Figure 4.

Eye position and velocity resulting from trains of biphasic pulses that are sinusoidally modulated in current amplitude (AM) at different frequencies. Data is from the same animals as the representative traces in Figure 2 (MC6). The pulse frequency is 300 pps. Current amplitude is modulated to up 125 μA maximum. (A) Sinusoidal modulation at 0.5 Hz. (B) Sinusoidal modulation at 5.0 Hz. (C) Sinusoidal modulation at 20 Hz. Traces from top to bottom for each panel are slow phase eye velocity (black) and saccadic velocity (gray), eye position (black). The bottom trace of the figure is the stimulus train. The dashed vertical line indicates the onset of stimulation. The red trace in (A) is a sine wave fit to the velocity data.