Figure 3.

Representation of reward value and uncertainty among uncertainty-enhanced and uncertainty-suppressed BF neurons. A, Histograms of correlation coefficients for uncertainty-enhanced and uncertainty-suppressed neurons (left and right, respectively) assessing the relationship of neuronal activity and the size of predicted reward in the reward amount block. Gray represents significant correlations. Numbers of positive or negative value-coding neurons (e.g., those with significant negative or positive correlation coefficients) are indicated in italics. B–D, Average normalized responses of value coding uncertainty neurons for reward probability (red) and reward amount predictions (black). Value coding was defined by each neuron's significant correlation coefficient (negative or positive). B, CS responses of the 33 uncertainty-enhanced positive value-coding neurons. C, CS responses of the 16 uncertainty-suppressed positive value-coding neurons. D, CS responses of the 18 uncertainty-suppressed negative value-coding neurons. Insets, Reward-amount population CS responses subtracted from the reward-probability population CS responses of equal expected value *p < 0.05, significant difference between conditions (paired sign-rank test; time window: 100 ms following CS presentation until the outcome). E–G, Task dynamics of uncertainty-enhanced positive value-coding neurons (E), uncertainty-suppressed positive value-coding neurons (F), and uncertainty-suppressed negative value-coding neurons (G). Activity is separated by the 4 possible reward predictions.