Fig. 4.

Another Acb cell showing a decrease in firing rate [type reinforcement–inhibition (RFi)] immediately after both water- and food-reinforced responding. Left, PEHs show that the Acb cell exhibited similar type RFi discharge patterns across the food (top) and water (bottom) reinforcer conditions. Mean INT for food = 25.69 ± 2.39 sec; mean INT for water = 21.18 ± 0.10 sec. Right, Raster display shows the activity of the same neuron shown in the PEHs across all trials of the multiple schedule. Trials 1–23, Food; trials 24–46, water.