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intelligence quotient (IQ). defined originally as the ratio of mental age (ma) to chronological age (ca) multiplied by 100 [thus, IQ = (ma/ca) x 100]. On contemporary intelligence tests, the average performance for a given age is assigned a score of 100.efined originally as the ratio of mental age (ma) to chronological age (ca) multiplied by 100 [thus, IQ = (ma/ca) x 100]. On contemporary intelligence tests, the average performance for a given age is assigned a score of 100.
IQ testing is a method used by psychologists to measure what is generally considered intelligence. The concept of IQ, or Intelligence Quotient was first introduced by French psychologist Alfred Binet in 1904. The quotient refers to Binet's definition of IQ as (Mental Age) divided by (Chronological Age) or M.A./C.A.This quotient is then multiplied by 100 to make it a whole number. An 8 year old child with the mental ability of a 12 year old has a mental age which is 1.50 times his chronological age (12/8 = 1.5).odern IQ tests use a deviation IQ rather than a ratio IQ. With this method, test takers are referenced to other people of their own age. The average IQ is still 100, but deviations from the average are assigned a number which corresponds to a percentile rank.