Fig. 10 Phase plane of the horizontal component of three cycles of a typical IN with a PPFS waveform. The dashed rectangle indicates the ±0.5° by ±4°/sec boundaries of the foveation window. Note the accuracy (< 1 minarc) of foveation. The ver-tical loops (“rabbit ears”) are the foveating (rightward) and braking (leftward) saccades. Phase-plane trajectories move clockwise when conventional eye-movement directions are used (i.e., rightward is positive).