Stress controllability influences the ataxic properties of both ethanol and midazolam in the rat.

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Abstract
Rats were administered either 80 escapable shocks or yoked inescapable shocks, were then injected with saline or several ataxic doses of either ethanol or midazolam, and then had their motoric impairment assessed by Rotarod performance. No motoric impairment was observed following saline injection. However, inescapable shock impaired Rotarod performance in response to both ethanol and midazolam at 2 hr, but not immediately poststress. Conversely, escapable shock reduced the ataxic potency of ethanol, although it had no influence on midazolam-induced ataxia. These results indicate functional alterations in behavioral reactivity to low doses of several classes of central nervous system depressants by psychological dynamics of stress exposure. Our findings demonstrate the impact of stress controllability on behavioral reactivity to two classes of drugs of abuse.

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