , ; 9 August 1896 – 16 September 1980) was a Swiss psychologist known for his work on child development. Piaget's theory of cognitive development and epistemological view are together called "genetic epistemology ...
identifies several mental operations of the
concrete operational stage of
cognitive development
Cognitive development is a field of study in neuroscience and psychology focusing on a child's development in terms of information processing, conceptual resources, perceptual skill, language learning, and other aspects of the developed adult bra ...
:

*''Seriation''—the ability to sort objects in an order according to size, shape, or any other characteristic. For example, if given different-shaded objects they may make a color gradient.
*''Transitivity''—The ability to recognize logical relationships among elements in a serial order, and perform 'transitive inferences' (for example, If A is taller than B, and B is taller than C, then A must be taller than C).
*''Classification''—the ability to name and identify sets of objects according to appearance, size or other characteristic, including the idea that one set of objects can include another.
*''Decentering''—where the child takes into account multiple aspects of a problem to solve it. For example, the child will no longer perceive an exceptionally wide but short cup to contain less than a normally-wide, taller cup.
*''Reversibility''—the child understands that numbers or objects can be changed, then returned to their original state. For this reason, a child will be able to rapidly determine that if 4+4 equals t, t−4 will equal 4, the original quantity.
*''Conservation''—understanding that quantity, length or number of items is unrelated to the arrangement or appearance of the object or items.
Piaget also describes a
formal operational stage, with formal operations of
abstract thinking: hypothesizing,
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 testable, test it. Scientists generally base scientific hypotheses on prev ...
testing, and
deduction.
Psychometric view

According to
J. P. Guilford's Structure of Intellect (SI) theory, an individual's performance on intelligence tests can be traced back to the underlying mental abilities or factors of intelligence. SI theory comprises multiple intellectual abilities organized along three dimensions—Operations, Content, and Products.
[Guilford, Joy Paul (1950). Creativity. ''American Psychologist'' 5 (9): 444-454.]
*''Operations dimension''
SI includes six operations or general intellectual processes:
Cognition—The ability to understand, comprehend, discover, and become aware of information.
Memory recording—The ability to encode information.
Memory retention—The ability to recall information.
Divergent production—The ability to generate multiple solutions to a problem; creativity.
Convergent production—The ability to deduce a single solution to a problem; rule-following or problem-solving.
Evaluation—The ability to judge whether or not information is accurate, consistent, or valid.
*''Content dimension''
SI includes five broad areas of information to which the human intellect applies the six operations:
Visual—Information perceived through seeing.
Auditory—Information perceived through hearing.
Kinesthetic -through actions
Symbolic—Information perceived as symbols or signs that have no meaning by themselves; e.g., Arabic numerals or the letters of an alphabet.
Semantic—Information perceived in words or sentences, whether oral, written, or silently in one's mind.
Behavioral—Information perceived as acts of people.
*''Product dimension''
As the name suggests, this dimension contains results of applying particular operations to specific contents. The SI model includes six products, in increasing complexity:
Units—Single items of knowledge.
Classes—Sets of units sharing common attributes.
Relations—Units linked as opposites or in associations, sequences, or analogies.
Systems—Multiple relations interrelated to comprise structures or networks.
Transformations—Changes, perspectives, conversions, or mutations to knowledge.
Implications—Predictions, inferences, consequences, or anticipations of knowledge.
Therefore, according to Guilford there are 6 x 5 x 6 = 180 intellectual abilities or factors. Each ability stands for a particular operation in a particular content area and results in a specific product, such as Comprehension of Figural Units or Evaluation of Semantic Implications.
Cognitive view

Following on the footsteps of Silvio Ceccato,
[Ceccato, Silvio (1961). ''Linguistic Analysis and Programming for Mechanical Translation''. G. Feltrinelli.] Giulio Benedetti describes several types of mental operations:
[Benedetti, Giulio (2005).]
"Basic mental operations which make up mental categories"
(PDF). ''www.mind-consciousness-language.com''
* attentional focalization - focusing
attention
Attention is the behavioral and cognitive process of selectively concentrating on a discrete aspect of information, whether considered subjective or objective, while ignoring other perceivable information. William James (1890) wrote that "Att ...
on something;
* attentional discarding - stopping our attention on an object;
* spatial basic operating scheme (attentional movement) - passing attention from one part to another of the attentional field;
* operation of
representation - evoking a mental image;
* operation of
comparison
Comparison or comparing is the act of evaluating two or more things by determining the relevant, comparable characteristics of each thing, and then determining which characteristics of each are similar to the other, which are different, and t ...
;
* operations of
memory
Memory is the faculty of the mind by which data or information is encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If past events could not be remembered ...
;
* temporal basic operating scheme - variation of attentional focalization.
Systems view

Taking into account all
mental process
Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of intellectual functions and processes such as: perception, attention, thought, ...
es, the following types of mental operations have been described:
[Tapu, Codrin Stefan (2001). ]
Hypostatic Personality: Psychopathology of Doing and Being Made
'. Premier, pp. 18-19. .
*
cognitive
Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of intellectual functions and processes such as: perception, attention, thought ...
operations - production and verbalization of images and thoughts;
* practical operations, pertaining to
executive functions
In cognitive science and neuropsychology, executive functions (collectively referred to as executive function and cognitive control) are a set of cognitive processes that are necessary for the cognitive control of behavior: selecting and succ ...
;
*
affective
Affect, in psychology, refers to the underlying experience of feeling, emotion or mood.
History
The modern conception of affect developed in the 19th century with Wilhelm Wundt. The word comes from the German ''Gefühl'', meaning "feeling."
...
operations - affective
evaluation
Evaluation is a
systematic determination and assessment of a subject's merit, worth and significance, using criteria governed by a set of standards. It can assist an organization, program, design, project or any other intervention or initiative ...
of the world and
self
The self is an individual as the object of that individual’s own reflective consciousness. Since the ''self'' is a reference by a subject to the same subject, this reference is necessarily subjective. The sense of having a self—or ''selfhood ...
;
* expressive operations (
emotional expression
An emotional expression is a behavior that communicates an emotional state or attitude. It can be verbal or nonverbal, and can occur with or without self-awareness. Emotional expressions include facial movements like smiling or scowling, simple ...
);
* perceptual-motor operations (e.g.,
eye-hand coordination);
* regulative operations - verbalization of needs, motives and feelings, and
self-control
Self-control, an aspect of inhibitory control, is the ability to regulate one's emotions, thoughts, and behavior in the face of temptations and impulses. As an executive function, it is a cognitive process that is necessary for regulating one' ...
.
See also
*
Logical connective
In logic, a logical connective (also called a logical operator, sentential connective, or sentential operator) is a logical constant. They can be used to connect logical formulas. For instance in the syntax of propositional logic, the binary ...
*
Mental event
A mental event is any event that happens within the mind of a conscious individual. Examples include thoughts, feelings, decisions, dreams, and realizations.
Some believe that mental events are not limited to human thought but can be associated ...
*
Mental process
Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of intellectual functions and processes such as: perception, attention, thought, ...
*
Mental rotation
Mental rotation is the ability to rotate mental representations of two-dimensional and three-dimensional objects as it is related to the visual representation of such rotation within the human mind. There is a relationship between areas of the b ...
References
{{Psychology
Cognitive science
Mental content