Abstract
Restraint stress for ten days (two times two hours daily) induces a hypersensitivity of the central cholinergic system, reflected by antagonism to amnesia induced by scopolamine at 0.1 mg/kg in a passive avoidance test and by hypersensitivity to the hypothermic effect of oxotremorine at 1 mg/kg. A restraint stress for 30 days, on the other hand, diminishes animal retention in the passive avoidance test and causes a hyposensitivity to oxotremorine-induced hypothermia, reflecting a hypoactivity of the central cholinergic system. An acute 24-hour stress causes no change. The relationship between chronic stress and associated memory deficits is discussed.
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