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Timing and the control of variation.

A Gharib¹, S Derby, S Roberts

¹Department of Psychology, University of California, Berkeley 94720-1650, USA.

Journal of Experimental Psychology. Animal Behavior Processes

|April 12, 2001

Summary

Behavioral variation in rats was explored. Lowering reward expectation increased response variability, while reward omission had minimal impact, suggesting distinct mechanisms regulate response timing and form.

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Area of Science:

Behavioral neuroscience
Animal behavior research

Background:

Understanding behavioral variation is crucial for dissecting neural mechanisms.
Previous research suggests reward contingencies influence response patterns.

Purpose of the Study:

To investigate the regulatory mechanisms of behavioral variation in rats.
To differentiate the effects of reward omission versus altered reward expectation on response variability.

Main Methods:

Experiment 1 utilized a peak procedure with variable trial durations and food rewards.
Experiment 2 manipulated reward expectation and omission to assess their impact on response duration.

Main Results:

In Experiment 1, response duration variability increased significantly on non-rewarded trials.
Experiment 2 demonstrated that decreased reward expectation strongly affected response duration, unlike reward omission.
Response rate and duration were found to vary independently, indicating separate underlying control mechanisms.

Conclusions:

Lowering reward expectation, rather than omission, appears to be a key factor in increasing behavioral variation.
Response duration and rate reflect distinct components of the behavioral regulation system.
Rat timing accuracy may be more precise than suggested by rate-vs.-time analyses.

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