February 20th
- American psychobiologistwho discovered the body’s biorhythms and identified the part of the brain that controls daily cycles of sleeping, waking and other activities.
- He first wrote about this biological clock in a 1927 paper in which he described how internal cycles control an animal’s drinking, eating, running, and sexual behaviour.
- He also studied the great extent to which animal biological processes can be modified by learned behaviour.
