LATE IN 1986, the Minnesota group had completed assembling its data for a major paper, the concordances of a broad range of personality traits between sets of separated twins, now totaling forty-four. The paper also included data on 331 reared-together twins, 217 identical and 114 fraternal. A trait that showed one of the highest levels of heritability, .60, was traditionalism, or a willingness to yield to authority. The only one of these traits to show a higher heritability was social potency, which included such characteristics as assertiveness, drive for leadership, and a taste for attention. A surprisingly high genetic component—a .55 concordance—was found in the ability to be enthralled by an esthetic experience ...

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