Fig 2. Initial eye speeds of the two monkeys over sessions.

A,B. Mean ocular following eye speed for monkey 1 for rightward (A) and leftward (B) image motion plotted against binned sessions following saccades to the center of the screen at short (circles) and long (squares) delays. Error bars represent 95% confidence intervals. D,E. The same plots for monkey 2. C,F. The ratio of ocular following speed for the short-delay versus the long-delay conditions (Enhancement, Eq 1) for rightward and leftward motion in monkey 1 (C) and monkey 2 (F). In general, ocular following eye speed was faster in the short-delay condition. Over time, initial ocular following eye speed increased such that this post-saccadic enhancement of the ocular following response was completely (monkey 1) or partly (monkey 2) abolished.