"Suppression of optokinesis" paper demos

Demonstration of paradigm used in the paper "Suppression of optokinesis"

When tracking an object moving against a textured background, the background retinal image moves opposite to the smooth pursuit eye movement direction. Ocular following responses to background motion in the direction of this reafferent signal are suppressed compared to motion in the direction of pursuit. To understand how these responses are suppressed, we varied the contrast of the background to tell apart two plausible accounts.