Who was Carl Hovland?


Carl Iver Hovland (12 June 1912 to 16 April 1961) was a psychologist working primarily at Yale University and for the US Army during World War II who studied attitude change and persuasion.

He first reported the sleeper effect after studying the effects of the Frank Capra’s propaganda film Why We Fight on soldiers in the Army. In later studies on this subject, Hovland collaborated with Irving Janis who would later become famous for his theory of groupthink. Hovland also developed social judgment theory of attitude change. Carl Hovland thought that the ability of someone to resist persuasion by a certain group depended on your degree of belonging to the group.


Carl Iver Hovland was born in Chicago on 12 June 1912. As a child, he had a deep interest in music. Up until college, when psychology became a major part of his life, he was looking into a musical career. In 1938 he married Gertrude Raddatz.

He was recruited by Samuel Stouffer, a sociologist who was on leave from University of Chicago. Hovland had the responsibility of leading a team of fifteen researchers.

Hovland was involved in a study of the conditions under which people are most likely to change their attitudes in response to persuasive messages. The Yale Group’s work was first described in Hovland’s book Communication and Persuasion, published in 1953.

His major interests in his last few years of life were with concept-formation, which he approached with computer simulation.


Psychological research was Hovland’s intellectual joy. Especially in his early career, his investigations covered many topics. His papers in psychological journals included a study of test reliability, a major review of the literature on apparent movement, as well as his four classical papers on conditioned generalization from his doctoral dissertation.

Hovland began to emphasize micro-level analysis of propaganda and its effects. Hovland’s army experiments were the beginnings of that micro-level analysis of an individual. Hovland’s “core conceptual variable was attitude”.

Hovland believed that if he was able to recognize the attitude an individual has towards a trigger, he would be able to predict the behaviour and actions of an individual over time. However, there were many studies that argued the contrary and showed that “an attitude toward a person or object does not predict or explain an individual’s overt behavior regarding that person or object”. This revelation of low correlation did not necessarily render findings useless but instead led to further research on how under certain circumstances it was possible to change a person’s behaviour via their attitudes.

While Hovland focused on an individual rather than a group level, he began to take into consideration interpersonal communication in the form of persuasion. Specifically, Hovland was responsible for carrying out a series of studies that contributed to the “cumulative understanding of persuasion behavior that has never since been matched or even rivaled”.

To test and apply his theorisation Hovland worked proposed the SMCR model. The SMCR model consists of four components – source variables, message variables, channel variables, and receiver variables. By manipulating each of these variables, Hovland was able to advance his “message-learning approach to attitude change”. There were problems with his particular approach, however, in that by focusing on a single dimension of the SMCR model, Hovland was unable to do more than isolate a factor rather than study the synergy between the different variables.


Hovland died in on 16 April 1961. When Hovland learned that he had cancer, he continued to work with his Yale doctoral students and conduct persuasion experiments. Finally, when he could work no more, he left his office in the Psychology Department, went to his home in New Haven, drew a bathtub full of water, and drowned himself.


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