Appendix I: The WISC-IV and WAIS-IV Subtests

170 Appendix I: The WISC-IV and WAIS-IV SubtestsBoth the WISC-IV and the WAIS-IV give five main scores for index abilities and Full Scale IQ, which correspond to the factors derived from factor analytic studies:Verbal Comprehension Index: A measure of an individual s ability to understand, learn and retain verbal information and to use language to solve novel Reasoning Index: A measure of an individual s ability to understand visual information and to solve novel abstract visual Memory Index: A measure of an individual s ability to hold verbal infor-mation in short-term memory and to manipulate that Speed Index: A measure of mental speed, though the score may also be affected by other cognitive factors, such as attention, as well as ability to use a Scale IQ: A measure of an individual s overall cognitive ability based on the individual s performance on all the Subtests that are used to measure the four index scales.

Perceptual Reasoning Index has three core subtests, which are: Block Design The individual is required to copy a pattern using coloured blocks. The item is designed to assess an individual’s ability to understand complex visual information. Picture Concepts The individual is shown either two or three rows of pictures and has to choose

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