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Behav Res Ther. 1993 Jul;31(6):569-74.

Is optimism heritable? A study of twins.

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  • 1Department of Psychology, University of Pennsylvania, Philadelphia 19104-6196.

Abstract

Is optimism heritable? We gave the Attributional Style Questionnaire (ASQ), a measure of optimism, to 115 monozygotic twin pairs (MZ) and 27 dizygotic twin pairs (DZ). The intraclass correlations of the ASQ scores were 0.48 for MZ twins (P < 0.0001) and 0 for DZ twins. Though the sample size of DZ twins is small, these results suggest that there may be a substantial genetic effect on optimism. We speculate, however, that the mechanism for the transmission of this, and other complex personality traits, may be highly indirect.

PMID:
8347115
[PubMed - indexed for MEDLINE]
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