Fig. S4.

Continuous regression analysis. (A) Each panel shows the fraction of neurons that significantly explained changes in reward anticipation in a monkey. Regression was performed every 100 ms. The data were separated into early- (solid line) and late- (dashed line) reward trials. The vertical lines demarcate the mean ±1 SE time of reward. (B) The strength of the regression coefficient associated with surprise reward (SR) is displayed. The surprise reward was delivered 500 ms before target onset (blue arrow).