Papers - Kawamoto, Tetsuya

Development and validation of a Japanese translation of the K-SF-42.

Tetsuya Kawamoto, Satoru Kiire, Rachel Zambrano, Mateo Peñaherrera-Aguirre, and Aurelio José Figueredo

PLoS ONE (PLOS)  17 ( 9 ) e0274217 2022.09

Lead author, Corresponding author, Accepted

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In this study, we conducted the translation and validation of the K-SF-42 in Japan (Figueredo, 2017). The K-SF-42 is a new short form of the Arizona Life History Battery. We obtained empirical evidence that the original seven-factor structure could be applied to the Japanese translated version of K-SF-42 (K-SF-42-J). We also observed good internal consistency of the seven scales of K-SF-42-J. The multi-group confirmatory factor analysis findings suggest that the K-SF-42-J can be used in both sexes and diverse age groups. The K-SF-42-J scales showed similar correlates as the English original, with higher scores of other life history strategy measurement, trait emotional intelligence, well-being, and cultural and social resources in childhood. Use of the K-SF-42-J will allow researchers with Japanese speaking samples to integrate their findings with the existing life history strategy research literature. The brevity of the K-SF-42-J will be appealing to researchers who are concerned about taxing the time and motivation of their participants.

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Genetic and environmental correlations between the General Factor of Personality (GFP) and working memory

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

Personality and Individual Differences (Elsevier)  183   111125 2021.12

Lead author, Accepted,  ISSN  01918869

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The present study examines the association between the General Factor of Personality (GFP) and working memory and its etiology with a behavioral genetic approach. The GFP, which explains the common variance among lower-order personality traits, is considered to reflect social effectiveness. Meanwhile, working memory also plays a significant role in social competence. Hence, we expected a substantial association between the GFP and working memory. A total of 253 Japanese twin pairs (124 monozygotic female; 52 monozygotic male; 28 dizygotic female; 17 dizygotic male; and 32 opposite sex twins) were included in the analyses. Phenotypic analyses confirmed a significant positive correlation between the GFP and working memory. Biometric analysis with a bivariate Cholesky decomposition model showed that the phenotypic correlation derived from additive genetic and non-shared environmental correlations. The present findings are in line with social effectiveness account of the GFP.

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The General Factor of Personality as Ego-Resiliency

Curtis S. Dunkel, Dimitri Van Der Linden, Tetsuya Kawamoto, Atsushi Oshio

Frontiers in Psychology (Frontiers)  12 2021.10

Lead author, Accepted

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It was originally hypothesized by Block that what has come to be known as the General Factor of Personality (GFP) reflects ego-resiliency. We test Block’s hypothesis in two studies. In Study 1 a meta-analysis (N = 15,609) examining the relationship between the GFP and ego-resiliency/resilience was conducted. In Study 2 (N = 157) archival data from Block and Block was used to examine the association between rater judged ego-resiliency across childhood, adolescence, and into early adulthood and the GFP based on self-report in early adulthood. Using structural equation modeling for the meta-analytic data, the correlation between the GFP and ego-resiliency/resilience was estimated at r = 0.93. Using a trait-state occasion model to test the hypothesis in Study 2, the correlation between the GFP and rated ego-resiliency was estimated at r = 0.85. The results of the two studies offer substantial support for Block’s original hypothesis. Given the strength of the associations between the GFP and ego-resiliency/resilience one may conclude that the two constructs largely reflect the same underlying phenomenon.

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Genetic and environmental structure of altruism characterized by recipients in relation to personality

Juko Ando, Tetsuya Kawamoto

Medicina (MDPI)  57 ( 6 ) 593 2021.06

Lead author, Accepted,  ISSN  1010660X

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Background and Objectives: Altruism is a form of prosocial behavior with the goal of increasing the fitness of another individual as a recipient while reducing the fitness of the actor. Although there are many studies on its heterogeneity, only a few behavioral genetic studies have been conducted to examine different recipient types: family members favored by kin selection, the dynamic network of friends and acquaintances as direct reciprocity, and strangers as indirect reciprocity. Materials and Methods: This study investigated the genetic and environmental structure of altruism with reference to recipient types measured by the self-report altruism scale distinguished by the recipient (the SRAS-DR) and examine the relationship to personality dimensions measured by the NEO-FFI with a sample of 461 adult Japanese twin pairs. Results: The present study shows that there is a single common factor of altruism: additive genetic effects explain 51% of altruism without a shared environmental contribution. The genetic contribution of this single common factor is explained by the genetic factors of neuroticism (N), extraversion (E), openness to experience (O), and conscientiousness (C), as well as a common genetic factor specific to altruism. Only altruism toward strangers is affected by shared environmental factors. Conclusions: Different types of altruistic personality are constructed by specific combinational profiles of general personality traits such as the Big Five as well as a genetic factor specific to altruism in each specific way.

