User:Gilisa/Sandbox

Amodal completion (also referd as visual completion) is the name for the perceptual phenomenonin which an ocludded object is being seen as an actually complete one. This phenomenon is one of the most known proofs for the idea that what we are seeing is actualy different from the picture we have on are retina. Much inforamtion about the phenomenon is still missing and the way in which this process is being done is, in sense, still obscure. It is unknown, for example, whether the phenomena is being done in low stages (i.e processing in the retina and the LGN) or at higher stages, however, the relativily high speed in which the completion is achived (which is dependes on the amount of the occluded region), measuring by using Response Times (RT's) suggesting that it mainly depends on low processing-even if not for all kinds of occluding objects. Fimiliar objects are seem to be complete faster than unfamiliar subjects.

History
Famous exampels for visual completion are the Kanizsa's tringle and

Phsiological and Neuropsychological Studies
Many phsyoilogical and neuropsycological studies have tried to revel the underlinig mechanisems of visual completion. Psyological studies usually used single cell recording as main method and obtiend evidence for  border coding by orientation selective cells within the pirmery visual cortex (V1) which respond even to stimuli outside their receptive field, this charicter enables the preception of illusuri countors and at least by part can give some explenations to the phenomenon.