WECHSLER ADULT INTELLIGENCE SCALE-REVISED IN THE EVALUATION OF ANTERIOR TEMPORAL LOBECTOMY CANDIDATES

We wished to (a) determine the ability of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) to discriminate between patients with epilepsy of left or right temporal lobe (LTLE, RTLE) origin and (b) examine the ability of Kaufman's (1990) WAIS-R short forms to estimate actual Full-Scale IQ (FSIQ). We administered the WAIS-R to 215 nonretarded, left hemisphere dominant patients with invasively verified epilepsy of unilateral TL origin without lesions demonstrated by magnetic resonance imaging (MRI) (excluding mesial temporal sclerosis, MTS). LTLE (n = 106) and RTLE (n = 109) groups were compared on the WAIS-R subtests and summary IQ scores, Verbal-Performance IQ (VIQ-PIQ) discrepancies of various magnitudes, and Verbal Comprehension (VC) and Perceptual Organization (PO) scores derived by factor analysis. The LTLE group scored significantly lower on the Vocabulary subtest, and none of the other indexes reliably distinguished LTLE from RTLE patients. The Kaufman 2, 3, and 4 subtest short forms were significant predictors of FSIQ, with the 4 subtest short form having the highest correlation and lowest error of estimate.