The role of dopamine in reinforcement: Change in reinforcement sensitivity induced by D1-type, D2-type, and nonselective dopamine receptor agonists

Article Abstract:

Dose dependent changes in sensitivity to reinforcement were found when rats were treated with low, moderate, and high doses of the partial dopamine D1-type receptor agonist SKF38393 and with the nonselective dopamine agonist apomorphine, but did not change when treated with similar doses of the selective dopamine D2-type receptor against quinpirole. Estimation of bias did not differ significantly across exposure to SKF38393 or quinpirole, but did change at the high dose of apomorphine.

Science & research, Health aspects, Dopamine, Stereotypes (Psychology), Stereotyped behavior (Psychiatry), Stereotyped behaviour

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Temporal control by progressive-interval schedules of reinforcement

Article Abstract:

Temporal control by progressive-interval schedules of reinforcement in rats is similar to that for fixed-interval schedules. Postreinforcement pausing is enhanced as a function of the interval duration. With the restoration of the progressive-interval schedule, pausing reduces and and response rates increase. With sustained exposure to the progressive-interval schedule, response rates reduce and pausing becomes prominent.

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Within-session changes in the VI response function: separating food density from elapsed session time

Article Abstract:

Relationship between response and reinforcement rate on variable-interval schedules was studied to show that the changes in food density changed the form of the variable-interval response function with no dependence on the elapsed session time. In another experiment using same schedules no effect of elapsed session time independent of food density was seen.

Time, Food, Behavioral assessment, Response consistency

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