Abstract
Normal nonverbal IQ is a criterion that is part of virtually every definition of specific language impairment (SLI). The present paper examines difference between two measures of nonverbal IQ in a group of language impaired children (n = 25). The two measures were the Leiter International Performance Scale (5) and the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) (10). Large difference in mean IQs were found between the two scales. The biter overestimated nonverbal IQ at low levels, and underestimated IQ at higher levels relatively to the WPPSI. Implications for assessment of language impaired children are discussed.
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