Theses and Dissertations - UTB/UTPA

Date of Award


Document Type


Degree Name

Master of Arts (MA)



First Advisor

Dr. Frederick A. Ernst

Second Advisor

Dr. Cheryl Fielding

Third Advisor

Dr. Valerie N. Neeley


Hormonal fluctuations across the menstrual and estrous cycle have been found to influence a variety of behavioral and physical responses in humans and animals, respectively. Impulsive behavior has been associated with the luteal phase of the cycle. Progressive ratio schedule of reinforcement has been widely used to assess the strength of reinforcers. In the present study, a comparison was made between the rate of motor activity, lever pressing, of early and late estrous groups. Differences between the groups were not statistically significant. Further analysis explored subjects individually. Visual examination of the data reveal extreme variability in responding, which coupled with the small number of subjects could at least partially account for the lack of significant findings.


Copyright 2011 Armandina M. Sanchez. All Rights Reserved.

Granting Institution

University of Texas-Pan American

Included in

Psychology Commons