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Hallucinogen Persisting Perception Disorder
Hallucinogen persisting perception disorder (HPPD) is a non-psychotic disorder in which a person experiences apparent lasting or persistent visual hallucinations or perceptual distortions after using drugs, including but not limited to psychedelics, dissociatives, entactogens, tetrahydrocannabinol (THC), and SSRIs. Despite being designated as a hallucinogen-specific disorder, the specific contributory role of psychedelic drugs is unknown. The hallucinations and perceptual changes consist of, but are not limited to, visual snow, trails and after images (palinopsia), light fractals on flat surfaces, intensified colors, altered motion perception, pareidolia, micropsia, and macropsia. People who have never previously taken drugs have also reported some symptoms associated with HPPD (such as floaters and visual snow). HPPD is a DSM-5 diagnosis with diagnostic code 292.89 (F16.983). For the diagnosis to be made, other psychological, psychiatric, or neurological conditions must b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Visual Snow
Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is visual snow, a persistent flickering white, black, transparent, or colored dots across the whole visual field. It is distinct from the ''symptom'' of visual snow itself, which can also be caused by several other causes; these cases are referred to as "VSS mimics." Other names for the syndrome include "scotopic sensitivity syndrome", "Meares-Irlen syndrome", and "asfedia." Other common symptoms are palinopsia, enhanced entoptic phenomena, photophobia, and tension headaches. The condition is typically always present and has no known cure, as viable treatments are still under research. Astigmatism, although not presumed connected to these visual disturbances, is a common comorbidity. Migraines and tinnitus are common comorbidities that are both associated with a more severe presentation of the syndrome. The cause of the syndrome is unclear. The underlying mechanism is believed to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mescaline
Mescaline, also known as mescalin or mezcalin, and in chemical terms 3,4,5-trimethoxyphenethylamine, is a natural product, naturally occurring psychedelic drug, psychedelic alkaloid, protoalkaloid of the substituted phenethylamine class, found in Cactus, cacti like peyote (''Lophophora williamsii'') and San Pedro cactus, San Pedro (certain species of the Echinopsis genus) and known for its Serotonin, serotonergic Hallucinogen, hallucinogenic effects. Mescaline is typically taken orally and used recreationally, spiritually, and medically, with psychedelic effects occurring at doses from 100 to 1,000 mg, including microdosing below 75 mg, and it can be consumed in pure form or via mescaline-containing cacti. Mescaline induces a psychedelic experience characterized by vivid visual patterns, altered perception of time and self, synesthesia, and spiritual effects, with an onset of 0.5–0.9 hours and a duration that increases with dose, ranging from about 6 to 14 hours. Mescaline h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ergine
Ergine, also known as lysergic acid amide (LSA or LAA) as well as LA-111, is a psychoactive compound of the ergoline and lysergamide families related to lysergic acid diethylamide (LSD). Ergine is an ergoline alkaloid found in fungi such as '' Claviceps paspali'' (ergot) and '' Periglandula'' species such as '' Periglandula clandestina'', which are permanently connected with many morning glory vines. Ergine induces relatively mild psychedelic effects as well as pronounced sedative effects. The most common sources of ergine for use as a drug are the seeds of morning glory species including ''Ipomoea tricolor'' (tlitliltzin), '' Ipomoea corymbosa'' (ololiuhqui), and '' Argyreia nervosa'' (Hawaiian baby woodrose). Morning glory seeds have a history of entheogenic use in Mesoamerica dating back at least hundreds of years. They have also since been used by many Westerners. In addition to ergine, morning glory seeds contain other ergolines such as lysergic acid hydroxyethylamid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lysergamides
Lysergamides, also known as ergoamides or as lysergic acid amides, are amides of lysergic acid (LA). They are ergolines, with some lysergamides being found natural product, naturally in ergot as well as other fungi. Lysergamides are notable in containing embedded substituted phenethylamine, phenethylamine and substituted tryptamine, tryptamine moiety (chemistry), moieties within their ergoline ring system (chemistry), ring system. The simplest lysergamides are ergine (lysergic acid amide; LSA) and isoergine (iso-lysergic acid amide; iso-LSA). In terms of pharmacology, the lysergamides include numerous serotonin and dopamine receptor (biochemistry), receptor agonists, most notably the psychedelic drug lysergic acid diethylamide (LSD) but also a number of pharmaceutical drugs like ergometrine, methylergometrine, methysergide, and cabergoline. Various analogues of LSD, such as the psychedelics ALD-52 (1A-LSD), ETH-LAD, LSZ, and 1P-LSD and the non-hallucinogenic 2-bromo-LSD (BOL-148) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citations Needed
A citation is a reference to a source. More precisely, a citation is an abbreviated alphanumeric expression embedded in the body of an intellectual work that denotes an entry in the bibliographic references section of the work for the purpose of acknowledging the relevance of the works of others to the topic of discussion at the spot where the citation appears. Generally, the combination of both the in-body citation and the bibliographic entry constitutes what is commonly thought of as a citation (whereas bibliographic entries by themselves are not). Citations have several important purposes. While their uses for upholding intellectual honesty and bolstering claims are typically foregrounded in teaching materials and style guides (e.g.,), correct attribution of insights to previous sources is just one of these purposes. Linguistic analysis of citation-practices has indicated that they also serve critical roles in orchestrating the state of knowledge on a particular topic, ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tinnitus
