A Neural Correlate of Predicted and Actual Reward-Value Information in Monkey Pedunculopontine Tegmental and Dorsal Raphe Nucleus during Saccade Tasks
Figure 7
Population activity of DRN neurons. The activity of each neuron is presented as a row of pixels (). (a, b) Changes in the neuronal firing rate from baseline are compared in the large- (a) and small- (b) reward trials. The color of each pixel indicates the ROC value based on the comparison of the firing rate between a control period just before fixation onset (400-ms duration) and a test window centered on the pixel (100-ms duration). Warm colors (ROC > 0.5) indicate increases in the firing rate relative to the control period, whereas cool colors (ROC < 0.5) indicate decreases in the firing rate. (c) Changes in reward-dependent modulation. The ROC value of each pixel was based on the comparison of the firing rate between the large- and small-reward trials. Warm colors (ROC > 0.5) indicate higher firing rates during the large-reward trials than during the small ones. In all panels (a–c), the neurons have been sorted in order of their ROC values for the reward effect during the postreward (400–800 ms) period (c). FPon: fixation point onset, TGon: target onset, FPoff: fixation point offset, RWon and off: reward onset and offset. (Modified from [44].)
