Figure 3.

Neuronal activity reflecting action in the symbolic cue task. In this display, neuronal activity is sorted according to the location of the target on the screen (Fig. 1C, T1–T5 rows) as well as to the instructions signaling a left or right future target (left and right columns). This neuron exhibited progressively greater activity after choice-cue presentation as the reach target was placed in positions farther to the right (marked with arrows). Neuronal activity was aligned to the onset of the instruction, choice cue, GO signal, and movement. The pink areas on the left indicate when the instruction was presented, and the blue areas on the right represent the choice-cue presentation period. The location of the choice cue is shown in parentheses (Fig. 1C).