Fig. 1
Memory-guided microsaccades in monkeys and humans. a Eye position measurements from an example trial in monkey N. Upward deflections in each trace mean rightward or upward eye position displacements, respectively, and the position scale bar denotes 15 min arc. A brief target flash appeared 6 min arc to the left of and 12 min arc below fixation. After a memory interval, the fixation spot disappeared, instructing a memory-guided eye movement towards the remembered flash location. The monkey generated a spatially accurate memory-guided microsaccade after a reaction time (RT) of approximately 206 ms from fixation spot disappearance. When the target reappeared, a smaller, corrective movement (which was now visually guided) was triggered after a shorter reaction time. b Similar observations from an example trial in a human subject. In this case, the target flash occurred at 18 min arc to the right of and 6 min arc above fixation. Note that the human data were recorded with a video-based eye tracker; monkey N data were obtained from a scleral search coil (Methods). Figures 2–4 and Supplementary Figs. 2–4 demonstrate the robustness of the observations in this figure across the population, and Figs. 6–7 and Supplementary Fig. 5 highlight underlying neural mechanisms
