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Cocaine self-administration behavior at test following unilateral vehicle or lidocaine infusion into the medial orbital cortex (MO). Each rat also received a unilateral vehicle infusion into the contralateral medial tip of the subthalamic nucleus (mSTN). Values are the mean ± s.e.m. (A) Responses on the active lever expressed as % of baseline. (B) Number of infusions earned. * p≤ 0.05 compared to the corresponding vehicle treatment.
