Abstract

We studied depth perception and the effects of interocular (i/o) delay in correlated (C) and anticorrelated (a/C) stereograms (same or opposite sign of brightness contrast on corresponding retinal loci, respectively). (i) Depth was readily obtained with all (briefly presented) contoured objects, but stereothresholds were higher with a/C than C objects. Above threshold, depth persisted up to some 120 msec of i/o delay whose only effect upon perception of a/C objects was a reduction of rivalry. (ii) In dynamic random dot stereograms (DRDS), i/o delay evoked perception of rotational 3-D motion that persisted up to 50 msec i/o delay¹; with anticorrelated DRDS, motion went in the opposite direction.² Disparity-based depth in correlated DRDS persisted to ~40 msec of i/o delay.¹ With or without an i/o delay, depth was never seen with anticorrelated DRDS. This negative result held for a range of stimulus durations and interstimulus internals with the background either dark or at the mean grey level.

© 1991 Optical Society of America