- closed-eye hallucination
- Also known as closed-eye visual hallucination and closed-eye visualization. All three terms are used to denote a type of *visual hallucination experienced exclusively when the eyes are closed or when there is perfect darkness around. Some examples of phenomena classified as closed-eye hallucinations are * Eigengrau (i.e. a type of *visual noise), the *fiery rings of Purkinje, * hypnagogic and * hypnopompic hallucinations of a visual type, (some types of) * hallucinogen-induced * geometric hallucinations, and visual hallucinations occurring in the context of * sensory deprivation. Although Eigengrau and the fiery rings of Purkinje are classified more appropriately as *physiological illusions or * entoptic phenomena, they are commonly included in the group of closed-eye hallucinations as well. As to the pathophysiology of closed-eye hallucinations, a certain analogy has been suggested with the * Charles Bonnet syndrome, which is characterized by the occurrence of visual hallucinations in individuals with visual impairment. However, this analogy is debatable, if only because visual hallucinations occurring in the context of Charles Bonnet syndrome tend to come and go, whereas closed-eye hallucinations are often described as arising immediately upon eye closure, and lasting continuously until the eyes are opened. And yet in both cases the hallucinations at hand would seem to constitute * release phenomena. The notion of closed-eye hallucination should not be confused with the notions of * dream and * nightmare, or with the notion of * crepuscular hallucosis, which is reserved for hallucinatory states typically arising in halflight. Neither should it be confused with the * monocular hallucination, which can be stopped rather than provoked by the closing of an eye.ReferencesEissa, A., Baker, R.A., Knight, J.L. (2005). Closed-eye visual hallucinations after coronary artery bypass grafting. Journal of Cardio-thoracic and Vascular Anesthesia, 19, 217-219.
Dictionary of Hallucinations. J.D. Blom. 2010.
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Closed-eye hallucination — Closed eye hallucinations and closed eye visualizations (CEV) are a distinct class of hallucination. These types of hallucinations generally only occur when one s eyes are closed or when one is in a darkened room. They are a form of phosphene.… … Wikipedia
closed-eye visual hallucination — see closed eye hallucination … Dictionary of Hallucinations
closed-eye visualization — see closed eye hallucination … Dictionary of Hallucinations
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monocular hallucination — Also known as monocular complex hallucination. Both terms are indebted to the Greek monos (only) and the Latin oculus (eye). The term monocular hallucination was introduced in or shortly before 1936 by the Swiss neurologist Georges de Morsier… … Dictionary of Hallucinations
hypnagogic hallucination — Also known as hypnagogic imagery, hypnagogic reverie, hypnagogic illusion, hypnagogic visualization, presomnal sensation, predormital hallucination, anthypnic sensation, oneirogagic image, phantasma, vision of half sleep, and faces in the dark … Dictionary of Hallucinations
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