Personality development in a Japanese adolescent sample

[Speaker] Kawamoto, Tetsuya:1
1:Graduate School of Education, The University of Tokyo (Japan)

Adolescence is a time for psychological and physical changes, and is important period in investigating human lifelong development. Because previous studies have provided inconsistent findings on personality stability and change in adolescence, the present study examined developmental trends in personality traits with a Japanese adolescent sample. This study used an archival data from the secondary school affiliated with the University of Tokyo (N = 3,656; range 12-18; 1,832 females), collected from 1981 to 2010. Personality traits were assessed by the Yatabe-Guilford Personality Inventory. Latent change score model analyses revealed mean-level increases in Neuroticism related traits and slight mean-level declines in Extraversion related traits. Additionally, this study found significant gender and birth cohort effects on personality. Although the initial levels of personality traits differed according to both factors, the difference scores were different mainly for birth cohort. These findings suggest that personality development may be affected by the sociocultural context.
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