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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 ...
An auditory hallucination, or paracusia, [1] is a form of hallucination that involves perceiving sounds without ... The causes of auditory hallucinations are unclear.
Tactile hallucination is the false perception of tactile sensory input that creates a hallucinatory sensation of physical ... The causes of RLS are generally unknown ...
Musical hallucinations can occur in people who are physically and mentally healthy, and for them, there is no known cause. [7] Most people find their musical hallucinations obtrusive, and wish to be rid of them, while others welcome them. In addition, investigators have pointed to factors that are associated with musical hallucinations.
Hallucinations may command a person to do something potentially dangerous when combined with delusions. [19] So-called "minor hallucinations", such as extracampine hallucinations, or false perceptions of people or movement occurring outside of one's visual field, frequently occur in neurocognitive disorders, such as Parkinson's disease. [20]
It is only delusion that has serious psychiatric implications. The content of hallucinations is widely variable and can range from simple images including flashing or steady spots, colored lines and shapes (unformed hallucinations) to vivid objects, flowers, animals and persons (formed hallucinations).
His hallucinations consisted of perceptions of men, women, birds, carriages, buildings, tapestries, physically impossible circumstances and scaffolding patterns. [ 7 ] [ 16 ] Even though his health was in good shape and he had an absence of any psychiatric disorders, the source of the hallucinations remained unknown. [ 6 ]
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 entirely real by the ...