Abstract
Two weeks of chronic desipramine HCl (DMI) (10 mg/kg, IP) treatment did not alter reward or motor/performance components of intracranial self-stimulation (ICSS) as assessed with the rate-frequency method. Acute DMI treatment produced an ICSS reward decrement relative to saline control treatment, which was similar in size on Day 1 and Day 15 of chronic testing. The failure to find a chronic DMI effect on ICSS reward suggests that ICSS in normal rats may not be a valid animal model of depression. A better paradigm may be to test the ability of antidepressants to reverse a chronic reduction in ICSS reward function that is first produced by some other method.
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