Comparing verbal and nonverbal intellectual functioning with the TONI and WISC-R.

Cognitive ability has long been conceptualized as having verbal and nonverbal components. In this study scores on the Test of Nonverbal Intelligence were correlated with those on the Wechsler Intelligence Scale for Children--Revised for 74 subjects 6 to 15 years old which yielded Pearson values of .55 between the Verbal Scale standard scores and the nonverbal test and .58 with the Performance Scale standard scores and TONI intelligence quotients. Although the TONI has been presented as a nonverbal instrument, the correlations did not support such a view.