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A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. [4] Hallucination is a combination of two conscious states of brain: wakefulness and REM sleep. [5] They are distinguishable from several related phenomena, such as dreaming (REM sleep), which does not involve wakefulness ...
Hallucinogens are a large and diverse class of psychoactive drugs that can produce altered states of consciousness characterized by major alterations in thought, mood, and perception as well as other changes. [1][2] Most hallucinogens can be categorized as either being psychedelics, dissociatives, or deliriants.
An auditory hallucination, or paracusia, [1] is a form of hallucination that involves perceiving sounds without auditory stimulus. While experiencing an auditory hallucination, the affected person hears a sound or sounds that did not come from the natural environment. A common form of auditory hallucination involves hearing one or more voices ...
In the field of artificial intelligence (AI), a hallucination or artificial hallucination (also called bullshitting, [ 1 ][ 2 ]confabulation[ 3 ] or delusion[ 4 ]) is a response generated by AI that contains false or misleading information presented as fact. [ 5 ][ 6 ][ 7 ] This term draws a loose analogy with human psychology, where ...
Schizophrenia is a mental disorder [17][7] characterized by hallucinations (typically hearing voices), delusions, disorganized thinking and behavior, [10] and flat or inappropriate affect. [7] Symptoms develop gradually and typically begin during young adulthood and are never resolved. [3][10] There is no objective diagnostic test; diagnosis is ...
Apparitional experiences. A common type of anomalous experience is the apparitional experience, which may be defined as one in which a subject seems to perceive some person or thing that is not physically present. Self-selected samples tend to report a predominance of human figures, but apparitions of animals, [5] and even objects [6] are also ...
Formication, a type of tactile hallucination, is the feeling of imaginary insects or spiders on the skin. Tactile hallucination is the false perception of tactile sensory input that creates a hallucinatory sensation of physical contact with an imaginary object. [ 1 ] It is caused by the faulty integration of the tactile sensory neural signals ...
Psychosis is a condition of the mind or psyche that results in difficulties determining what is real and what is not real. [ 3 ] Symptoms may include delusions and hallucinations, among other features. [ 3 ] Additional symptoms are incoherent speech and behavior that is inappropriate for a given situation. [ 3 ]