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A pseudohallucination (from Ancient Greek: ψευδής (pseudḗs) ' false, lying ' + hallucination) is an involuntary sensory experience that is vivid enough to be perceived as a hallucination, but is recognised by the individual as subjective and lacking objective reality. [1]
A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. [6] They are distinguishable from several related phenomena, such as dreaming (), which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real ...
Hallucination is defined as visual perception without external stimulation. It must be distinguished whether the individual is able to recognize that the perception is not real, also called pseudo-hallucination, or that the individual endorses it as real, also called delusion. It is only delusion that has serious psychiatric implications.
The syndrome is commonly accompanied by frequent hallucinations, pseudohallucinations, and visual illusions. [5] Individuals with oneiroid syndrome typically recognise the perceived phenomena as belonging to alternate realms or dimensions inaccessible to ordinary people, rather than to the tangible, external world. [5]
Reflex hallucinations occur when true sensory input in one sense leads to production of a hallucination in another sense, e.g. seeing a doctor writing (visual) and then feeling him writing across one's stomach (tactile).
There is a species of fish that can cause hallucinations when eaten. As Atlas Obscura notes in a recent report, the fish was reportedly consumed by the Romans for its drug-like effects and by the ...
Stimulant psychosis is a mental disorder characterized by psychotic symptoms (such as hallucinations, paranoid ideation, delusions, disorganized thinking, grossly disorganized behaviour). It involves and typically occurs following an overdose or several day binge on psychostimulants , [ 1 ] although it can occur in the course of stimulant ...
Stendhal syndrome is a proposed condition in which someone experiences rapid heartbeat, fainting, confusion, and even hallucinations when exposed to works of beauty. [ 81 ] Stockholm syndrome is a proposed condition in which a hostage develops an emotional bond with their kidnapper while in captivity. [ 82 ]