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Although there are very few studies using autoshaping procedures as a way to study the motivational properties of Pavlovian conditional stimuli, there are, of course, many studies using a different procedure—conditioned place preference CPP. With repeated pairings of the lever and cocaine rats began to approach the lever more reliably and more rapidly, whereas rats that received pseudorandom i. Corticosterone response before and after the first autoshaping session. The coin itself appeared to have great incentive value, as the raccoons were very reluctant to give it up, even though holding onto it delayed or even prevented receipt of actual food. Ethanol induces impulsive-like responding in a delay-of-reward operant choice procedure. Associative Learning and Cognition in Animals.

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The IG developed a preference for the lever over the course of training. However, upon CS presentation other rats immediately went to the place where food would be delivered, and during the CS period repeatedly operated the tray flap. Effects of deprivation state and reinforcer type. ST exhibited a preference for the CS-lever early in training, whereas GT exhibited a preference for the food cup. In humans, however, environmental cues associated with injection of a drug are usually present prior to injecting the drug—they do not suddenly appear as a consequence of taking the drug. Based on this grouping we then examined the following variables. Classically conditioned factors in drug dependence.

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Based on these data it is clear that for both sign-trackers and goal-trackers the reward-predictive cue CS provides the information necessary to support learning. Pharmacol Biochem Behav. These data provide, therefore, one physiological response that differentiates the groups even after a single training session. The Psychology of Learning and Motivation.

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Description: We and others have postulated that drug-associated cues acquire the ability to maintain and instigate drug-taking behavior in part because they acquire incentive motivational properties through Pavlovian stimulus-stimulus learning. However, it is also likely that this trait will be influenced by maternal behavior, developmental events and other environmental factors. Studies utilizing selectively bred lines of rats We have only begun to uncover some of the neurobiological and behavioral correlates of sign-tracking vs. More recently, Krank and colleagues unambiguously demonstrated the ability of an ethanol-paired cue light to elicit sign-tracking behavior in rats using unsweetened ethanol solution as the US. These findings are in agreement with those of Dalley and colleagues , who reported that accumbens D1R are necessary for the early consolidation and acquisition of sign-tracking behavior. In these studies, for example, an animal will be trained to lever press in order to receive a drug infusion, which is accompanied by the presentation of a cue e. Moreover, the lack of inhibitory control i. Sign-tracking In classical Pavlovian conditioning the presentation of a cue conditional stimulus, CS is associated with the presentation of a reward the unconditional stimulus, US , and with repeated pairings the CS comes to elicit a conditional response CR. Pavlovian conditioning with heat reinforcement produces stimulus-directed pecking in chicks.
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