Robert Yerkes has made significant contributions to modern psychology in numerous ways, which has had an effect on many different fields of the discipline. Of such contributions, there are three that have had the greatest influence on modern psychology today. The first major contribution and certainly the one in which he had his greatest impact on psychology focuses on Yerkes' research which he conducted at the very first American primate laboratory that he himself founded. Another major influence Yerkes had on psychology today was his work on intelligent testing of American military recruits during World War I. Finally, the final influence to discuss was his development of the Yerkes-Dodson law and its impact on how we understand the relationship between arousal and performance today. After years at Yale, in 1930 Yerkes was finally able to study primates in a laboratory that had no precedent in the United States up to that time. In this laboratory which resided in Orange Park, Florida, he was able to conduct numerous research studies on primates covering many different areas in the field of psychology, such as sensory function, habit formation, and problem solving (Dewsbury, 2000). Dewsbury (2000) argues that Yerkes's research projects focusing on these aspects of psychology and further extending the field of animal experimentation were his major contributions to modern psychology and that Yerkes was able to lay the foundation for similar research from realize. conduit that can still be seen today. Other contributions to modern psychology that Yerkes is responsible for include the development of a new type of comparative psychology that he used in his research, as well as his creation... middle of paper... Habit-Formation deities. M. Bar-Eli. Editor and D.Smith. Editor (ed.). In Essential readings in sport and exercise psychology.13-22. Champaign, IL: Human Kinetics. Elliot, R. M. (1956). Robert Mearns Yerkes: 1876-1956. The American Journal of Psychology, 69:3. 487-494. Shultz, D. P., & Shultz, S. E. (2011). A history of modern psychology. United States: Cengage Learning.Triplet, R. G. (1982). The Relationship Between Clark L. Hull's Hypnosis Research and His Theory of Subsequent Learning: The Continuity of His Life's Work. Journal of the History of the Behavioral Sciences, 18. 22-31.Yerkes, Robert M., & Yerkes, A. W. (1936). Nature and conditions of the avoidance (fear) response in chimpanzees. Journal of Comparative Psychology, 21, 53-66.Yerks, R. M. (1932). Robert Mearns Yerkes. In a history of psychology in autobiography, vol II. C. Murchison (ed.). Worcester, MA: Clark University Press.