perceptionThe awareness of objects, qualities and relations that follow stimulation of peripheral sensory organs as distinct from awareness that results from memory.
Illusions
Perceptual misinterpretation of real external sensory experience. Often dictated by dominant affective state. e.g. anxiety which may lead to threatening disortion of visual experiences.
Hallucinations
Apparent perception of an external object when no real corresponding object exists. An internal psychological event is mistakenly attributed to an external source.
Any sensory modality may be involved may refer to external Surroundings or to bodily function. When caused by organic cause include hallucinogenic drugs, epilepsy, delirium due to toxic agents or alcohol , barbiturate withdrawal states. Psychogenic cause include schizophrenic psychosis which typically occurs in the setting of clear consciousness.
May be hypnogogic (preceding sleep) or hypnopompic (on waking).
Tags: Bodily function, Hypnogogic, Hypnopompic, Peripheral sensory organs