false sensory perception in the absence of a real external stimulus. It is perceived as being located in objective space and as having the same realistic qualities as normal perceptions. It is not subject to conscious manipulation and only indicates a psychotic disturbance when there is also impaired reality testing.
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A situation whereby a person experiences a sensory perception but there is no external stimulus. It can be associated with any of the senses but most often it is visual.
False or distorted perception of an image or sound with a compelling sense of reality
Seeing, hearing, feeling, tasting, or smelling something that doesn't really exist.