Retention of a DRL 20 schedule by hippocampectomized and partially neodecorticate rats.

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Abstract
Rats trained pre-operatively on continuous reinforcement and then on graded DRL (differential reinforcement of low rates of responding) schedules of food reinforcement were tested for retention and performance after recovery from bilateral damage to the hippocampus or the posterolateral neo-cortex. No evidence of reestablishment of efficient performance on the DRL schedules was observed in the hippocampally lesioned Ssfsubjects]. Animals with neocortical destruction quickly reestablished their pre-operative performance levels.