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Thresholds for anaglyphic dynamic random element stereograms that reversed in depth were determined using a method of adjustment. Hypercyclopean pattern type (horizontal or vertical gratings, or checkerboards in depth), spatial frequency (0.13–0.55 cpd), and interval between depth reversals (0.03 to 4.27 sec) were varied. Stereothresholds were lowest at 0.18 cpd and were elevated as hypercyclopean spatial frequency increased or decreased. Vertical gratings required approximately twice as much disparity to be detected as did horizontal gratings. Threshold disparity was minimum for depth reversal intervals exceeding 0.5 sec. For shorter intervals, disparity threshold doubled each time interval duration was halved, suggesting temporal integration by the stereoscopic mechanisms up to about 0.5 sec.

Temporal integration in global stereopsis