Q. A sensory experience that occurs in the absence of any external percepetual stimulus
Solution:
Hallucinations are involuntary sensory experiences that are perceived as emanating from the external environ-ment, in the absence of stimulation of relevant sensory receptors. Hallucinations can occur in any sensory modality and can involve multiple modalities. Auditory hallucinations are the most common in schizophrenia and other illnesses that are traditionally termed psychiatric, and visual hallucinations are the most common in illnesses termed neurological.
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