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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 ...
Pseudohallucination. A pseudohallucination (from Ancient Greek: ψευδής (pseudḗs) "false, lying" + "hallucination") is an involuntary sensory experience vivid enough to be regarded as a hallucination, but which is recognised by the person experiencing it as being subjective and unreal. By contrast, a "true" hallucination is perceived as ...
The term illusion refers to a specific form of sensory distortion. Unlike a hallucination, which is a distortion in the absence of a stimulus, an illusion describes a misinterpretation of a true sensation. For example, hearing voices regardless of the environment would be a hallucination, whereas hearing voices in the sound of running water (or ...
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 ...
Mirage. Various kinds of mirages in one location taken over the course of six minutes, not shown in chronological order. [a] A mirage is a naturally-occurring optical phenomenon in which light rays bend via refraction to produce a displaced image of distant objects or the sky. [1] The word comes to English via the French (se) mirer, from the ...
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.
Aesthetic illusion is a type of mental absorption which describes a generally pleasurable cognitive state that is frequently triggered by various media or other artifacts. Recipients can be drawn into a represented world imaginatively, emotionally or, to some extent, rationally and experience the world, the characters and the story in a ...
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 ...