Figure 2.

(A-C) Saccadic eye movement trajectories made to three different leftward target steps (10°, 20°, and 30°) from the same orbital eye position in esotropic monkey AMO4 when the right eye was viewing (left eye was patched). During straight-ahead binocular viewing, this animal had esotropia of 21°. Positive values indicate rightward eye position, and negative values indicate leftward eye position. (A) Trajectory of the viewing (right) eye. (B) Trajectory of the nonviewing (left) eye. (C) Degree of ocular misalignment (right-eye position - left-eye position). (D-F) Similar data from exotropic monkey AMO3 for rightward target steps during left-eye viewing. Both animals displayed disconjugate saccadic eye movements and postsaccadic drift that was orbital position dependent. Therefore, ocular misalignment before the saccade, at the end of the saccade pulse (i.e., after initial saccade), and at the end of the saccadic step (i.e., after postsaccadic drift) are all different. In all panels, trials are aligned on saccade onset.