S-Space Graduate School of Public Health (보건대학원) Dept. of Public Health (보건학과) Journal Papers (저널논문_보건학과)
Some personality traits converge gradually by long-term partnership through the lifecourse - Genetic and environmental structure of Cloninger's temperament and character dimensions
- Yang, Sarah; Sung, Joohon; Kim, Ji-Hae; Song, Yun-Mi; Lee, Kayoung; Kim, Han-Na; Kim, Hyung-Lae; Cloninger, C. Robert
- Issue Date
- Journal of Psychiatric Research, vol.63, pp. 43-49
- Temperament and Character Inventory (TCI) is a comprehensive personality inventory that is widely
used in behavioral genetics. The original theory suggested that temperament traits were under genetic
influences, whereas character traits were gradually built by an interaction between temperaments and
environment until early adulthood. This study attempted to evaluate TCI by examining the genetic and
environmental contributions to personality with particular attention to spousal effects. From 687 families,
a total of 3459 Korean adult individuals completed the survey. Among them, there were 542
Monozygotic (MZ) twin pairs and 122 Dizygotic twin pairs. Intraclass correlation coefficients (ICCs) and
heritability were calculated to examine the genetic and shared environmental contributions to personality.
Moderate genetic contributions (0.17e0.43) were found for all TCI traits along with the evidence
of shared environment (0.11e0.31) for harm avoidance (HA) and all characters. The ICCs of TCI in MZ
pairs ranged 0.36e0.46. Spouses' had little resemblance for temperament, whereas for character dimensions,
spouses (0.27e0.38) were more similar than first degree relatives (0.10e0.29). Resemblance
between spouses increased with duration of marriage for most characters and HA. When the growing
similarities between spouses were compared with their MZ cotwins' for subgroup of 81 trios, selfdirectedness
(SD) of character showed even more similarities toward their spouses than cotwins as
partnership duration increased (r ¼ 0.32). Our findings with regard to change in SD into late adulthood
support the psychobiological theory of temperament and character, which suggests that both personality
domains have distinct developmental trajectories despite equally large genetic influences.
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