Abstract

Neonatal treatment of rats with clomipramine may produce adult animals which model endogenous depression. We report here that a major factor of depression in humans, the diminished capacity for pleasure, appears present in these rats. At age 7 months, bar-press responding for rewarding hypothalamic stimulation is reduced across a range of intensities. At age 4 or 5 months this effect is not seen, although other behavioral abnormalities are present at the younger age. The delayed onset of diminished intracranial self-stimulation may relate to the gradual insidious onset of endogenous depression in humans.

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