Is Narcissism heritable and is it increasing?
A study of 304 sets of twins examined genetic and environmental bases of two dimensions of narcissism: intrapersonal grandiosity and interpersonal entitlement. Study reports indicated: We are living in a narcissistic age. Narcissists attach superfluous importance and excellence to themselves at the same time they enjoy exploiting and manipulating others. Both grandiosity (23 percent) and entitlement (35 percent) were found to be moderately heritable, while simultaneously showing considerable non-shared environmental influences, meaning they were largely independent of each other in terms of their genetic and environmental sources. There is some sense that this disorder is increasing, partly perhaps because some think this is a Narcissistic Age--with competitive emphasis on individuals. The behavior typically begins by late adolescence or early adulthood and occurs across a variety of social situations.
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