Article Abstract:
A study was conducted on the behavior maintained by the oral administration of pento-orbital to rhesus monkeys using the restricted non-independent concurrent variable-ratio variable ratio schedule. The study aimed to find out whether graded preference functions would develop, whether matching would happen and whether exclusive preferences could be avoided. A relative decrease in overall response rate was found as the comparison concentration increased with response rates matching drug intakes. The exclusive preference detected in four comparisons were within the expected outcome.
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Article Abstract:
Rodent wheel running is a useful tool as an operant that produces access to food, for studies associated with a variety of parameters such as feeding and time of day, and as a schedule-induced and competing behavior. A series of experiments on rats was conducted to augment recently established methods for wheel-running reinforcement. The results support the recommendation that self-paced responding may improve the reinforcing effect of reinforcers that are presumably weak because deprivation cannot be done or is ineffective.
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Article Abstract:
The authors discuss an experiment in which rats who had been trained to discriminate pentobarbital from saline were tested under varying schedules of reinforcement.
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