Figure 1
From: Dynamic modulation of the perceptual load on microsaccades during a selective spatial attention task
Task paradigm, behavioral performance and main sequences. (A,B) Changes in RT (left column) and response accuracy (right column) while performing tasks under different difficulties by monkey G (black) and monkey N (red). (C) Illustration of the experimental paradigm. Two rhesus monkeys were trained to fixate on a small cross while covertly attending to a spatial location that was cued 100 ms after the beginning of each trial. The cue was a thin red ring. After the cue ring disappeared for 500 ms, five drifting gratings were presented at iso-eccentricity locations. The grating that appeared at the cued position changed color after a random interval, and the animal was tasked with detecting the change by releasing a bar within 500 ms. The perceptual load modulations on microsaccades were measured in three different time windows (TWs) and four time periods. The Control period (150 ms before the cue onset) was defined as the baseline of microsaccade activities. The others were defined as 500 ms after the onsets of the cue and the stimulus and 500 ms preceding the color change. (D,E) Main sequences. Main panels: Peak velocity as a function of the microsaccade amplitude, including all microsaccades of monkey G and N. Each black dot corresponds to a single microsaccade. Bottom and side panels: Distributions of the microsaccade amplitude and peak velocity.
