Illusions are misperceptions of external stimuli and are most likely to occur when the general level of sensory stimulation is reduced.
■ Hallucinations Healthy people occasionally experience hallucinations, such as innormal grief, or during the transition between sleeping and waking.its may affect any of the perceptions: auditory, visual, tactile, gustatory, olfactory or of deep sensation.
■ Pseudohallucinations are usually auditory, and are either true externally sited hallucinations, but with insight into their imaginary nature, or are sited within internal space (ex. ‘someone talk to me in my head’). They can occur in mood disorders and do not indicate apsychosis.
■ Depersonalization is a change in self-awareness such that the person feels unreal or detached from their body. The individual is aware, however, of the subjective nature of this alteration.
■ Derealization is the unpleasant feeling that the external environment has become unreal and/or remote; patients may describe themselves as though they are in adream-like state. Both this and depersonalization canoccur in healthy people when they are tired
■ Hallucinations Healthy people occasionally experience hallucinations, such as innormal grief, or during the transition between sleeping and waking.its may affect any of the perceptions: auditory, visual, tactile, gustatory, olfactory or of deep sensation.
■ Pseudohallucinations are usually auditory, and are either true externally sited hallucinations, but with insight into their imaginary nature, or are sited within internal space (ex. ‘someone talk to me in my head’). They can occur in mood disorders and do not indicate apsychosis.
■ Depersonalization is a change in self-awareness such that the person feels unreal or detached from their body. The individual is aware, however, of the subjective nature of this alteration.
■ Derealization is the unpleasant feeling that the external environment has become unreal and/or remote; patients may describe themselves as though they are in adream-like state. Both this and depersonalization canoccur in healthy people when they are tired
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