Figure 2.

Eye-position traces and saccadic reaction times (SRTs). (A) A single subject's horizontal eye-position trace from the fMRI scanning session is depicted for a sequence of 24 s (16 TRs) including saccades to all five possible positions at 0°, ±7°, and ±14° of visual angle. According saccade direction is schematically depicted below, i.e., R = rightward and L = leftward. (B) The same trial sequence is shown as a single subject's horizontal EOG channel depicting rightward and leftward saccades, respectively (upward vs. downward trace shifts). (C) SRTs extracted from the EOG data and averaged across leftward and rightward saccades for each condition (arrow legend exemplary depicts rightward shifts). SRTs were shorter for centripetal as compared to centrifugal saccades. Moreover, the SRT advantage for centripetal saccades increased with greater distance to the primary position. Error bars depict the standard error (SE) of the mean across subjects; asterisks indicate significant T-tests.