The perception of figure-ground organization is a highly context-sensitive phenomenon. Accumulating evidence
suggests that the so-called completion phenomenon is tightly linked to this figure-ground organization. While many
computational models have applied borderline completion algorithms based on the detection of boundary alignments,
we point out the problems of this approach.We hypothesize that completion is a result of computing the figure-ground
organization. Specifically, the global interactions in the neural network activate the “border-ownership” sensitive
neurons at the location where no luminance contrast is given and this activation corresponds to the perception of
illusory contours. The implications of this result to the general property of emerging Gestalt percepts are discussed.