Related Experiment Videos
Control of variation by reward probability.
Afshin Gharib1, Christopher Gade, Seth Roberts
1Department of Psychology, Dominican University of California, USA.
Journal of Experimental Psychology. Animal Behavior Processes
|October 28, 2004
Summary
Reducing reward expectation increases behavioral variation. Rats showed greater bar-press duration variability when reward probability was lower, supporting a key behavioral rule.
Area of Science:
- Behavioral neuroscience
- Animal behavior studies
- Operant conditioning
Background:
- Behavioral variation is crucial for adaptation and learning.
- Previous theories suggest reward expectation influences behavioral variability, but empirical evidence is limited.
Purpose of the Study:
- To test the rule that reduced expectation of reward increases behavioral variation.
- To investigate how different reinforcement schedules affect behavioral variability.
Main Methods:
- Two experiments using rats and bar-press tasks were conducted.
- Discrete-trial random-interval and random-ratio schedules were employed.
- Differential auditory and visual cues signaled varying reward probabilities.
Main Results:
- Bar-press duration variability was significantly higher during cues associated with lower reward probabilities in both experiments.
- This effect was consistent across both random-interval and random-ratio schedules.
Conclusions:
- The findings provide strong support for the rule that decreasing reward expectation enhances behavioral variation.
- This study offers the first well-controlled experimental validation of this principle in operant conditioning.