Abstract
We have studied that the difference between the perceptions of edge sharpness of horizontal and vertical three dimensional edge is caused by the alternation of dominant eye. In order to detect a suppression of half-occluded region caused by the alternation, we assessed the detectability d' of a monocular small gray dot target presented on a half-occluded region of stereoscopic background images by comparison with that on a two-dimensional region. As a result, we found that the contrast threshold of the target on the half-occluded region was higher than that on the two-dimensional region. This elevation of contrast threshold indicates that local interocular suppression of the half-occluded region occurs more frequently than that of the two-dimensional region.
