MOTION CAPTURE AND THE OUCHI EFFECT

Purpose: The role of motion contrast and motion capture in the 'Ouchi' effect was investigated in a simplified stimulus. Methods: Sinewave g ratings were rapidly oscillated vertically within two concentric stati onary 'apertures', an inner disc surrounded by an annulus. Results: A strong illusion of relative motion between the disc and annulus is obs erved in the horizontal direction for 8 and 12 cycles/deg given small orientation differences between the two gratings. Conclusion: These pa rameters coincide with those of the 'Ouchi' effect, suggesting a shari ng of the same causal mechanism.