This study examined the correlations between academic achievement and two tests of none verbal intelligence often used with the deaf population, the Hiskey-Nebraska Test of Learning Aptitude (H-NTLA) and the Wechsler Adult Intelligence Scale-Revised (WAIS-R) Performance Scale, in a sample of 35 deaf high school students. Both tests correlated significantly positively with measures of reading comprehension and mathematical calculation and were, in fact, in the same range as typical correlations between overall IQ and achievement in the hearing population. The WAIS-R Performance Scales correlated significantly higher with reading comprehension than did the H-NTLA. The results seem to validate the use of the WAIS-R as a predictor of academic achievement and a potential aid in identifying learning problems in the deaf population.
Paal, N., Skinner, S., & Reddig, C. (1988). The Relationship of Non-Verbal Intelligence Measures to Academic Achievement Among Deaf Adolescents. JADARA, 21(3). Retrieved from https://nsuworks.nova.edu/jadara/vol21/iss3/5