Details of a Researcher - Kawamoto, Tetsuya

Papers - Kawamoto, Tetsuya

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Why do adolescents show self-destructive behavior?:Comment on MATSUKI and SAITO (2017)

KAWAMOTO Tetsuya

The Japanese journal of adlescent psychology (日本青年心理学会) 30 ( 1 ) 53 - 57 2018

Lead author, Accepted, ISSN 0915-3349

The General Factor of Personality (GFP) and moral foundations

Tetsuya Kawamoto, Dimitri Van der Linden, Curtis S. Dunkel

PERSONALITY AND INDIVIDUAL DIFFERENCES (PERGAMON-ELSEVIER SCIENCE LTD) 119 78 - 82 2017.12

Lead author, Accepted, ISSN 0191-8869

The present study examined whether the General Factor of Personality (GFP) is associated with moral foundations. The GFP represents the shared variance among lower-level personality traits and is assumed to reflect social effectiveness. We compare two contrasting hypotheses regarding the associations between the GFP and moral values. The social effectiveness view suggests relative independence of the two constructs, whereas, based on Life History theory, relevant associations would be expected. Two samples of Japanese adults participated in this study online. The first sample (Sample 1) consisted of 500 Japanese (M = 45.42 years; SD = 8.53; range 20-60; 250 women), and the second sample (Sample 2) of 487 Japanese (M = 41.13 years; SD = 10.08; range 20-60; 244 women). The GFP was found in the HEXACO-60 in Sample 1 and was extracted from the NEO-FFI in Sample 2. Correlational and multiple regression analyses revealed that the GFP was modestly, yet significantly associated with Ingroup/Loyalty which refers to individual differences in trueness, patriotism, and self-abnegations for ones group members. The GFP was not substantially associated with the other moral foundations. These findings indicate the relative independence of the GFP from moral values, which is more congruent to the social effectiveness view. (C) 2017 Elsevier Ltd. All rights reserved.

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Secular Trends in the Development of Health-Related Physical Fitness in Japanese Adolescents

川本哲也, 遠藤利彦

発達心理学研究 = The Japanese journal of developmental psychology (日本発達心理学会) 27 ( 4 ) 379 - 394 2016.12

Lead author, Accepted, ISSN 0915-9029

Cross-sectional age differences in the HEXACO personality: Results from a Japanese sample

Tetsuya Kawamoto

JOURNAL OF RESEARCH IN PERSONALITY (ACADEMIC PRESS INC ELSEVIER SCIENCE) 62 1 - 5 2016.06

Lead author, Accepted, ISSN 0092-6566

Little research has been conducted on personality development in non-Western countries. The present study investigated age differences in personality in Japanese middle adults (N = 2000; M = 40.94 years; SD = 5.35, range 30-49; 1000 women). After controlling for educational level, annual income, marital status, and gender, it was found that the level of Emotionality was negatively associated with age. Honesty-Humility, on the other hand, was positively associated with age. However, Extraversion, Agreeableness, Conscientiousness, and Openness were not associated with the participant age. These findings suggest that trends in personality development may differ slightly between Western and non-Western countries. (C) 2016 Elsevier Inc. All rights reserved.

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Personality Change from Life Experiences: Moderation Effect of Attachment Security

Tetsuya Kawamoto

JAPANESE PSYCHOLOGICAL RESEARCH (WILEY-BLACKWELL) 58 ( 2 ) 218 - 231 2016.04

Lead author, Accepted, ISSN 0021-5368

This study focused on effects of life experiences on change in personality and moderation effects of attachment security on the life experience influences. With a sample of Japanese university students (N = 1,000; 679 female; M = 19.72; SD = 1.26; age range, 18-25 years), the Big Five personality traits were assessed twice. The assessment interval was 20 weeks. Hierarchical linear modeling (HLM) analyses revealed that there were large between-individual differences in change and stability of the Big Five personality traits, which were accounted for by the amount of daily positive and negative life experiences during the interval period. Moreover, multi-group HLM analyses indicated that the life experience effects were moderated by participants' attachment security at Time 1. These findings suggest that the accumulation of small daily experiences may work for the personality development of university students and that environmental influences may vary by individual susceptibility to experiences, like attachment security.

