Authors starting with Y from Stuart Lutz Historic Documents, Inc.

(1876-1956). A comparative psychologist, Yerkes developed the Yerkes-Dodson law relating motivation and performance. He studied chimpanzee behavior. As President of the American Psychological Association in 1917, Yerkes helped shape the response of psychologists to the needs of World War I, the first large-scale program of applied psychology. <P> TLS. 1pg. 8 ‰ˆ" x 11". 5 April 1945. New Haven. A typed letter signed <I>"<B>Robert M. Yerkes</B>"</I>... more information