Twin study of personality

Juko Ando

Research output: Chapter in Book/Report/Conference proceedingChapter


The term personality is understood as trait factors in a narrow sense, such as the Big Five, from a broader psychological perspective, as any kinds of individual dimensions other than cognitive abilities. Twin studies investigating the genetic and environmental influence of personality reveal common and robust results concerning personality; additive genetic and nonshared environmental factors are the main sources of variations in most personality traits, nonadditive genetic (genetic contribution explained not by the simple addition of related genes but by combinational and interactional effects of multiple genes) and shared environmental effects are relatively rare if not negligible at all. The structures of personality traits are also explained as genetic structure universally from the top general factor to each item level. Developmental genetic contribution to personality tends to decrease throughout life. Other-related traits such as social behavior (political, economic, religious, criminal) have also been investigated. Two elegant applications of twin methodology, the discordant twin method, direction of causation model were introduced.

Original languageEnglish
Title of host publicationTwin Research for Everyone
Subtitle of host publicationFrom Biology to Health, Epigenetics, and Psychology
Number of pages14
ISBN (Electronic)9780128215142
ISBN (Print)9780128215159
Publication statusPublished - 2022 Jan 1


  • Direction of causation model
  • Discordant identical twins
  • Higher-order personality factors
  • Personality traits
  • Social behavior
  • The Big Five

ASJC Scopus subject areas

  • General Medicine
  • General Biochemistry,Genetics and Molecular Biology


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