The criterion validity of the factor index scores of the third edition of the Wechsler Intelligence Scale for Children (WISC-III) was evaluated in a sample of 88 children with traumatic head injury. (THI). Only Perceptual Organization and Processing Speed scores demonstrated acceptable sensitivity to injury severity. It is concluded that Processing Speed is an adequate measure of performance efficiency, but that Freedom from Distractibility may not be an adequate measure of attention in children with THI.
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