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Intravenous muscimol administration increases the activity of dopaminergic neurons of the A10 cell group, located in the ventral tegmental area. Evidence suggests that this increase in activity is produced by disinhibition following the inhibition of GABAergic (''non-dopaminergic'') cells in the ventral tegmental area. We hypothesized that the activation of A10 cells by muscimol is likely to be at...