Abstract
We have replicated the findings of Mirmiran and colleagues that neonatal administration of the antidepressant clomipramine (CLI) to male rats results in hyperactivity in open-field tests in adulthood. We report that this effect does not reliably occur in a "Digiscan" activity device. The difference in effect between the two activity measuring devices may be due to more stress being present in the open-field test, and we propose that the CLI-treated rats may be more reactive to stress. This hypothesized enhanced reactivity to stress may be similar to the proposed vulnerability of depressed humans to stress. In addition, we have found that the open-field effect does not occur until the rats are at least 4 months old; this delayed effect may be analogous to the progressive onset of endogenous depression in humans.
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