Figure 4.

Two examples of cells that showed significant dependence on the reward condition. A, C, The red and green lines indicate averaged responses in the rewarded and unrewarded conditions, respectively. The blue line indicates the magnitude of the stimulus selectivity. The cyan line at the bottom indicates the histograms of the times of start (upward) and end (downward) of the eye fixation. The red and green lines at the bottom indicate the histograms of the times of bar release (downward) and re-press (upward) in rewarded (red) and unrewarded (green) trials. The period of visual cue presentation is indicated by the light blue shading, and the time of reward delivery is indicated by the red vertical lines. B, D, Rastergrams of spike occurrence in individual trials of unrewarded (green) and rewarded (red) conditions for the cell shown in A and C, respectively. A vertical short line segment indicates a spike, and a horizontal line represents a trial. The trials shown here were consecutive trials in each condition with different stimuli. Cell shown in A and B was recorded from PRh, and that in C and D was from TE. The cell in A and B is the same cell as that in Figure 3.