FIGURE 12.

Horizontal smooth pursuit for nasalward vs temporalward target motion, viewing with the right eye (left eye occluded). In both the control (A) and 3-wk monkey (B), horizontal pursuit was equally robust for nasalward vs temporalward motion. In contrast, the 12-wk monkey (C) and 24-wk monkey (D) showed a nasotemporal asymmetry, evident as lower-velocity pursuit in response to temporalward motion. Eye position (upper panels) and eye velocity (lower panels); 10 trials for each direction; upward deflections = rightward movements; eye velocity profiles = mean ± SD.