Fig. 2.

Effects of varying stimulation duration on eye-head movements evoked by stimulation of the PPRF region. a Head-unrestrained condition. The green, blue, and magenta traces show movements when stimulation duration was set to 50, 100, and 200 ms, respectively. Stimulation intensity (25 µA) and frequency (300 Hz) were held constant. The individual rows plot horizontal gaze, eye-in-head and head amplitude (left column) and velocity (right column) for representative, individual trials. The first vertical line marks stimulation onset, and the remaining vertical lines denote stimulation offset for the three different durations (indicated by the different colors). b Head-restrained condition. The same format as above, but only the gaze channel is shown as the head was held stationary. Thus, the eye component equals the gaze component