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Online self-presentation and identity development: The moderating effect of neuroticism.

Tetsuya Kawamoto

PsyCh Journal (Wiley)  10 ( 5 ) 816 - 833 2021.06

Lead author, Accepted

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Using social media, which provides ways to socialize and present oneself, has become normal for young people. Although previous research shows that self-presentation via social media is associated with a sense of identity, little attention has been given to the association with identity-development processes. Therefore, the present study examined these associations while controlling for offline self-presentation and tested the potential moderating effect of neuroticism. A sample of 647 Japanese young adults (401 women; Mean age = 22.70; SD age = 3.25) were recruited to complete an online questionnaire, including measures of identity-development processes, online and offline self-presentation, and neuroticism. A correlation analysis revealed that identity-development processes were associated with online surface-level self-presentation (SSP) but not online inner-level self-presentation (ISP). Further, a moderated regression analysis indicated that the negative associations between online ISP and identity processes were only found among those high in neuroticism. The results of this study suggest that neuroticism may produce variations in young people's identity development.

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Stability and change in psychological distress and early adverse environments in Japanese adults

Tetsuya Kawamoto

Journal of Psychopathology and Behavioral Assessment (Springer)  43 ( 4 ) 822 - 839 2021.04

Lead author, Accepted,  ISSN  08822689

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Research has repeatedly shown that early adversities are a risk factor for psychological distress in adulthood. However, limited research has examined the association between early adversities and intraindividual changes in psychological distress among middle-aged adults. This study developed a self-report scale to retrospectively measure the level of adversity experienced in childhood (Early Environment Scale: EES) and investigated the association between the EES score and the change in psychological distress in middle-aged adults. Study 1 examined the reliability and validity of the nine-item EES using a sample of 337 Japanese adults (162 women; Meanage = 42.96, SDage = 10.55). In Study 2, a three-wave six-month longitudinal survey was conducted with a sample of 2000 Japanese adults (1000 women; Meanage = 40.94; SDage = 5.35). Psychological distress at all three waves was measured with the Kessler Psychological Distress Scale (K-6). The results from a latent growth analysis showed significant positive associations between early adversities and the intercept and slope factors of psychological distress. Specifically, individuals who reported more early adversity showed higher initial levels of psychological distress and a stronger increase in psychological distress among Japanese middle-aged adults. Early adversities might influence the development of dispositional sensitivity for psychological distress in adulthood.

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The General Factor of Personality (GFP), trait emotional intelligence, and problem behaviors in Japanese teens

Tetsuya Kawamoto, Aiko Komoto Kubota, Ryota Sakakibara, Sera Muto, AkikoTonegawa, Sahoko Komatsu, Toshihiko Endo

Personality and Individual Differences (Elsevier)  171   110480 2021.03

Lead author, Accepted,  ISSN  0191-8869

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© 2020 Elsevier Ltd This study examined associations of the General Factor of Personality (GFP) with trait emotional intelligence (EI) and emotional and behavioral problems in Japanese children and adolescents. We used self- and parent-rated personality data to extract the two GFPs using the Ten Item Personality Inventory. Participants were 10,357 Japanese children and adolescents (M = 13.99 years; SD = 2.53; range 9–18; 5177 boys, 5168 girls, 12 unknown). Correlational and multiple regression analyses revealed that the two GFPs were significantly associated with trait EI. However, the association between the self-rated GFP and trait EI was weaker than previously reported. The GFPs were also associated with emotional and behavioral problems in children and adolescents above and beyond trait EI. These findings support the notion that the GFP reflects social effectiveness and imply differences in the GFP-trait EI association between youths and adults.

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Maternal prenatal stress and infantile wheeze and asthma: The Osaka Maternal and Child Health Study

Tetsuya Kawamoto, Yoshihiro Miyake, Keiko Tanaka, Jun Nagano, Satoshi Sasaki, Yoshio Hirota

Journal of Psychosomatic Research (Elsevier)  135   110143 - 110143 2020.08

Lead author, Accepted,  ISSN  0022-3999

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Association between sibling composition in the family of origin and moral foundations in adulthood.

