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  • Title: Stereoscopic illusory contours--cortical neuron responses and human perception.
    Author: Heider B, Spillmann L, Peterhans E.
    Journal: J Cogn Neurosci; 2002 Oct 01; 14(7):1018-29. PubMed ID: 12419125.
    Abstract:
    In human perception, figure-ground segregation suggests that stereoscopic cues are grouped over wide areas of the visual field. For example, two abutting rectangles of equal luminance and size are seen as a uniform surface when presented at the same depth, but appear as two surfaces separated by an illusory contour and a step in depth when presented with different retinal disparities. Here, we describe neurons in the monkey visual cortex that signal such illusory contours and can be selective for certain figure-ground directions that human observers perceive at these contours. The results suggest that these neurons group stereoscopic cues over distances up to 8 degrees. In addition, we compare these results with human perception and show that the mean stimulus parameters required by these neurons also induce optimal percepts of illusory contours in human observers.
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