Findings from a study printed in the journal Social Psychological and Personality Science indicate that narcissism—a character trait characterized by a dominant sense of self-importance and a drive for high social standing—is typically inherited.
The research involved 6,715 individuals: identical and fraternal twins, their siblings, parents, and partners. Scientists utilized data gathered from the German TwinLife project for this purpose. Participants spanning various ages (approximately 15, 21, and 27 years old) completed a questionnaire designed to gauge narcissistic tendencies. For instance, the adolescent questionnaire included inquiries about feelings of uniqueness and the desire to dominate others, while the adult version focused on the craving for admiration and prestige.
Experts juxtaposed the similarity of traits across relatives with varying degrees of genetic overlap. It was discovered that genetic factors account for approximately 50% of the variance in narcissism, with the remaining 50% stemming from unique, individual social experiences.
Intriguingly, the shared family environment—including parenting styles, socioeconomic status, etc.—exerted almost no influence on the development of this characteristic. Identical twins showed significantly greater similarity in their narcissism levels compared to fraternal twins, who share only half of their genetic makeup.
Furthermore, the researchers observed assortative mating: parents exhibited similar levels of narcissism, meaning they tended to select partners possessing comparable traits. This pattern further elevates the likelihood of transmitting biological markers to their offspring. The impact of genetics versus individual experience remained consistent across all age cohorts studied.
Although the subjective nature of self-reported questionnaires introduces a degree of bias, scientists conclude that narcissism within families is definitively linked more strongly to genetics than to upbringing.
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