Upon completing his doctorate at Harvard, he returned to the University of California, Berkeley as a psychology professor for a few years and then joined the staff at
Johns Hopkins University in 1906. He held the title of Professor of Experimental Psychology and remained there for 20 years. His time at Hopkins was split with his brief service with the Medical Research Laboratory of the Air Service during World War I, and by his duties as the Chairman of the Division of Anthropology and Psychology, National Research Council, during 1927–1929. He was appointed president of the American Psychological Association in 1922. His research work in the army led to an interest in vestibular work. While working at Johns Hopkins, Dunlap had met
John B. Watson, who is known best for establishing the psychological school of
behaviorism. The two had worked together in the psychology department of Johns Hopkins and had a strong influence on each other's work and theories. Dunlap and Watson's views on behaviorism differed significantly. Dunlap tried to dissociate himself from Watson's behaviorism and thought it was derivative of scientific psychology. Unfortunately, however, most of his works, experiments, and other contributions were overshadowed by his colleague, John Watson. Dunlap developed a form of paradoxical therapy called 'negative practice' "making an effort to do the things that one has been making an effort not to do." through this procedure he hoped to extinguish the troublesome behavior by perhaps "bringing under voluntary control responses which had been involuntary." (Paradoxical Psychotherapy, Weeks and L'Abate p. 9) In 1938, after serving some time for the APA, he argued against many of Freud's psychoanalysis ideas. He was most against the idea of introspective and consciousness ideals brought up by Freud. This led him to write one of his most famous works “Are there any instincts?” Instead, he focused more on behaviorism and is credited with the title “response psychology”. Response psychology, or Stimulus Response Theory, is simply defined as the interplay of a stimulus and behavior. In 1936, Dunlap joined the faculty of the University of California, Los Angeles as Professor and Chairman of the department of Psychology. He remained there until he retired in 1946. During his time there Dunlap also wrote a pretty bold article about treating color blindness. His article, entitled, “Color Blindness and its Therapy” was published in the Australian Journal of Optometry in 1945. In his article, he argued against the idea of sex-linked colorblindness and equal affected of males and females. Dunlap reported on Loken's experiment regarding colorblind individuals. A control group was to read a special color chart, and an experimental group was to do the same. The control group was given a “milk sugar” as a placebo and the experimental group was given dosages of vitamin A. Results showed that there were much less errors in the naming of colors for those who took the vitamin A dosage. Dunlap died in South Carolina in 1949. These improvements made it easier to operate and did not require the experimenter to have to do any subtraction, which made studying reaction time easier. It was used in order to measure the number of taps made, the pressure exerted by the participant on the plate, as well as the grip strength exerted. All of these aided researchers in their ability to investigate the participants ability to be efficient at the task at hand. Finally, there was the Dunlap chair for vestibular research, which was a chair that was attached to a rotating device that allowed the researchers to easily rotate a person while they are sitting down. This chair became particularly helpful for his research with the Army in WWI, where he used this chair to measure vestibular activity in the soldiers’ brains after experiencing war events. == Association with John Watson ==