MMPI profiles of monozygotic and dizygotic twin pairs.

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Abstract
In an effort to obtain more quantifiable and objective data on the potential contribution of genetic factors to personality characteristics, Gottesman (1963) employed psychological tests in assessing pairs of fraternal and identical high school age twins. The present study represented a further attempt at more precise evaluation of personality parameters in twins, this time examining an adult population. The procedure entailed administration of an IBM card form of the MMPI to 18 monozygotic (MZ) and 16 like-sexed dizygotic (DZ) twin pairs. The intraclass correlations for 9 of the 14 MMPI scales were significantly different from zero for the MZ twins, while only 2 reached significance in the DZ group. The MZ intraclass correlations were larger than the corresponding correlations for the DZ twins on all but three scales--K, Pd, and Es. While Gottesman found significant H's on the D, Pd, and Si scales, the H's that attained significance in the current study were on the Hs and Mf scales. The overall results confirm Gottesman's impression that genetic influences appear to be operant in some aspects of personality, at least as measured by a self-descriptive personality inventory. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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