Microsaccades are triggered by low retinal image slip.

摘要: Even during visual fixation of a stationary target, our eyes perform rather erratic miniature movements, which represent random walk. These “fixational” eye movements counteract perceptual fading, consequence fast adaptation the retinal receptor systems to constant input. The most important contribution fixational is produced by microsaccades; however, specific function microsaccades only recently has been found. Here we show that occurrence correlated with low image slip ≈200 ms before microsaccade onset. This result suggests are triggered dynamically, in contrast current view randomly distributed time characterized their rate-of-occurrence 1 2 per second. As dynamic triggering mechanism, individual rate can be predicted fractal dimension trajectories. Finally, propose minimal computational model for microsaccades.