The Effect of Perspective Cue on Stereoscopic Depth Aftereffects

Abstract

To examine the effect of perspective information on stereo-depth aftereffects, we compared the magnitudes of the aftereffects under two conditions: the cue-concordant condition, in which binocular disparity and perspective specified the slant of adaptation stimuli in concordance, and the cue-conflict condition, in which binocular disparity specified the slant of the stimuli, while perspective specified the fronto-parallel plane. We found that the subjects who relied predominantly on the disparity-specified depth in slant estimation showed larger aftereffects in the cue-conflict condition, suggesting that the recalibration of the relationship between disparity and perceived depth facilitated by the cue-conflict is responsible for the aftereffects. However, the subjects who relied predominantly on the perspective-specified depth in slant estimation showed larger aftereffects in the cue-concordant condition, suggesting that in these subjects the aftereffects were mainly mediated by neural fatigue. Our results suggest that the stereo-depth aftereffects were caused by multiple factors such as fatigue and recalibration and their relative contributions depend on the cue weighting.