Verbal and Performance IQ Differences in the Determination of Brain Damage Using the SAWAIS

Abstract

The practice of using a verbal/performance IQ difference of 15 points in the determination of brain damage using the SAWAIS, appears relatively widespread. However, this practice is not grounded on a relevant empirical base. It further ignores evidence suggesting differences between the SAWAIS and Wechsler-Bellevue Scale, and takes little cognizance of the cultural complexities of the (white) South African population. This paper assesses the validity of the practice by determining the incidence of verbal/performance IQ differences in the SAWAIS standardization group. A difference of 15 points as a cut-off for brain damage appears unrealistic using the SAWAIS.