Examples of non-human primate (panel A from Bizzi, et al. 1972) and human subject (panel B, Taylor and King, unpublished results) “predictive” gaze shifts. In A, The traces from top to bottom are eye position, head position, and right and left splenii capitus EMG. In B, the red trace is eye position in the orbit and the blue trace is head position in space. In both panels, the arrows point to the onset of the head movement, which precedes the rapid eye movement. In A, the calibrations are 200 msec, 30 deg eye position and 40 deg, head position.