Subsequent to bilateral, single-stage posterior neodecortication, rats were either retrained on a preoperatively learned brightness discrimination or trained on the reversal of the preoperatively learned discrimination. Postoperative relearning was significantly retarded when the discrimination involved a reversal of the original brightness discrimination. These results then suggest that the preoperatively established brightness habit is not exclusively localized in the neocortex and that postoperative recovery of the discrimination does not involve relearning a new and independent memory engram.

Effects of shift in sucrose and saccharine concentrations on licking behavior in the rat.The recovery of a successive two-choice brightness discrimination following posterior neodecortication is significantly impaired if the reinforcement contingencies of the postoperative task are the reverse of those learned preoperatively. These results replicate a simultaneous two-choice brightness discrimination.

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