Abstract
Two groups of rats with bipolar electrodes implanted unilaterally into the left ventral tegmental area were trained to lever-press for the response contingent electrical stimulation. After preliminary lever-press training, two types of daily sessions were held on 10 consecutive days: type T +, current intensity set at the T hreshold level and each response was accompanied by the visual signal (stimulus lights above the lever briefly went off); and type ST −, current set at the S ub T hreshold level and no visual stimuli. On day 11, combination of the subthreshold current intensities and stimulus lights previously associated with the threshold stimulation (session type ST +) resulted in a significantly elevated response rates compared to the performance under the subthreshold current without visual stimuli (session type ST −). The extinction and recovery of this phenomenon are also demonstrated.
Published Version
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