Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 28 January 1966:
Vol. 151. no. 3709, pp. 475 - 476
DOI: 10.1126/science.151.3709.475
Prev | Table of Contents | Next

Articles

Weaning of Young Rats: Effect of Time on Behavior

V. Nováková 1

1 Institute of Physiology, Czechoslovak Academy of Sciences, Prague

Male rats were weaned on the 15th, 16th, 17th, 25th, and 30th day of postnatal life. The rate of elaboration of the conditioned reflex at 8 months of age and the stability of the memory trace at 12 months were studied. Compared with rats weaned at 30 days of age, those weaned on day 15 elaborated the conditioned reflex much more slowly and the memory trace was less firm. Rats weaned on days 16 and 17 elaborated the conditioned reflex more quickly than rats weaned on day 15 but more slowly than those weaned on day 30. In all groups the memory trace showed the same stability and was significantly firmer than in rats weaned on day 15. The higher nervous activity of rats weaned at the age of 25 days more nearly resembles that of rats weaned at 15 days than the 30th day.

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)