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Series Of Intermittent Heroin Injections Enhances Acquisition Of Operant Responding For Cues Paired With Natural Rewards, Jennifer Morrison
Series Of Intermittent Heroin Injections Enhances Acquisition Of Operant Responding For Cues Paired With Natural Rewards, Jennifer Morrison
Dissertations, Theses, and Capstone Projects
Repeated-intermittent heroin use has been implicated in altering learning processes. Ranaldi et al. (2009) and Morrison et al. (2011) demonstrated that repeated-intermittent heroin administration leads to an enhancement of conditioned reinforcement by a food-paired light stimulus; however, the mechanism governing this effect is still largely unknown. The aims of the present study were to examine modifications in Pavlovian and operant associations for cues paired with natural rewards after a series of intermittent heroin injections. The study consisted of three phases: (1) Pavlovian Conditioning Phase (4 days)- in which three groups of rats had a light stimulus paired with food, and …
An Exploration Of Target Event Encoding In A Predictive Learning Task With Humans: Integrated Or Separable Processing?, Natasha B. Nadler
An Exploration Of Target Event Encoding In A Predictive Learning Task With Humans: Integrated Or Separable Processing?, Natasha B. Nadler
Dissertations, Theses, and Capstone Projects
A major theme in the study of Pavlovian learning explores how attributes of a predicted event are represented and encoded. In Pavlovian conditioning, the conditioned stimulus (CS) is frequently assumed to associate with one or more of the various attributes of a motivationally significant unconditioned stimulus (US, e.g. it’s hedonic, motivational, and/or sensory features). The present research asks whether humans learn to predict and encode different aspects of motivationally neutral target events, namely, their specific sensory and temporal features in a separable or integrated manner. This question of how target events are encoded has implications for associative and timing models …