Figure 1.
Schematic of the task and example of effect of the starting position on the postsaccadic activity. a, Top, Identical target (T) locations are foveated by saccadic eye movements starting from different fixation distances (FPs). Every movement requires a combination of vergence and version components. IVG and IVS are two-dimensional representations of isovergence and isoversion loci, respectively. Bottom, The conjugate (C; gray lines) and the vergence (V; black lines) eye position are shown as a function of time. The alignment is at the beginning of the saccadic eye movement (vertical line). Zero lines and calibration bars are shown for both movements. b, Top, Rasters and spike density functions of neural data aligned to target presentation (T-on) and beginning of eye movements (Sac-on). Bottom, The spike density functions are overlapped. The shaded region indicates 500 ms epoch after Sac-on. The approximate end of movement (Sac-off) is indicated. sp/s, Spikes per second.