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The Bell Curve: Intelligence and Class Structure in American Life is a 1994 book by the psychologist Richard J. Herrnstein and the political scientist Charles Murray in which the authors argue that human intelligence is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance ...
An intelligence quotient (IQ) is a total score derived from a set of standardised tests or subtests designed to assess human intelligence. [1] The abbreviation "IQ" was coined by the psychologist William Stern for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in a 1912 book.
The Bell Curve also led to critical responses in a statement titled "Intelligence: Knowns and Unknowns" of the American Psychological Association and in several books, including The Bell Curve Debate (1995), Inequality by Design (1996) and a second edition of The Mismeasure of Man (1996) by Stephen Jay Gould. [22] [23]
Arthur Robert Jensen (August 24, 1923 – October 22, 2012) was an American psychologist and writer. He was a professor of educational psychology at the University of California, Berkeley. [1][2] Jensen was known for his work in psychometrics and differential psychology, the study of how and why individuals differ behaviorally from one another.
Flynn effect. The Flynn effect is the substantial and long-sustained increase in both fluid and crystallized intelligence test scores that were measured in many parts of the world over the 20th century, named after researcher James Flynn (1934–2020). [1][2] When intelligence quotient (IQ) tests are initially standardized using a sample of ...
Norm-referenced test. A norm-referenced test (NRT) is a type of test, assessment, or evaluation which yields an estimate of the position of the tested individual in a predefined population, with respect to the trait being measured. Assigning scores on such tests may be described as relative grading, marking on a curve (BrE) or grading on a ...
Richard Julius Herrnstein (May 20, 1930 – September 13, 1994) was an American psychologist at Harvard University. He was an active researcher in animal learning in the Skinnerian tradition. Herrnstein was the Edgar Pierce Professor of Psychology until his death, and previously chaired the Harvard Department of Psychology for five years.
The book also argues that IQ scores are a valid, though imperfect, indicator of general intelligence, while criticizing some of the assertions made about such scores in the 1994 book The Bell Curve. The book's appendix argues that racial differences in IQ are entirely due to environmental factors. [4]
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