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The effect on the test behavior of children, as reflected in the I.Q. scores, when reinforced after each correct response.

This experiment studied the effect on intelligence test scores of a probable reinforcer given for correct responses. Eleven pairs of 5- to 7-yr-old children were matched on the basis of a strong liking of candy, no physical problems associated with eating it, parent permission to receive and eat the candy, age, sex, and a revised Stanford-Binet Scale Form L IQ score. The control group was given the revised Stanford-Binet Scale Form M, as prescribed in the test manual. The experimental group was also given Form M according to the manual, except M&M candy was given for each plus or correct response. There was an appreciable, statistically significant difference between the resulting IQ test scores of the two groups.