Sequential priming of 3-D perceptual organization

In four experiments, the effects of sequential priming on the perceptual or ganization of complex three-dimensional (3-D) displays were examined. Obser vers were asked to view stereoscopic arrays and to search an embedded subse t of items for an odd-colored target while 3-D orientation of the stimuli w as varied randomly between trials. Search times decreased reliably when 3-D stimulus orientation was unchanged on consecutive trials, indicating subst antial sequential priming by 3-D stimulus layout. The priming was nonsensor y and was independent of priming by additional stimulus characteristics. Fi nally, priming by 3-D layout was unaffected by observers' foreknowledge of display orientation. Results indicate that perceptual organization of 3-D s timuli is guided by a short-term trace of 3-D spatial relationships between stimuli.