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Abstract
Responses of frontal cortex single units to a tone preceding medial forebrain bundle (MFB) stimulation were recorded in urethane anesthetized rats. The animals were implanted with mono-polar electrodes for MFB stimulation and, following recovery, stimulation parameters which supported self-stimulation were determined for each rat. Prior to the unit recording experiment, the animals were trained to associate a 2-sec tone with MFB stimulation. Trials were presented at variable intervals. Under urethane anesthesia, single units were isolated and the responses of units to paired and unpaired tones were determined. The results indicate that conditioning-related responses of frontal cortex single units can be recorded in urethane anesthetized rats.