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Simple visual hallucinations are commonly characterized by shapes, photopsias, and grid-like patterns. [6] Complex visual hallucinations consist of highly detailed representations of people and objects. [6] The most common hallucination is of faces or cartoons. [7]
In dementia with Lewy bodies, visual hallucinations feature objects appearing to move when they are still, as well as complex scenes involving people and inanimate objects that do not exist. [14] Charles Bonnet syndrome is characterized by visual hallucinations in visually impaired individuals, often depicting clear and detailed images of ...
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]
A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. [6] They are distinguishable from several related phenomena, such as dreaming (), which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real ...
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]
Another related autoscopy disorder is known as negative autoscopy (or negative heautoscopy) a psychological phenomenon in which the affected person does not see their reflection when looking in a mirror. Although their image may be seen by others, they claim not to see it. [1]
In addition to producing hallucinations characterized by bright, "highly saturated" colors and vivid imagery, Klüver noticed that mescaline produced recurring geometric patterns in different users. He called these patterns "form constants" and categorized four types: lattices (including honeycombs , checkerboards , and triangles ), cobwebs ...
Pareidolia is a type of apophenia involving the perception of images or sounds in random stimuli. A common example is the perception of a face within an inanimate object—the headlights and grill of an automobile may appear to be "grinning". People around the world see the "Man in the Moon". [8]