Parameters of tachistoscopic stereopsis

Abstract

This study examines the effects of disparity, dot numerosity, exposure duration and the allowed processing time on briefly exposed Julesz-type random dot stereogram perception. Dot numerosity produces only minimal effects for the lower values used; reductions in exposure duration systematically reduce the performance level; and the changes in performance are found to be symmetrical for either convergent or divergent disparity and to continuously improve with disparity varying from approx 30" to over 5' of visual angle. The findings from this experiment indicate that there is only minimal summatory interaction among stereoscopic mechanisms for adjacent areas and confirm earlier estimates of the time required (approx 50 msec) for processing stereoscopic stimuli.