THE CONTRIBUTION OF COLOR TO DEPTH PERCEIVED FROM MOTION PARALLAX

Perceived depth was measured in a colored stimulus while stimulus move ment yoked to head displacement simulated a depth of 1 cm. Velocity ju dgments were also made for similar stimuli moving at the same average speed but without head movement. Both measures decreased to a minimum of about 30-40% of the veridical values when the stimuli were equilumi nous. Perceived depth and speed also decreased for a monochromatic sti mulus as a function of luminance contrast but much more abruptly than for the chromatic stimuli. The results indicate that equiluminous colo r stimuli contribute to the perception of depth from motion parallax a nd that the contribution is not mediated by residual luminance.