Psychology / Psych 0805 · Atom · ~20 seconds
Mental Age and the Intelligence Quotient
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Mental age is the age level of performance a person achieves; the intelligence quotient originally expressed that as a ratio to chronological age.
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A ten-year-old performing at a twelve-year-old level had a mental age of twelve under Binet's approach.
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Modern scores are not ratios. They are positions on a distribution for the test-taker's own age group.