This study confirmed the construct validity of dysphasic errors but not of Block Design or dyscopia for 88 male and 22 female young adults, aged 17 to 29 yr. Right-hand sensorimotor deficits correlated with dysphasic errors but not with Block Design. Brain-damaged and learning-disabled with Halstead Impairment Index (HII) ≥ 0.4 differed from nondisabled on both dysphasic errors and Block Design. Learning-disabled with HII < 0.4 differed from nondisabled only for dysphasic errors. As a group, young learning-disabled adults had impaired language abilities. Learning-disabled with HII ≥ 0.4 and brain-damaged had generalized neuropsychological deficits characterized by less adequate language and visuospatial abilities.
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