intelligence quotient

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intelligence quotient

a measure of the intelligence of an individual derived from results obtained from specially designed tests. The quotient is traditionally derived by dividing an individual's mental age by his chronological age and multiplying the result by 100

intelligence quotient (IQ)

a unit used in the field of INTELLIGENCE measurement and testing as an index of an individual's intelligence relative to a comparable population with respect to age. A ratio IQ is the IQ expressed as a ratio of mental age (as measured by a test) to chronological age, and multiplied by 100 to avoid decimals:

The average child at any one chronological age will therefore score 100 on the appropriate set of IQ test items. This was the original IQ measure first used in 1916 in the Stanford-Binet Test.

Modern tests make use of standard scores, which express the individual's distance from the mean in terms of the standard deviation, and assume a normal distribution. In a variant of this, the deviation IQ, the mean is 100 and a standard deviation of 15 or 16 is usual.

It is important to note the difference between these measures, since the deviation IQ is not a ratio of mental age to chronological age, and the measured IQs derived from it will depend on the standard deviation used in the test. see also INTELLIGENCE TEST.

intelligence quotient

[in′tel·ə·jəns ‚kwōsh·ənt]
The numerical designation for intelligence expressed as a ratio of an individual's performance on a standardized test to the average performance according to age. Abbreviated IQ.
References in periodicals archive ?
In 1986, Judge Peckham expanded his 1979 order to prohibit the use of IQ tests for African-American students for any special education program.
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We begin with an overview of the recent psychological literature on the validity of IQ tests and then proceed to our discussion of the link between IQ and immigrant wages.
Richard Lynn and his colleagues have since demonstrated that Asian Americans outscore white Americans by about four points on IQ tests, and East Asian countries have the highest national IQ's in the world.
Mencap applied to Pertemps to help purchase Its own IQ test pack, so that they can offer athletes the necessary tests at little or no cost.
Children's mental ability was assessed by IQ tests administered by doctors and teachers' ratings of their reading, writing and maths skills.
In contrast, autistic kids and adults scored far higher on the Ravens test than they did on the IQ tests.
For further information, and a Home IQ Test, call 0800 05 63672 or click on www.
Parents' Guide To IQ Testing and Gifted Education has advice for parents of exceptionally gifted children, parents of children who are so bored with the normal school curriculum they are inclined to "coast" on their gifts, parents of gifted children with learning disorders, and parents seeking to learn more about IQ tests in America, how they are administered, how their results are used, and what they really reveal.
Some people go for regular eye tests, others go for IQ tests, just to make sure their brain is in tip top condition.