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Socioemotional Development through Experiential Activities in University Students : Focusing on Emotion Regulation

川本哲也, 榊原良太, 村木良孝

発達心理学研究 = The Japanese journal of developmental psychology (日本発達心理学会) 27 ( 1 ) 32 - 46 2016.03

Lead author, Accepted, ISSN 0915-9029

The purpose of this study was to explore University of Tokyo students' socioemotional development in relation to their experiential activities. Participants were 276 university students (164 males, 106 females, 6 unreported). Their mean age at the time of first assessment was 20.46 years (SD＝1.43, Median＝20, range 18–27). Personality traits, sense of coherence, and emotion regulation strategies were assessed, and analyses were conducted for rank-order stability, mean-level change, and individual differences in change of students' personality traits and sense of coherence. The results showed that rank-order stability was relatively high. As for mean-level change, scores for extraversion and sense of coherence increased significantly. In addition, individual differences in changes of these traits were accounted by students' emotion regulation strategies. Specifically, students using more positive reappraisal strategies showed more increase in their extraversion scores. In contrast, students using more acceptance strategies showed more decline in extraversion. These findings indicate that extracurricular activities like experiential activities may have effects on the socioemotional development of university students.

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Development of Japanese version of the long-term mating orientation scale (LTMO-J)

Tetsuya Kawamoto

JAPANESE PSYCHOLOGICAL RESEARCH (WILEY-BLACKWELL) 57 ( 4 ) 323 - 336 2015.10

Lead author, Accepted, ISSN 0021-5368

The purpose of this study was to validate the 7-item long-term mating orientation scale (LTMO) as translated into Japanese. Two samples of Japanese adults (N=2000; 50.0% male; Mage=40.9 for the first survey; N=300; 54.7% male; Mage=42.4 for the second survey) completed a web-based questionnaire, including the Japanese translation of the LTMO. The results showed that the psychometric properties of the Japanese LTMO scale were comparable to those of the original English version. The scale had adequate reliability based on Cronbach's and McDonald's . Convergent validity was demonstrated by the correlation between the LTMO scores and related variables: human life history strategies, short-term sociosexual orientation, attitude to infidelity, romantic attachment style, and so on. The translated scale provides a valid and reliable instrument in Japanese that measures human mating strategy.

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Genetic and Environmental Contributions to Personality Trait Stability and Change Across Adolescence: Results From a Japanese Twin Sample

Tetsuya Kawamoto, Toshihiko Endo

TWIN RESEARCH AND HUMAN GENETICS (CAMBRIDGE UNIV PRESS) 18 ( 5 ) 545 - 556 2015.10

Lead author, Accepted, ISSN 1832-4274

We examined developmental trends and sources of stability and change in adolescent personality by using twin data collected from 1981 to 2010 (273 monozygotic (MZ) and 48 dizygotic (DZ) twin pairs) from a secondary school affiliated with the University of Tokyo. Phenotypic analyses showed high rank-order stability and substantial mean-level increases in neuroticism and declines in extraversion over the adolescent years. Longitudinal bivariate genetic analyses revealed that the best-fitting model for adolescent personality includes additive genetic and non-shared environmental influences. Heritability estimates ranged approximately from 0.30 to 0.60. Additionally, three-year stability in adolescent personality was influenced mainly by genetic factors, and there were both genetic and environmental innovations in mid-adolescence. Our findings suggest that both genetic and environmental effects have significant roles in the etiology of personality development across adolescence.

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Personality change in adolescence: Results from a Japanese sample

Tetsuya Kawamoto, Toshihiko Endo

JOURNAL OF RESEARCH IN PERSONALITY (ACADEMIC PRESS INC ELSEVIER SCIENCE) 57 32 - 42 2015.08

Lead author, Accepted, ISSN 0092-6566

We examined developmental trends in personality traits during adolescence by using data from the secondary school affiliated with the University of Tokyo (N = 3656; range 12-18; 1832 female), collected from 1981 to 2010. Hierarchical linear modeling analyses revealed cumulative mean-level changes in personality averaging approximately 1 SD across adolescence. Scales related to Neuroticism showed linear increases, and those related to Extraversion showed distinct developmental patterns: General Activity and Rhathymia did not change, while Ascendance and Social Extroversion declined. Additionally, we found significant gender and birth cohort effects on personality. Although the intercepts differed according to both factors, the trajectories were different only for the birth cohort. These findings suggest that personality development trajectories differ according to the sociocultural context. (C) 2015 Elsevier Inc. All rights reserved.

