ABSTRACT
Prolonged inspection of three-dimensional depth surfaces was found to produce large aftereffects of depth, such that a physically flat test surface appeared to be corrugated in depth but with the opposite phase to that of the adapting pattern. This was true when the adapting depth surface was specified by motion parallax information and when it was specified by binocular disparities. The strengths of the parallax and stereoscopic aftereffects were measured using a nulling technique and were found to be comparable. Evidence was also obtained for possible interactions between the parallax and stereo systems. It was found that prior adaptation to a 3-D corrugated surface specified by binocular disparities, biased the interpretation of an ambiguous corrugated surface specified by relative motion. Conversely, adaptation to an unambiguous parallax surface was found to bias the interpretation of an ambiguous stereoscopic surface. Together, these results suggest that not only are there similarities between the parallax and stereo systems, but also interactions at some level in the processing hierarchy.
