Abstract
The present study evaluated the effects of microinjections of 6-hydroxydopamine into the ventral mesencephalic tegmental area (nucleus_A10) on aggressive behavior in rats. This treatment resulted in a reduction in foot-shock-induced fighting but failed to influence muricide (mouse-killing) behavior in chronically isolated rats. The general activity of animals tested in the open field was significantly increased two weeks after lesions. These behavioral changes were accompanied by a significant depletion of forebrain dopamine, with no difference between lesioned and sham-lesioned rats in norepinephrine and 5-hydroxyindole acetic acid levels.
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