Fig. 7.

Dissociating a winner-take-all from a movement trajectory representation. A and B: sequence of snapshots illustrates the structure of the behavioral task with a single target. C and D: traces plot the horizontal vs. vertical eye velocity in selection (blue) and single target trials (red) from one session (C) and from the average across all the recording sessions (D). In C, gray dots show the eye velocity from single trials at 200 ms after target motion. In D, only the single target trials that were most similar to the selection trials are presented (mimic behavior trials). The solid circles (●), plus signs (+), and open circles (○) show the data at 100, 150, and 200 ms after target motion onset. E: average firing rate from 800 ms before target motion onset to 200 ms after target motion onset in the selection (blue), single large reward target (black), and mimic trials (red). The upper and lower traces show the average in the preferred and nonpreferred conditions. Histograms show the distribution of differences between the activity in the selection and mimic behavior (red) or mimic cue (blue) trials in the preferred (F) and nonpreferred condition (G). The solid black lines show the corresponding distributions of the resampling method. For each neuron, the response was averaged across the 800 ms before target motion onset. In E–G, we only used the neurons with significantly different responses (P < 0.01, Mann-Whitney U-test) between selection conditions (n = 72).