Causes are not yet well-understood. Genes play a significant role (approximately 50%), but the unique ways that environments shape people (e.g., peer interactions) also influence narcissism. Related hypotheses include:
- Heritable narcissistic traits emerged in part due to natural selection for promiscuous sexuality.
- Some people develop into narcissists because of self-reflection on largely heritable traits-"I am attractive and therefore I deserve special treatment."
- Cultural factors may bring-about narcissistic qualities (e.g., watching narcissistic role models on TV; adverse, war-torn environments).
Narcissistic Personality Disorder. Last reviewed 01/15/2010
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