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Updated: Aug 7, 2026
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Three Laboratory Procedures for Assessing Different Manifestations of Impulsivity in Rats
Published on: March 17, 2019
The effect of reinforcement differences on choice and response distribution during stimulus compounding
Journal of the Experimental Analysis of Behavior
|March 1, 1977
Summary
Rats showed additive summation of responses to light and tone cues only when both were associated with positive outcomes. Light cues strongly dominated responding, suggesting facilitation rather than simple summation of learned behaviors.
Area of Science:
- Behavioral Neuroscience
- Animal Behavior
- Operant Conditioning
Background:
- Stimulus control and reinforcement learning are fundamental to understanding animal behavior.
- Investigating how multiple stimuli interact to influence operant responses provides insight into complex decision-making processes.
Purpose of the Study:
- To examine additive summation of operant responses under multiple and chain schedules of reinforcement.
- To determine the influence of conflicting versus congruent stimulus-response and stimulus-reinforcer associations on behavior.
- To investigate stimulus dominance and response locus shifts in rats.
Main Methods:
- Rats were trained on operant tasks using light and tone stimuli associated with lever responses.
- Multiple and chain schedules of reinforcement were employed to create different associative contexts.
- Stimulus-response and stimulus-reinforcer associations were manipulated to create congruent and conflicting conditions.
Main Results:
- Additive summation of responses occurred when both light and tone stimuli had positive stimulus-response and stimulus-reinforcer associations.
- Conflicting associations (positive stimulus-response, negative stimulus-reinforcer) did not yield additive summation.
- Rats showed a strong preference for the light-associated lever, even when light intensity was reduced.
- Presentation of a light cue immediately shifted responding to the light-lever, regardless of prior associations.
Conclusions:
- Additive summation is dependent on congruent positive associations between stimuli, responses, and reinforcers.
- Light stimuli exert a dominant control over operant responding, overriding other learned associations.
- Behavioral facilitation, rather than simple summation, may explain heightened responding in certain associative contexts.
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