The Pulfrich effect: filtering portions of both eyes

This study investigated apparent depth and pattern using four conditions of hemiretinal filtering with 19 male and five female college-student SS. The results for both the depth and pattern of pendulum movement challenge the adequacy of the long-standing latency hypothesis. Apparent depth occurred without simultaneous stimulation disparity and smooth figure-8 patterns resulted only when the stimulation disparity was induced for both cortical hemispheres. The findings suggest independence of depth and pattern processing in the central nervous system and underscore the importance of viewing perception as an active constructive process.