Tinnitus is a condition when a person hears a ringing sound or a different variety of sound when no corresponding external sound is present and other people cannot hear it. Nearly everyone experiences faint "normal tinnitus" in a completely quiet room; but this is of concern only if it is bothersome, interferes with normal hearing, or is associated with other problems. The word ''tinnitus'' comes from the Latin language, Latin ''wikt:en:tinnitus#Latin, tinnire'', "to ring." In some people, it interferes with concentration, and can be associated with anxiety and Depression (mood), depression. Tinnitus is usually associated with hearing loss and decreased comprehension of speech in noisy environments. It is common, affecting about 10–15% of people. Most tolerate it well, and it is a significant (severe) problem in only 1–2% of people. It can trigger a fight-or-flight response, as the brain may perceive it as dangerous and important. Rather than a disease, tinnitus is a sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afterimage
An afterimage, or after-image, is an image that continues to appear in the eyes after a period of exposure to the original image. An afterimage may be a normal phenomenon (physiological afterimage) or may be pathological (palinopsia). Illusory palinopsia may be a pathological exaggeration of physiological afterimages. Afterimages occur because Photochemistry, photochemical activity in the retina continues even when the eyes are no longer experiencing the original stimulus. The remainder of this article refers to physiological afterimages. A common physiological afterimage is the dim area that seems to float before one's human eye, eyes after briefly looking into a light source, such as a camera flash. Palinopsia is a common symptom of visual snow. Negative afterimages Negative image, Negative afterimages are generated in the retina but may be modified like other retinal signals by neural adaptation of the retinal ganglion cells that carry signals from the retina of the eye to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Field Entoptic Phenomenon
The blue field entoptic phenomenon is an entoptic phenomenon characterized by the appearance of tiny bright dots (nicknamed blue-sky sprites) moving quickly along undulating pathways in the visual field, especially when looking into bright blue light such as the sky. The dots are short-lived, visible for about one second or less, and travel short distances along seemingly random, undulating paths. Some of them seem to follow the same path as other dots before them. The dots may appear elongated along the path, like tiny worms. The dots' rate of travel appears to vary in synchrony with the heartbeat: they briefly accelerate at each beat. The dots appear in the central field of view, within 15 degrees from the fixation point. The left and right eye see different, seemingly random, dot patterns; a person viewing through both eyes sees a combination of both left and right visual field disturbances. While seeing the phenomenon, lightly pressing inward on the sides of the eyeballs at th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypnopompic
Hypnopompia (also known as hypnopompic state) is the state of consciousness leading out of sleep, a term coined by the psychical researcher Frederic William Henry Myers, Frederic Myers. Its mirror is the hypnagogic state at sleep onset; though often conflated, the two states are not identical and have a different Phenomenology (philosophy), phenomenological character. Hypnopompic and hypnagogic hallucinations are frequently accompanied by sleep paralysis, which is a state wherein one is consciously aware of one's surroundings but unable to move or speak. Etymology Frederic William Henry Myers, Frederic Myers coined the term "hypnopompic", with its word-ending originating from the Greek word "pompos", meaning "sender", in 1904. Previously, in 1848, Alfred Maury introduced the term "hypnagogic" from the Greek words ύπνος (“hypnos”), meaning “sleep”, and αγωγός (“agōgos”), meaning “conductor” or “leader”. Hallucinations Hallucinations are common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypnagogia
Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. Its corresponding state is '' hypnopompia'' sleep to wakefulness. Mental phenomena that may occur during this "threshold consciousness" include hallucinations, lucid dreaming, and sleep paralysis. Etymology In 1848, Alfred Maury introduced the term "hypnagogic" from the Greek words ύπνος (“hypnos”), meaning “sleep”, and αγωγός (“agōgos”), meaning “conductor” or “leader”. Later, in 1904, Frederic Myers coined the term "hypnopompic," with its word-ending originating from the Greek word "pompos," meaning "sender." Definitions The word ''hypnagogia'' is sometimes used in a restricted sense to refer to the onset of sleep, and contrasted with '' hypnopompia'', Frederic Myers's term for waking up. However, ''hypnagogia'' is also regularly employed in a more general sense that covers both falling asleep and wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Color Blindness
Color blindness, color vision deficiency (CVD) or color deficiency is the decreased ability to color vision, see color or differences in color. The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually a Sex linkage, sex-linked Heredity, inherited problem or variation in the functionality of one or more of the three classes of cone cells in the retina, which mediate color vision. The most common form is caused by a genetic condition called congenital red–green color blindness (including protan and deutan types), which affects ''up to'' 1 in 12 males (8%) and 1 in 200 females (0.5%). The condition is more prevalent in males, because the opsin genes responsible are located on the X chromosome. Rarer genetic conditions causing color blindness include congenital blue–yellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. Color blindness can also result from physical or chemical dam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Illusory Palinopsia
Illusory palinopsia is a subtype of palinopsia, a visual disturbance defined as the persistence or recurrence of a visual image after the stimulus has been removed. Palinopsia is a broad term describing a heterogeneous group of symptoms, which is divided into hallucinatory palinopsia and illusory palinopsia. Illusory palinopsia is likely due to sustained awareness of a stimulus and is similar to a visual illusion: the distorted perception of a real external stimulus. Illusory palinopsia is caused by migraines, hallucinogen persisting perception disorder (HPPD), prescription drugs, and head trauma, but is also sometimes idiopathic. Illusory palinopsia consists of afterimages that are short-lived or unformed, occur at the same location in the visual field as the original stimulus, and are often exposed or exacerbated based on environmental parameters such as stimulus intensity, background contrast, fixation, and movement. Illusory palinopsia symptoms occur continuously or predi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
