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要旨:
Dichoptic presentation of square arrays of dots that have no local interocular conflict can produce binocular rivalry if the two arrays are of opposite contrast relative to a gray background. Subjects reported when they experienced unitary percepts of only one array (and total perceptual suppression of the other array). The percentage of time of unitary perception was higher than would be predicted if rivalry occurred only locally between small independent retinotopic zones. Since the retinal location of each dot did not overlap the corresponding retinal locations of any dots in the other stimulus, unitary perception must have occurred when each dot in the nonvisible array was phenomenologically suppressed by a portion of the perceived array that contained only pixels of background luminance. This suggests that these stimuli were able to rival as textured surfaces rather than as sets of individual elements. Introduction of small (< 0.05 deg) random displacements of each dot increased unitary perception of the arrays. These displacements may have disrupted segmentation mechanisms that were activated by collinearity in the regularly spaced arrays, thereby enhancing the perception of the arrays as surfaces. Experiments are in progress to determine whether Gestalt grouping principles influence the amount of unitary perception.
