Neuropsychological Performance, IQ, Personality, and Grades in a Longitudinal Grade-School Male Sample
Author(s): Jordan B. Peterson, Robert O. Pihl, Daniel M. Higgins, Jean R. Séguin, Richard E. Tremblay
Abstract: This study assessed the statistical relationship between neuropsychological performance, IQ and personality test results and school grades in a longitudinal sample of adolescent males. One-hundred and forty-eight boys completed six years of WISC-R short forms (Block Design and Vocabulary) and provided six years of math and language grades and grade failure data while in elementary school. In junior high school, the same boys completed an extensive neuropsychological test battery and the NEO-PI-R, a standard big five personality trait measure. Neuropsychological test scores were more powerfully associated with grades than were IQ scores, despite their later and single administration. In addition, hierarchical regression analysis demonstrated that three of four neuropsychological test score factors (Verbal Learning, Executive Function, and Tactile Laterality improved the statistical association with six-year averaged failure-weighted grades over and above IQ (averaged Vocabulary and Block Design). NEO-PI-R Agreeableness was significantly and positively related to grades, over and above both IQ and neuropsychological function.
Pages: 159-172
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