Figure 7.
In rats trained in the discriminative stimulus paradigm, unpredicted food reward evokes a different pattern of phasic dopamine release across striatal subregions. Average dopamine (black line) ± SEM (gray vertical bars) in different striatal regions in response to unpredicted food reward (sugar pellet; time = 0). Insets: Average dopamine signal for each rat during both Baseline and Pellet epochs. Unpredicted food reward evokes phasic dopamine release in the Core (B) and DMS (C) but not the Shell (A) or DLS (D). Note that in the Core (B), the scale for the ordinate is 2 nA, twice that of the other striatal regions. * P < 0.05 for Baseline versus Pellet epochs.