![]() ![]() Just the same, English psychologist Charles Spearman proposed in the early 1900s that there’s a general intelligence factor called “g,” which is written as a single uncapitalized letter. It’s difficult to measure IQ because even after more than 100 years of research, experts still can’t define intelligence. ![]() Most people fall within one standard deviation of the mean with a score ranging from 85 to 115, and the genius level begins at about 140.Īt best, IQ scores yield an approximation of intelligence that psychologists characterize as a “snapshot.” Scores can decline as a person ages, and different IQ tests can produce slightly different scores for the same individual. The testing soon expanded to include adults, and now the tests are calibrated to produce an average score of 100. French psychologist Alfred Binet designed the first tests to calculate a child’s “mental age.” They were administered to identify kids who needed extra help in school. The predictive power and limitations of IQ scores have been apparent almost from the start of intelligence testing at the turn of the 20th century. But psychologists agree that people amount to more than a single measurement of intellect can capture. High scores on intelligence-quotient tests often correlate with success. ![]()
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