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Related Experiment Videos

Hunger and contrast in a multiple schedule.

R J Herrnstein, D H Loveland

Journal of the Experimental Analysis of Behavior

|May 1, 1974

Summary

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Pigeons

Area of Science:

Behavioral psychology and animal cognition.

Background:

Understanding how hunger affects animal behavior is crucial in behavioral psychology.
Previous research suggests a link between physiological states and reinforcement schedules.

Purpose of the Study:

To investigate the impact of body weight variations (hunger) on pigeon behavior within a multiple schedule of reinforcement.
To test the matching-law interpretation of contrast in multiple schedules.

Main Methods:

Pigeons were trained on a multiple schedule with two variable-interval components (1-min and 4-min).
Body weight was manipulated to alter hunger levels.
Response proportions in each schedule component were recorded.

Main Results:

As pigeon body weight increased (indicating greater hunger), the proportion of responses in each component more closely matched the proportion of reinforcements available in that component.

Related Experiment Videos

This effect was observed across both the 1-minute and 4-minute variable-interval schedules.

Conclusions:

Hunger levels significantly influence response allocation in multiple schedules, aligning with the matching law.
The findings support the matching-law interpretation of behavioral contrast in pigeons under varying hunger states.