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Contrast is a feature of visual stimuli that characterizes the difference in brightness between dark and light regions of an image. Perception of contrast is affected by the temporal frequency and spatial frequency properties of a stimulus, and the sensitivity to contrast in sine wave stimuli is characterized by the contrast sensitivity function.
A contrast effect is the enhancement or diminishment, relative to normal, of perception, cognition or related performance as a result of successive (immediately previous) or simultaneous exposure to a stimulus of lesser or greater value in the same dimension. (Here, normal perception, cognition or performance is that which would be obtained in ...
The Chubb illusion is similar to another visual illusion, the contrast effect.The contrast effect is an illusion in which the perceived brightness or luminance of an identical central visual target form on a larger uniform background varies to the test subject depending on the ratio of the central form's luminance to that of its background. [4]
In contrast, associative agnosia is a type of agnosia where perception occurs but recognition still does not occur. [1] When referring to apperceptive agnosia, visual and object agnosia are most commonly discussed; this occurs because apperceptive agnosia is most likely to present visual impairments. [ 2 ]
Artificial lateral inhibition has been incorporated into artificial sensory systems, such as vision chips, [3] hearing systems, [4] and optical mice. [5] [6] An often under-appreciated point is that although lateral inhibition is visualised in a spatial sense, it is also thought to exist in what is known as "lateral inhibition across abstract ...
Though the two circled dark discs are the same size, the left disc seems smaller than the right one. The Delboeuf illusion is an optical illusion of relative size perception: In the best-known version of the illusion, two discs of identical size have been placed near to each other and one is surrounded by a ring; the surrounded disc then appears larger than the non-surrounded disc if the ring ...
"Treatment results that look impressive in small groups often vanish when larger groups are studied," The Washington Post editorial board wrote in a piece Sunday headlined, "Look to science, not ...
Hallucinogen-persisting perception disorder was first described in 1954, [9] with other observations made in early psychedelic research. [10] Horowitz [11] first introduced the term flashbacks, referring to recurrent and spontaneous perceptual distortions and unbidden images. When these "flashbacks" present as recurrent, but without a current ...