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a sensory impression (sight, touch, sound, smell, or taste) that has no basis in external stimulation. Hallucinations can have psychologic causes, as in mental illness, or they can result from drugs, alcohol, organic illnesses, such as brain tumor or senility, or exhaustion. When hallucinations have a psychologic origin, they usually represent a disguised form of a repressed conflict. adj. adj hallu´cinative, hallu´cinatory.
auditory hallucination a hallucination of hearing; the most common type.
gustatory hallucination a hallucination of taste.
haptic hallucination tactile hallucination.
hypnagogic hallucination a vivid, dreamlike hallucination occurring at sleep onset.
hypnopompic hallucination a vivid, dreamlike hallucination occurring on awakening.
kinesthetic hallucination a hallucination involving the sense of bodily movement.
olfactory hallucination a hallucination of smell.
somatic hallucination a hallucination involving the perception of a physical experience occurring within the body.
tactile hallucination a hallucination of touch.
visual hallucination a hallucination of sight.
a symptom frequently a part of or a frequent symptom in a schizophrenic or psychotic mood disorder that, in the absence of an external source, consists of hearing a voice or other auditory stimulus that other people do not perceive.
auditory hallucinationA hallucination involving the perception of sounds arising from outside of the head, most commonly of voices, in absence of auditory stimuli, which may occur in absence of psychosis or mental illness.
Brainstem lesions—e.g., post-stroke, tumours, encephalitis, infection and abscesses.
au·di·to·ry hal·lu·ci·na·tion(awdi-tōr-ē hă-lūsi-nāshŭn)
Symptom commonly seen in a schizophrenic or psychotic mood disorder patients that, in the absence of an external source, consists of hearing a voice or other auditory stimulus that other people do not perceive.