Postmicrosaccadic Enhancement of Slow Eye Movements

摘要: Active sensation poses unique challenges to sensory systems because moving the sensor necessarily alters input stream. Sensory quality is additionally compromised if moves rapidly, as during rapid eye movements, making period immediately after movement critical for recovering reliable sensation. Here, we studied this immediate postmovement interval case of microsaccades fixation, which rapidly jitter "sensor" exactly when it being voluntarily stabilized maintain clear vision. We characterized retinal-image slip in monkeys by analyzing ocular drifts. observed enhanced drifts up ~28% relative premicrosaccade levels, and ~50 ms end. Moreover, used a technique trigger full-field image motion contingent on real-time microsaccade detection, initial following response proxy changes early visual processing caused microsaccades. When started microsaccades, was strongly suppressed, consistent with detrimental retinal effects movements. However, there ~73% increase speed, suggesting an sensitivity. These results suggest that interface between even smallest possible saccades "fixation" includes faster than usual slip, well responsiveness motion, both these phenomena need be considered interpreting pervasive neural perceptual modulations frequently around time