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1 Department of Pharmacology, Northwestern University Medical School, Chicago, Illinois
The effect in mice of each of several types of cholinergic drugs upon the " one-trial" acquisition of a passive avoidance response has been measured by a later retention test. When administered shortly before the first trial, scopolamine hydrobromide, atropine sulfate, physostigmine salicylate and mecamylamine hydrochloride produced a significant reduction in one-trial learning. A similar reduction in performance was not observed when the drugs were administered immediately after the first trial. Negative results obtained with corresponding quaternary drug derivatives indicate that the peripheral effects of the drugs examined do not contribute materially to the test results.
Submitted on November 19, 1965
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