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Visual hallucinations in psychosis is when a subject with psychosis endures visual experiences which occur in the absence of corresponding external stimulation of the eye in the awake state, in which the subjects do not feel like they have control over, with sufficient sense of reality to resemble a authentic visual perception.
A shadow person (also known as a shadow figure or black mass) is the perception of shadow as a living species, humanoid figure, sometimes interpreted as the presence of a spirit or other entity by believers in the paranormal or supernatural.
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 stimulates the eye.
A shadow person (also known as a shadow figure, shadow being or black mass) is often attributed to pareidolia. It is the perception of a patch of shadow as a living, humanoid figure, particularly as interpreted by believers in the paranormal or supernatural as the presence of a spirit or other entity. [68]
Illusory palinopsia is often worse with high stimulus intensity and contrast ratio in a dark adapted state.Multiple types of illusory palinopsia often co-exist in a patient and occur with other diffuse, persistent illusory symptoms such as halos around objects, dysmetropsia (micropsia, macropsia, pelopsia, or teleopsia), Alice in Wonderland Syndrome, visual snow, and oscillopsia.
Detecting visual contours, edges, or boundaries is an important function in human and computer vision which facilitates figure-ground segmentation and object recognition. Contour integration depends on a subject's ability to link representations of separate visual stimuli into a coherent percept.
Visual snow is a phenomenon where a person perceives visual disturbances, such as fine graininess or "static," in their field of vision. This can occur in low-light conditions, in the dark, or when the visual system amplifies light perception.
The hallucinations are normally colorful, vivid images that occur during wakefulness, predominantly at night. [3] Lilliputian hallucinations (also called Alice in Wonderland syndrome), hallucinations in which people or animals appear smaller than they would be in real life, are common in cases of peduncular hallucinosis. [1]