Morphine-induced taste avoidance is attenuated with multiple conditioning trials.

S Siegel; L A Parker; I Moroz

doi:10.1016/0091-3057(94)00318-d

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Morphine-induced taste avoidance is attenuated with multiple conditioning trials.

S Siegel·L A Parker·I Moroz

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Abstract

Morphine has paradoxical effects in learning experiments. The drug can serve as a reinforcer in several situations; yet rats avoid tastes paired with morphine, much as they avoid tastes paired with an emetic drug such as lithium chloride (LiCl). The results of the present experiment indicate that, in contrast with LiCl-induced taste avoidance, the strength of morphine-induced avoidance is nonmonotonically related to the duration of training. Although taste avoidances produced by both drugs are readily established, the morphine-induced avoidance (unlike the LiCl-induced avoidance) weakens with continued flavor-drug pairings. These results, together with prior findings, suggest that there are distinctive features of morphine-induced taste avoidance.

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Animals Avoidance Learning Conditioning, Operant Lithium Chloride Male Morphine Rats Rats, Sprague-Dawley Saccharin Taste Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

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S Siegel, L A Parker, I Moroz. 1995. Morphine-induced taste avoidance is attenuated with multiple conditioning trials.. https://doi.org/10.1016/0091-3057(94)00318-d

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