Figure 3.

Neural activity related to choice and reward at reward sites. (A) Examples of choice- and reward-coding neurons at reward sites. Spike raster plots and spike density functions (σ = 100 ms) are shown for two example neurons that were responsive to both choice [left (L) vs. right (R) reward sites] and reward [reward (+) vs. no reward (−)]. Trials were grouped according to the animal's choice and reward. (B) Temporal profiles of choice and reward signals at reward sites, measured as the fraction of neurons that are significantly responsive to each variable (1 s moving window, 50 ms time steps). Large circles, significant differences between CA1 and CA3 (χ²-test, p < 0.05). Shading, chance level (binomial test). The green dashed line indicates the averaged time of reward stage offset in unrewarded trials.