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Peduncular hallucinosis (PH) is a rare neurological phenomenon that causes vivid visual hallucinations that typically occur in dark environments and last for several minutes. Unlike some other kinds of hallucinations, the hallucinations that patients with PH experience are very realistic, and often involve people and environments that are ...
Closed-eye hallucination. Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause ...
Visual hallucinations in psychoses are reported to have physical properties similar to real perceptions. They are often life-sized, detailed, and solid, and are projected into the external world. They typically appear anchored in external space, just beyond the reach of individuals, or further away. They can have three-dimensional shapes, with ...
A separate but related phenomenon is a visual illusion, which is a distortion of a real external stimulus. Visual hallucinations are classified as simple or complex: Simple visual hallucinations (SVH) are also referred to as non-formed visual hallucinations and elementary visual hallucinations. These terms refer to lights, colors, geometric ...
A connection between age-related macular degeneration (AMD) and colored visual hallucinations has been presented. [6] Color vision signals travel through the parvocellular layers of the lateral geniculate nucleus (LGN), later transmitting down the color regions of the ventral visual pathway. [ 6 ]
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 ...
Prosopometamorphopsia is considered a face hallucination and is included under the umbrella of complex visual hallucinations. [7] Unlike other forms of hallucinations such as peduncular hallucinosis or Charles Bonnet syndrome , prosopometamorphopsia does not predominate at a particular time of day; it is a constant experience. [ 7 ]
Apulian pottery depicting Lycrugus of Thrace, an ancient Greek king driven mad by Dionysus [1]. Mental illness in ancient Rome was recognized in law as an issue of mental competence, and was diagnosed and treated in terms of ancient medical knowledge and philosophy, primarily Greek in origin, while at the same time popularly thought to have been caused by divine punishment, demonic spirits, or ...