Self-Regulated Exposure to Light by Dark- or Light-Treated Rats

See allHide authors and affiliations

Science  02 Feb 1962:
Vol. 135, Issue 3501, pp. 377-378
DOI: 10.1126/science.135.3501.377


Rats allowed to expose themselves to light do so for a rather constant length of time each day. This duration of exposure depends upon both the brightness of the light used for testing and the illumination in which the rats were maintained before testing.