Figure 3.

Representative activity patterns of phasic active neurons in the striatum. A, Tracks of accepted electrode bundles for all rats are indicated by rectangles. Neurons recorded from blue, green, or red rectangles were classified as DLS, DMS, and VS neurons, respectively. Each diagram represents a coronal section referenced to the bregma (Paxinos and Watson, 1998). B, A raster showing spikes of a DLS neuron and corresponding events in free-choice and forced-choice trials, which are aligned with the entry time into the center hole. Bottom, PETH with 10 ms bins for this neuron. C, A corrected raster plot and an event-aligned spike histogram (EASH) with 10 ms bins, derived by linearly scaling time intervals between task events in each trial to the average intervals across all trials. Numbers of spikes between events are preserved. D–I, EASHs for representative neurons from DLS (D, E), DMS (F, G), and VS (H, I). Top, Four different blue and red lines indicate the EASHs from four different pairs of selected actions and reward outcomes. Bottom, Purple and orange lines indicate EASHs for fixed-choice blocks and free-choice blocks, respectively. Black lines indicate averages of EASHs for all trials. All EASHs (10 ms bins) are smoothed by Gaussian kernel with 30 ms SD. D, Same neuron shown in B and C.