Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"progressive ratio"”.
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Evaluation of absolute and relative reinforcer value using progressive ratio schedules
… with developmental disabilities using progressive ratio schedules. High- and low-preferred stimuli were determined based on the results of a paired-stimulus preference assessment and were evaluated in subsequent reinforcer and progressive ratio assessments using concurrent- and …
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Evaluation of stimuli along a hierarchy under additive and geometric progressive-ratio schedules
… participants' responses to a task under two progressive-ratio schedules (i.e., geometric and additive). Furthermore, the study served as an examination of the variations in response levels across an array of preferences (HP, MP, LP) under the two increasing schedule requirements. Three …
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The Influence of Sustained CB1 Blockade During Adolescence on Breakpoints in a Progressive-ratio Paradigm
… Motivation to work for food was measured in progressive-ratio sessions at varying levels of food deprivation. For rats that consumed fewer calories throughout adolescence, whether because of pharmacological intervention or food-restriction, motivation was not significantly related to the …
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Ghrelin, Cannabinoids, and Motivation: Increased Food Motivation on Progressive Ratio Paradigm Through MAGL/FAAH Inhibition in a Rat Model
… bound cannabinoid enzymes. First, we used a progressive ratio paradigm to examine the behavioural effects of blocking cannabinoid catabolism on ghrelin induced motivated feeding by administering an intra-VTA infusion of cannabinoid degrading enzymes (MAGL/FAAH) inhibitors …
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Determining the Effects of Basic Feedback and Directive Feedback Environments on Task Productivity, Accuracy, Perceived Stress, Control and Demand under Forced Choice and Mixed Choice Progressive Ratio Schedules of Reinforcement
… choice and mixed-choice conditions under a progressive ratio schedule. Dependent variables included task productivity and accuracy, monetary earnings, and self-reported social validity on perceived control, stress, and demand. The data demonstrate higher levels of accuracy associated with …
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THE GROUP II METABOTROPIC GLUTAMATE AGONIST, LY379268, DECREASES METHAMPHETAMINE SELF-ADMINISTRATION IN RATS
<italic>Rationale</italic>: Methamphetamine (METH) abuse is a growing problem worldwide, for which there is no effective pharmacotherapy. Group II metabotropic glutamate receptor (mGluR) agonists are proposed to serve as an addiction treatment and have been shown to reduce the reinforcing …
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An Assessment of Deficits in Simple Discrimination Following Frontal Traumatic Brain Injury in Rats: The Relative Contribution of Motor Deficits, Motivation Deficits and Neuroprotective Drug Administration
… on a simple visual discrimination task and a progressive ratio schedule of reinforcement (PR). After assessing their baseline discrimination performance, motor ability and PR performance, they were advanced to surgery and given either a bilateral frontal controlled cortical impact TBI or sham …
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Neuromedin U Acts via the Paraventricular Nucleus of the Hypothalamus and the Dorsal Raphe Nucleus to Regulate Motivation for High-Fat Food
… (e.g., high-fat food) can be assessed using a progressive-ratio schedule of reinforcement under which an increasing number of lever presses are required to obtain subsequent reinforcers. Here, we used a progressive-ratio operant responding paradigm in combination with assessments of food …
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Effects of blockade of muscarinic receptors in the ventral tegmental area : attenuation of cocaine reward, but enhancement of locomotor activity and dopamine overflow in the nucleus accumbens
… cocaine self-administered on either fixed ratio or progressive ratio schedules of reinforcement. Low doses of atropine sulphate, the lipophilic form of the drug, produced a compensatory increase in cocaine intake while the administration of higher doses of atropine sulphate extinguished …
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Investigating Cadm2 genetic variation in attention and motivation
… and knock-out Cadm2 mice were run on rCPT and a Progressive Ratio task to investigate how the impulsive and motivation related behaviours of these animals may differ. We discovered that Cadm2 genetic variation resulted in differences in these traits, with knock-out animals showing different …
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An Evaluation of the Validity of Vocal Preference Assessments Used with Adults with Developmental Disabilities
… activities were evaluated using a progressive-ratio schedule of reinforcement, within a multielement design. Results showed the preference assessments that included activity access were more likely to identify reinforcers that were effective under increasing response requirements, …
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Touchscreen Assessment of Motivation and Reinforcement-Related Choice Behaviour in Mice
… the optimisation and application of fixed and progressive ratio tasks for the assessment of motivational state in mice. First, a comparison of multiple reinforcers under fixed and progressive ratio schedules is described. Given the limitations of performance measures derived from performance …
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Goal Setting in Sports: Increasing the Rate of Dribbling a Basketball
… through a) comparison of goal-setting methods (progressive-ratio versus percentile methods) for training a fundamental basketball skill (dribbling) and b) observation of the effects of goal-setting methods for this skill in practice on dribbling performances in situations more similar to those …
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Translating reinforcer dimensions and behavioral economic demand to inform incentive delivery in organizational behavior management
… a hypothetical and experiential demand preparation into a computerized task for use with Amazon Mechanical Turk Workers to evaluate the effects of parametric manipulations of reinforcer dimensions on performance using a behavioral economic demand framework. The first experiment examined the …
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Novel approaches towards pharmacological enhancement of motivation
… section describes the identification and exploration of a novel pharmacological target for treating apathy. By using a progressive ratio (PR) schedule of reinforcement, muscarinic acetylcholine receptor antagonists were found to facilitate motivated behaviour in intact mice. Furthermore, …
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Study of the Role of the Bed Nucleus of the Stria Termialis D1- and D2-Like Dopamine Receptors in Cocaine Self-Administering Rats
… into the BST immediately prior to self-administration sessions, were examined in both sucrose (180-minute sessions) and cocaine (270-minute sessions) self-administering rats. Injections of SCH-23390 (3.2 & 6.4 microgram) to the cocaine group significantly reduced the final ratio of operant lever …
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The Enduring Outcomes of Stress During Neurodevelopment Dynamically Impact Food Reward Responsiveness and Valuation: A Meta-Analysis of Pre-Clinical Evidence
… (i.e., food intake paradigms), and effort (i.e., progressive ratio tests for food reward). This search yielded 2234 studies, 71 of which met inclusion criterion. The meta-analysis suggested the effects of ELS vary by the reward-related subconstruct tested. ELS rodents demonstrated decreased …
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Role of the Subthalamic Nucleus in the Circuitry Mediating Food- and Cocaine-Seeking Behavior
… of bilateral STN lesions on the self-administration (SA) and subsequent reinstatement of sucrose- and cocaine-seeking behavior. Bilateral STN lesions block reinstatement of cocaine-seeking behavior, but not the reinstatement of food-seeking behavior. Neuronal correlates in the NAcc are also …
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Characterizing the Development of Reward Evaluation Across Adolescence in Female and Male Long-Evans Rats
… physical, physiological, and psychological maturation. Adolescents, both human and rat, have been observed to evaluate reward differently than other ages, however little is known about how reward evaluation may change throughout adolescence, and how these developmental trajectories may vary …
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Evaluation of agonist pharmacotherapy for cocaine dependence: effects of continuous d-amphetamine treatment on cocaine self-administration in rats
… studies have shown that the route of administration and treatment regimen greatly influence the therapeutic effectiveness of d-amphetamine in that continuous, but not acute, administration of d-amphetamine decreases the reinforcing effects of cocaine. The studies presented in Chapters II and …
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