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The translation and validation of the Mini-K scale in Japanese

Tetsuya Kawamoto

JAPANESE PSYCHOLOGICAL RESEARCH (WILEY-BLACKWELL) 57 ( 3 ) 254 - 267 2015.07

Lead author, Accepted, ISSN 0021-5368

The purpose of this study was to validate the 20-item Mini-K scale, which is the short form of the Arizona Life History Battery, as translated into Japanese. Two samples of Japanese adults (N=2000; 50.0% men; Mage=40.9 for the first survey; N=400; 50.0% men; Mage=42.2 for the second survey) completed a web-based questionnaire, including the Japanese translation of the Mini-K. The results showed that the psychometric properties of the Japanese Mini-K scale were comparable to those of the original English version. The scale had good reliability based on Cronbach's and McDonald's . Convergent validity was demonstrated by the correlation between the Mini-K scores and life history indicators. In addition, the Mini-K score was related to both personality and psychosomatic health. The translated scale provides a valid and reliable instrument in Japanese that measures human life-history strategy.

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Age and Gender Differences of Big Five Personality Traits in a Cross-Sectional Japanese Sample

川本哲也, 小塩真司, 阿部晋吾

発達心理学研究 (日本発達心理学会) 26 ( 2 ) 107 - 122 2015.06

Lead author, Accepted, ISSN 0915-9029

This study explored the effects of age and gender on the mean levels of Big Five personality traits in Japanese adulthood. The data for the present study were drawn from a large cross-sectional study. The participants were 4,588 adults (2,476 women, M age＝53.5 years, SD age＝12.9, age range: 23–79 years), and the analyzed measure was a Japanese version of the Ten-Item Personality Inventory (TIPI-J; Oshio, Abe, & Cutrone, 2012). Multiple regression analyses were carried out to determine the effects of age, gender, and the interaction between the two on each Big Five scale. Age differences were found suggesting that agreeableness and conscientiousness are positively associated with age. Gender differences were also found suggesting that females have higher levels of extraversion, while males are more open to experience. An Age×Sex effect was confirmed only on neuroticism, indicating that younger females' level of neuroticism is significantly higher than males, but older females' level is lower and is at the same level as males.

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The Association between Emerging Adult Identity and Multiple Social Relationships: Differences among Attachment Styles with Parents, Friends, and Romantic Partners

Kawamoto Tetsuya

JJDP (一般社団法人日本発達心理学会) 26 ( 3 ) 210 - 224 2015

Lead author, Accepted, ISSN 0915-9029

This study explored the association between multidimensional identity and multiple social relationships in emerging adults. Participants were 385 students (210 men, 175 women, M＝22.4, SD＝2.4, range: 18–29 years). Identity was assessed with the Multidimensional Ego Identity Scale (Tani, 2001). Attachment to their parents, friends, and romantic partners were assessed as the key social relationships of the participants, by the Experiences in Close Relationship Questionnaire-Revised (Fraley, Waller, & Brennan, 2000). The effects of age, gender, and social relationships on each identity dimension were estimated as follows by structural equation modeling. Attachment to parents had an effect on the Self-Sameness and Continuity dimension; age had an effect on the Self Identity dimension; attachment to friends and romantic partners had an effect on the Interpersonal Identity dimension; and age and attachment to friends had an effect on the Psychosocial Identity dimension. These results indicate that the internal aspect of identity is associated with one's relationships to parents, while the social aspect of identity is associated with relationships to friends and romantic partners.

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Cohort Effects on the Development of Performance Intelligence in Adolescence

Kawamoto Tetsuya, Endo Toshihiko

JJDP (一般社団法人日本発達心理学会) 26 ( 2 ) 144 - 157 2015

Lead author, Accepted, ISSN 0915-9029

The purpose of this study was to explore the development of adolescent intelligence and cohort effects on their intelligence. Data for the study were drawn from the archival data of the secondary school attached to the University of Tokyo's Faculty of Education. Participants were 3,841 adolescents (1,920 females, M＝12.21 years, SD＝0.49; range 12–17), and the analyzed measure was the Tanaka B Intelligence Test - New Edition (Tanaka, 1953). Structural change, rank-order stability, and mean-level change of adolescents' intelligence were analyzed. The results showed that the structure of intelligence was highly consistent through adolescence and that rank-order stability was comparable to that found in previous research. As for mean-level change, adolescents' intelligence scores increased linearly and birth cohort had a statistically significant effect on the mean and slope of change. However, the directions of the effects were inconsistent. Later-born cohorts showed an increase of the mean and slope in the perception-related domain. On the other hand, these cohorts also showed a decline in their capacity to grasp the objects' relationships.

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