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Journal of Experimental Biology 25,395-405 (1948)
Published by Company of Biologists 1948

The Effect of Sex-Hormones on the Performance of a Learned Response

J. W. B. DOUGLAS ¹, D. A. HANSON ¹, and S. ZUCKERMAN ¹

¹ Department of Anatomy, University of Birmingham

1. The Hull ‘Goal-Gradient Alley’ is described, and its advantages in the analysis of the effect of hormonal stimulation upon conditioning are discussed.

2. The rate at which spayed rats run the goal-gradient alley was tested before and after the administration of oestrogen alone and oestrogen combined with androgen.

3. It was found that a decrement in the speed of running for food occurs at varying times from 6 to 102 hr. after the administration of oestradiol benzoate.

4. The decrement is still apparent when testosterone propionate and oestradiol benzoate are administered in the proportion 20:1, but is not present when the proportion is 50:1.

5. The possible physiological mechanisms of this response decrement are considered.