College of Arts & Sciences

Date of Award


Document Type

Research Project Report

Degree Name

Master of Arts (MA)


Behavioral Science

First Advisor

J. Greenspan, Ph.D.

Second Advisor

James Olson, Ph.D.

Third Advisor

Robert Rothstein, Ph.D.


The purpose of this study was to investigate the effects of fixed-ratio and fixed-interval schedules of reinforcement on generalization gradients. The subjects were four female rats from the Fischer strain. All subjects v/ere conditioned in the presence of a 2000 hz tone to press the bar for reinforcement. Each subject was then trained to one of the following-schedules of reinforcement: FR-5, FR-30, FI-5, or FI-30. After maintenance on this terminal schedule for three days the subjects were tested for generalization. The generalization test consisted of variations in the frequency of the original SD. Response rate was recorded and gradients of both absolute and relative generalization were plotted. While the FR schedules produced the highest response rates, the subjects trained on the FR-5 schedule of reinforcement exhibited the most generalization.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.