Effects of noncontingent septal stimulation on the CER in the rat.

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Abstract
Chronically implanted septal rats were trained to bar press for brain stimulation. Water was then substituted as the reward and concurrent noncontingent brain stimulation was given at previously self-selected parameters. Daily CER [conditioned emotional response] trials were administered to these Ss [subjects] and to control Ss which were implanted but not stimulated. Development of suppression by stimulated Ss was significantly retarded. Exceptions in the experimental group seemed to be correlated with placements in a caudal direction. Neither the incentive value nor the reinforcing function of brain stimulation per se was considered to be the critical variable in this phenomenon.

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