German study finds genetics explain half of narcissism variation, family environment minimal
A German study of over 6,700 twins and relatives found that genetic factors explain about half of the differences in narcissism, even as shared family environment had minimal influence. Genetics account for half of narcissism variation Researchers from the universities of Münster and Bielefeld analyzed data from the TwinLife project, comparing identical and fraternal twins, … Weiterlesen …