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Pseudohallucination. A pseudohallucination (from Ancient Greek: ψευδής (pseudḗs) "false, lying" + "hallucination") is an involuntary sensory experience vivid enough to be regarded as a hallucination, but which is recognised by the person experiencing it as being subjective and unreal. By contrast, a "true" hallucination is perceived as ...
A visual simulation of HPPD, often referred to as visual snow. Hallucinogen persisting perception disorder (HPPD) is a non-psychotic disorder in which a person experiences apparent lasting or persistent visual hallucinations or perceptual distortions after using drugs, [1] including but not limited to psychedelics, dissociatives, entactogens ...
Musical hallucinations. Musical hallucinations (also known as auditory hallucinations, auditory Charles Bonnet Syndrome, and Oliver Sacks' syndrome [1]) describes a neurological disorder in which the patient will hallucinate songs, tunes, instruments and melodies. The source of these hallucinations are not correlated with psychotic illness. [2]
Psychosis, delirium, or dementia [1] Visual release hallucinations, also known as Charles Bonnet syndrome or CBS, are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations. First described by Charles Bonnet in 1760, [2][3] the term Charles Bonnet syndrome was first ...
The majority of hallucinations associated with paraphrenia are auditory, with 75% of patients reporting such an experience; however, visual, tactile, and olfactory hallucinations have also been reported. [1] [7] The paranoia and hallucinations can combine in the form of “threatening or accusatory voices coming from neighbouring houses [and ...
Parasomnia. Specialty. Sleep medicine, psychology. Parasomnias are a category of sleep disorders that involve abnormal movements, behaviors, emotions, perceptions, and dreams that occur while falling asleep, sleeping, between sleep stages, or during arousal from sleep. Parasomnias are dissociated sleep states which are partial arousals during ...
Psychiatry. Delusional misidentification syndrome is an umbrella term, introduced by Christodoulou (in his book The Delusional Misidentification Syndromes, Karger, Basel, 1986) for a group of four delusional disorders that occur in the context of mental and neurological illness. They are grouped together as they often occur simultaneously or ...
Hallucination is defined as visual perception without external stimulation. It must be distinguished whether the individual is able to recognize that the perception is not real, also called pseudo-hallucination, or that the individual endorses it as real, also called delusion. It is only delusion that has serious psychiatric implications.