In this article we present factor models to test for ability differentiation. Ability differentiation predicts that the size of IQ subtest correlations decreases as a function of the general intelligence factor. In the Schmid-Leiman decomposition of the second-order factor model, we model differentiation by introducing heteroscedastic residuals,…

Investigated the factor structure of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) for incarcerated individuals (N=234). Coefficients of congruence between the current factors and those of the WAIS-R standardization sample indicated a high degree of correspondence. (Author/BL)

Eight-seven adult outpatients in Edinburgh (Scotland) were tested with the Wechsler Adult Intelligence Scale--Revised (WAIS-R) and a test of visual inspection time (IT). Factor analysis confirms that IT correlates more strongly with performance than with verbal intelligence quotient (IQ) scores. Implications for the study of IT and mental tests…

Investigated the construct validity of the implied and theoretical structures of the Wechsler Adult Intelligence Scale-III (WAIS-III). Results using the standardization sample of 2,450 adults and adolescents indicate that the WAIS-III provides an excellent measure of the four-factor model and a general factor, but they do not support the construct…

Research on the Wechsler Memory Scale (WMS) is reviewed, including the relationship of Memory Quotient to Full Scale IQ. Despite its limitations, WMS has been a sensitive test of short-term memory, which may be helpful in identifying dominant (left) temporal lobe impairment. (Author/SJL)