Date of Graduation

2002

Document Type

Thesis

Degree Type

MA

Committee Chair

Michael Perone

Abstract

Eight rats were exposed to a concurrent-chains procedure. Half of the rats chose between a fixed-interval schedule that required low rates of responding in the paced terminal link and a simple fixed-interval schedule in the unpaced terminal link. The other half chose between a fixed-interval schedule that required high rates of responding and a simple fixed-interval schedule. Interresponse-time criteria were based on the percentiles of a baseline distribution of interresponse times obtained for each rat. The criteria increased in stringency across conditions. Consistent changes in response rates as the result of the interresponse-time criteria were not obtained. Therefore, preference between the paced and unpaced fixed-interval schedules could not be determined. It was concluded the most likely reason that effects of the pacing contingency were not observed is because the criteria were not sufficiently stringent.

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