Bertram Forer

Bertram Robin Forer was born on 24 October 1914 in Springfield, Massachusetts. He studied at the University of Massachusetts Amherst and later received his master’s degree and PhD in psychology from the University of California, Los Angeles. During the Second World War, Forer worked as a psychologist and administrator at a military hospital in France. After the war, he worked at a Los Angeles Veterans Administration clinic and in private practice.

Forer’s principal fame rests on an experiment he conducted in 1948, the results of which he published in 1949 in an article titled “The Fallacy of Personal Validation.” He gave his students a personality test and later told each one that he had prepared an individualized personality description based on that student’s answers. In fact, every student received exactly the same text: a collection of general and relatively favorable statements that could appear true of very different people. Nevertheless, the students rated the description as highly accurate.

The result later became known as the “Forer effect,” or the “Barnum effect.” It refers to people’s tendency to accept vague, general, and partly positive statements as uniquely descriptive of their own personality. The concept has been widely used to explain the appeal of astrology, fortune-telling, certain personality-typing methods, and other assessments built from broad statements.

Forer’s work matters because it demonstrates a classic example of “subjective validation”: the personal feeling that “this description is exactly about me” does not necessarily establish that a description is scientifically valid or genuinely individualized. The experiment has been replicated many times and has become a well-known example in teaching critical thinking, personality psychology, and the evaluation of psychological tests.

Forer died on 6 April 2000 in Ventura, California. His name remains closely associated with the Forer effect and the human tendency to personalize general statements.