Effects of morphine on one-trial appetitive learning |
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Authors: | Norman White Robert Major Jonathan Siegel |
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Affiliation: | Department of Psychology, McGill University, Montreal, Quebec, Canada |
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Abstract: | Rats given intraventricular injections of morphine before and after a single training trial on a water-finding task performed significantly better on a retention test 24 hours later than rats given Ringer's injections instead of morphine either before after the training trial, and significantly better than rats given Ringer's before and after the training. Tial. The effect of morphine was interpreted as a retroactive strengthening of associations that the rats had formed during the training trial. The phenomenon suggests a possible model for understanding certain positively reinforcing actions of morphine. |
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