Throughout his lifetime, Dinsmoor's work expanded upon B.F. Skinner's study of operant conditioning. Skinner's work had a profound effect on James Dinsmoor, who described the work of Skinner as the “bare bone's heart” of psychology. In line with Skinner's work, Dinsmoor's first published study compared the discriminative and reinforcing functions of a stimulus. Reinforcing stimuli are stimuli that are provided that increase the rate of behavior. Discriminative stimuli are defined as stimuli that signal the availability of reinforcement. For example, a mother might ring a dinner bell only when dinner is available, and this leads her children to come inside the house to get the meal. The dinner is the reinforcing stimulus, and the dinner bell is the discriminative stimulus . In James Dinsmoor's first work, he compared the rate at which behavior decreased over time in the presence of a discriminative stimulus without reinforcement, a reinforcing stimulus without the discriminative stimulus, and in the presence of no stimulus. He found that responses decreased over time at a slower rate when a discriminative stimulus was present, even without reinforcement, and concluded that discriminative stimuli act as a filter or a kind of secondary reinforcement. Dinsmoor's first work was just one of a long list of works on the secondary environmental characteristics that lead to changes in behavior, which he studied throughout his lifetime. James Dinsmoor first researched these ideas for two years at Columbia University, where he worked as a lecturer before he accepted a job at Indiana University in Bloomington, Indiana in 1951. He worked as a professor at Indiana University for 34 years, where he conducted numerous projects examining basic behavioral processes, especially discrimination learning in the area of negative reinforcement. In general, Dinsmoor's work was influential in the development of scientific knowledge on stimulus control. His work allowed for the formation of a narrative on the differential effects of various types of stimulus control techniques on differing behaviors. James Dinsmoor worked with apparatuses that provided reinforcers and punishers to laboratory animals. He knew how to build this equipment himself, and often insisted that his graduate students learn to do the same. James Dinsmoor was also heavily involved in scholarly communities through his role as an experimental psychologist. He served in a leadership role in a number of psychological institutions, such as the Midwestern Psychological Association, Division 25 of the American Psychological Association, and the Society for the Experimental Analysis of Behavior. Early in his career, he helped organize the creation of the Journal of the Experimental Analysis of Behavior, which is still in circulation today.
Political involvement
In addition to his work as an experimental psychologist, James Dinsmoor was involved politically. In the 1960s, he was involved in activism against the Vietnam War through his university, and he spoke openly at campus rallies and on the radio about his opposition to the war. He was once arrested at a war protest in the 1960s. In 1966, he ran for Congress on a platform of opposition to the Vietnam War. Timberlake quoted James Dinsmoor's campaign flyer as stating: ”The time has come for plain speaking. More than two hundred thousand young Americans have been taken from their homes, their jobs, and their families to fight and to die in a distant land. Our rate of casualties is rapidly approaching twenty-five to thirty thousand a year. Our young men are being trained to destroy crops, to burn entire villages, and to kill. In many cases, they cannot distinguish between enemies and friends, between armed guerrillas and innocent civilians.” Dinsmoor did not win the seat at Congress. Instead, he continued his academic work in the field of behaviorism.
Retirement and death
Although he was retired in 1986, James Dinsmoor continued to conduct experiments, publishing as many as 20 articles after his retirement, including one article published the year before his death. He died on August 25, 2005, at the age of 83 at a quiet summer residence in Laconia, New Hampshire and was buried at Pine Grove Cemetery in Gilford, New Hampshire. James Dinsmoor was posthumously awarded the Award for Distinguished Service to Behavior Analysis from the Society for the Advancement of Behavior Analysis in 2006 for his many contributions to the field of the experimental analysis of behavior.
