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• W2003145446 endingPage "74" @default.
• W2003145446 startingPage "1" @default.
• W2003145446 abstract "The results obtained in these experiments, and those of previous work with several active-passive avoidance tasks, show that (i) enhancements of locomotor responses to no go signals can occur after scopolamine and amphetamine, both with an extinction and with a passive avoidance contingency during compounds made up of the active avoidance signal and of a stimulus from a different modality; (ii) complex interactions between treatments, cues, and response-reinforcement relations can lead to marked differences between amphetamine and scopolamine hyperresponding in unsignaled portions of the schedules; (iii) a moderate LSD-25 disinhibition can take place in conditioned inhibition tasks, but not when the no go compound signals a passive avoidance contingency; (iv) a moderate disinhibition occurs also after chlordiazepoxide treatments; (v) the physostigmine facilitation of differential responding does not depend on the particular response-reinforcement contingency in no go trials; and (vi) the chlorpromazine depression of active responding is a nonselective one, and is not accompanied by any increase of low baseline responses. The following main conclusions can be drawn on the basis of the above data and those of the literature. In the first place, the fact that the LSD-25 disinhibition depends on response-reinforcement relations in no go trials, and not on task difficulty per se, suggests that the mechanisms underlying response withholding with an extinction and with a passive avoidance contingency, respectively, are at least in part separated from each other, even when stimulus factors appear to make comparable contributions to the overall variance with different response-reinforcement relations (Frontali and Bignami, 1974). Second, the scopolamine syndrome consists mainly of high order interactions between treatment, sensory, and response factors given a particular reinforcement background, while response-reinforcement relations have importance mainly for compensation phenomena that allow to eliminate adverse consequences at the reinforcement level. Third, the definition of the amphetamine syndrome oscillates between a genuine motor bias (when responses of the preparatory type are used in alimentary tasks, or highly prepared motor responses are used in defensive tasks) and a genuine stimulation of reinforcement mechanisms (when other types of outputs are used, often allowing a facilitation of differential responding). Fourth, highly tentative alternative models are required to account for the benzodiazepine syndrome, since at least part of it cannot be ascribed to an attenuation of punishment suppression, nor to a reduction of fear. Fifth, the most parsimonious explanation of the chlorpromazine syndrome remains that of an overall psychomotor depression." @default.
• W2003145446 created "2016-06-24" @default.
• W2003145446 creator A5009857500 @default.
• W2003145446 creator A5013479981 @default.
• W2003145446 creator A5033680176 @default.
• W2003145446 creator A5075514239 @default.
• W2003145446 date "1976-09-01" @default.
• W2003145446 modified "2023-09-27" @default.
• W2003145446 title "A pharmacological analysis of processes underlying differential responding: a review and further experiments with scopolamine, amphetamine, lysergic acid diethylamide (LSD-25), chlordiazepoxide, physostigmine, and chlorpromazine" @default.
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