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Wechsler Adult Intelligence Scale
Wechsler Adult Intelligence Scale or 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."
Additional recommended knowledge
The full scale IQ test is broken down into 14 sub tests, comprising the verbal (7 sub tests) and performance scales (7 sub tests).
Wechsler's tests provide three scores:
WAIS-R was standardised in 1981 on a sample of 1,880 US subjects, ranging from 16 to 74 years of age, broken down into 9 different age groups. It is considered to have very strong reliability. The current version is WAIS-III (1997). WAIS-IV is currently undergoing national standardization and slated for release in late 2008.
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) is where approximately 68% of adults would fall.
The WAIS-III measure is appropriate throughout adulthood and for use with those individuals over 74 years of age. For persons under 16, the Wechsler Intelligence Scale for Children (WISC, 6-16 yrs) and the Wechsler Preschool and Primary Scale of Intelligence (WPPSI, 2 1/2-7yrs, 3mos) are used. An IQ score can be obtained without administering the verbal section of the test since each section yields its own score.
A short, four-subtest, version of the battery has recently been released, allowing clinicians to form a validated estimate of verbal, performance and full scale IQ in a shorter amount of time. The Wechsler Abbreviated Scale of Intelligence (WASI) uses the vocabulary, similarities, block design and matrix reasoning subtests of the WAIS to provide an estimate of the full IQ scores.
Intelligence tests also are used in populations with psychiatric illness or brain injury, though some regard this use as controversial. Some neuropsychologists use the technique on people suffering brain damage as it leads to links with which part of the brain has been affected, or use specific subtests in order to get an idea of the extent of the brain damage. For example, digit span may be used to get a sense of attentional difficulties. Others employ the WAIS-R NI (Wechsler Adult Intelligence Scale-Revised as a Neuropsychological Instrument), another measure published by Harcourt. Each subtest score is tallied and calculated with respect to non-normal or brain-damaged norms. As the WAIS is developed for the average, non-injured individual, separate norms were developed for appropriate comparison among similar functioning individuals.
14 subtests of the WAIS-III
Optional post-tests include Digit Symbol - Incidental Learning and Digit Symbol - Free Recall.
WAIS-III Subtests Grouped According to Indices
In addition to the Verbal and Performance IQ scores, the following four indices are derived.
Note: Picture Arrangement, Comprehension, and Object Assembly do not contribute to the Index Scores
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Wechsler_Adult_Intelligence_Scale". A list of authors is available in Wikipedia.|