In the collinearity experiment, stimuli consisted of 16 gabors. In the SEQ condition, one fourth of the stimulus was presented at a time (A, gray dashed line). The orientation of the gabors was either random (A), or four of the gabors were aligned (B) forming a horizontal or vertical line. (C) Mean signal changes for each area, defined as described in Fig. 2 (n=12). (B) Sensory suppression indexes for the two perceptual organization conditions. Vertical bars indicate SEM, *=p<.05, **=p<.01, ***=p<.001.