Fig. 1.

Behavioral tasks and properties of microsaccades. A and B: the sequences of snapshots illustrate the temporal structure of the behavioral task when the cue was presented at the center of the screen (A) or at an eccentric location (B). Dots represent stationary targets, and arrows represent targets moving through a step-ramp target motion. Targets are shown as gray, blue, and red spots for visibility even though during most of the experiments they were white, green, and yellow. C and D: examples of horizontal and vertical eye position (C) and eye velocity (D) traces for representative microsaccades. E–G: “main sequences” for microsaccades in 3 monkeys. Each symbol shows the peak velocity as a function of saccade amplitude for an individual saccade.