Figure 2.
Influence of experimental conditions on anticipatory pursuit movements and neuronal activity. An example of activity of a single SEF neuron is shown. The four experimental conditions tested were randomly interleaved in a block of 200 trials. Each panel shows individual eye velocity traces (thin gray traces, leftward movements; thin black traces, rightward movements), average eye velocity (thick traces), spike densities (red, preferred direction; blue, antipreferred direction), and raster displays (preferred direction only) for the four experimental conditions tested. Upward arrows show when spike densities become statistically significantly different (Wilcoxon rank sum test, p < 0.05 for 100 ms). Boxes labeled fix, d1, and d2 indicate 200 ms periods of neuronal activity during which the influence of cue type and direction was measured and tested for statistical significance of observed effects. For this neuron, there was a significant effect of cued direction during the three periods fix, d1, and d2 (indicated with asterisks; ANOVA, p < 0.01). A1, A2, Neutral cue/no-delay condition. B1, B2, Directional cue/no delay. C1, C2, Neutral cue/delay. D1, D2, Directional cue/delay.