FIG. 1.

Experimental design and eye position record. A: task schematic. During each of 6 runs, participants gazed at 1 of 3 targets (black outlined ring, lower section, left box) for 10 consecutive tapping trials. During each trial, the color of the ring center changed from white to black to cue participants to tap 3 times with the right thumb; trial-onset-asynchronies were 3.86, 4.825, 5.79, 6.755, or 7.72 s. B: experimental set-up. Participants positioned their right hand on their right side for one-half of the experiment and across their body midline aligned with the left shoulder for the other half of the experiment. They wore a pair of magnetic resonance imaging (MRI)-compatible goggles that displayed visual stimuli and recorded eye positions. C: eye positions across the experiment of 2 participants for the 1st 600 ms after the cue to tap appeared.