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This article provides an overview of the intelligence measure. Details of each version, are available in seperate articles.
Wechsler Adult Intelligence Scale (WAIS) is a general test of intelligence (IQ), published in February 1955 as a revision of the Wechsler-Bellevue test (1939), a battery of tests that is composed from subtests Wechsler "adopted" from the Army Tests (Yerkes, 1921). Wechsler defined intelligence as "The global capacity of a person to act purposefully, to think rationally, and to deal effectively with his/her environment." The fourth edition of the test was released in 2008 by Pearson.
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The full scale IQ test is broken down into 14 sub tests, comprising the verbal (seven sub tests) and performance scales (seven sub tests). Wechsler's tests provide three scores:
- a verbal IQ (VIQ)
- a performance IQ (PIQ)
- a composite, single full-scale IQ score based on the combined scores.
The median full-scale IQ is centered at 100, with a standard deviation of 15. In a normal distribution this IQ range (1σ above and below the mean - that is, between 85 and 115) is where approximately 68% of adults would fall.
- David Wechsler
- Wechsler Intelligence Scale for Children (WISC)
- Wechsler Preschool and Primary Scale of Intelligence (WPPSI)
- Official page
- More descriptions about individual tests
- Ryan JJ, & Schnakenberg-Ott SD. (2003). Scoring reliability on the Wechsler Adult Intelligence Scale-Third Edition (WAIS-III). Assessment. 10 (2), 151-9. PMID 12801187
- Axelrod BN, & Ryan JJ. (2000). Prorating Wechsler Adult Intelligence Scale-III summary scores. Journal of Clinical Psychology. 56 (6), 807-11. PMID 10877468
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