Vision Research 33:759-766 (1993)

Birgitta Dresp-Langley
Centre National de la Recherche Scientifique
Detection thresholds for a small light spot were measured at various distances from the colinear inucer edges of white inducing elements on a dark background. The data show that thresholds are elevated when the target is located close to one or more inducing element(s). Threshold elevations diminish with increasing distance of the target from colinear edges and decreasing surface size of the inducing elements. gradients show the same tendencies. Tbe present observations add empirical support to the idea that illusory figures are determined by local mechanisms that operate at early stages of perceptual information processing and decision.
Keywords illusory contours  spatial gaps  perceptual integration
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