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Horizontal optokinetic nystagmus for nasalward vs temporalward target motion, viewing with the left eye (right eye occluded). In both the control (A) and 3-wk monkey (B), responses were equally robust for nasalward vs temporalward stripe motion. In contrast, the 12-wk monkey (C) and 24-wk monkey (D) showed a nasotemporal asymmetry, evident as lower slow-phase velocities and fewer fast-phases of nystagmus for temporalward motion. Upward deflections = rightward movements.
