Fig. 1
From: Eyes on hold: motion task difficulty jointly delays microsaccade and pupil responses
Experimental Stimulus and Procedure. (a) On each trial observers judged motion direction relative to 1 of 8 standard directions presented at 1 of 8 polar angle locations. (b) Difficulty of the motion direction discrimination task varied based on the standard motion direction (cardinal vs. oblique) and the tilt offsets of the stimulus with respect to the standard (8° vs 0.5—4°). The standard motion direction remained constant throughout a given experimental session whereas the tilt offsets were varied randomly across trials within each session. (c) Trial sequence of the motion direction discrimination task. Observers (n = 8) responded to whether the Gabor stimulus was drifting clockwise or counterclockwise relative to the standard direction.
