Figure 6.

Effects of amygdala lesions on conditioned reinforcement. Graphs show the contrast in responding for the conditioned cue B, which had been paired with 02, and the control cue. The contrast was calculated as ((R⁺ + R⁻)/(R⁺ − R⁻)).(Left) Responding in rats in which the 02 outcome was not devalued. (Right) Responding in rats in which the 02 outcome was devalued. Control rats (closed boxes) exhibited an increase in differential responding across days and there was no effect of devaluation. Lesioned rats (open boxes) exhibited no evidence of differntial responding, whether or not the outcome had been devalued.