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Contingency degradation training. Mean lever presses per minute±SEM during contingency degradation training. (a) Animals with sham lesions, (b) animals with unilateral pDMS lesions, (c) animals with unilateral EC lesions, and (d) animals with EC–pDMS disconnection lesions. One action–outcome contingency was degraded by unpaired delivery of an outcome that was the same as that what was earned by pressing the degraded lever (RR-20).