Tetsuya Kawamoto

Journal of Adult Development (Springer)  28 ( 1 ) 64 - 75 2020.06

Lead author, Accepted,  ISSN  10680667

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Considerable research has been performed on the association between sibling composition and various characteristics, including personality, intelligence, and social attitudes. These studies suggest that birth order among siblings could weakly but significantly affect the development of personality traits and intelligence. However, few studies on the association between sibling composition and moral foundations have been conducted. Therefore, the present study investigated whether sibling composition (only child, firstborn, laterborn) is related to moral values with a between-family design. A sample of 500 Japanese adults (250 women) completed the self-administered online questionnaire. The mean age was 45.42 years (SD = 8.53, range = 20–60, median = 46). The general linear model was used to test the association between sibling composition and moral values. The results showed no differences in five moral foundation and two higher-order moral dimension scores between firstborns and laterborns. However, only children scored lower on care/harm, fairness/cheating, and individualizing foundation than laterborns. This finding might indicate that growing up with their siblings positively affects the development of care/harm and fairness/cheating (individualizing foundation) regardless of one's position among those siblings.

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Stability and change in academic interest: A panel survey of students in a secondary school in Tokyo metropolitan area

Tetsuya Kawamoto, Ichiro Hidaka, Eriko Arai

東京大学院教育研究科附属学校教育高度化・効果検証センター研究紀要 5   76 - 93 2020.03

Research paper (bulletin of university, research institution), Joint Work, Lead author

The autonomous inquiry-based learning and its effects among students in a secondary school in Tokyo metropolitan area: The moderation effect of self-esteem

Tetsuya Kawamoto

東京大学大学院教育学研究科紀要 59   517 - 526 2020.03

Research paper (bulletin of university, research institution), Single Work, Lead author

Cross-Sectional Age Differences in the Dark Triad Traits in Two Japanese Samples

Tetsuya Kawamoto, Tadahiro Shimotsukasa, Atsushi Oshio

PSYCHOLOGY AND AGING (AMER PSYCHOLOGICAL ASSOC)  35 ( 1 ) 91 - 96 2020.02

Lead author, Accepted,  ISSN  0882-7974

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This study investigated the age differences in the Dark Triad (DT) traits with 2 independent samples. Personality was measured using the Short Dark Triad and the Dark Triad Ditty Dozen. Results showed a significant negative correlation between age and DT traits except for narcissism, which differed between the samples. Significant age-by-sex interaction effects were observed for Macitiavellianism and the DT composite score, indicating that women showed a steeper downward age trend in dark personalities.

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The moderating role of attachment style on the relationship between self-concept clarity and self-esteem

Tetsuya Kawamoto

Personality and Individual Differences 152   109604 2020.01

Lead author, Accepted

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Psychosocial Twin Cohort Studies in Japan: The Keio Twin Research Center (KoTReC)

Juko Ando, Keiko K. Fujisawa, Kai Hiraishi, Chizuru Shikishima, Tetsuya Kawamoto, Mari Nozaki, Shinji Yamagata, Yusuke Takahashi, Kunitake Suzuki, Yoshiaki Someya, Koken Ozaki, Minako Deno, Mami Tanaka, Shoko Sasaki, Tatsushi Toda, Kazuhiro Kobayashi, Masamichi Sakagami, Mitsuhiro Okada, Nobuhiko Kijima, Ryu Takizawa, and Kou Murayama

Twin Research and Human Genetics (Cambridge University Press)  22 ( 6 ) 591 - 596 2019.12

Lead author, Accepted,  ISSN  1832-4274

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The Keio Twin Research Center (KoTReC) was established in 2009 at Keio University to combine two longitudinal cohort projects - the Keio Twin Study (KTS) for adolescence and adulthood and the Tokyo Twin Cohort Project (ToTCoP) for infancy and childhood. KoTReC also conducted a two-time panel study of self-control and psychopathology in twin adolescence in 2012 and 2013 and three independent anonymous cross-sectional twin surveys (ToTcross) before 2012 - the ToTCross, the Junior and Senior High School Survey and the High School Survey. This article introduces the recent research designs of KoTReC and its publications.

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Moral foundations and cognitive ability: Results from a Japanese sample

Tetsuya Kawamoto, Takahiro Mieda, Atsushi Oshio

Personality and Individual Differences 149   31 - 36 2019.10

Lead author, Accepted,  ISSN  0191-8869

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© 2019 Elsevier Ltd Research has indicated that human morality is associated with cognitive ability. However, morality is not a unified concept but rather is a multi-faceted concept. Moral Foundation Theory suggests that human beings have at least five innate moral foundations: Care/Injury, Fairness/Deception, Loyalty/Betrayal, Authority/Subversion, and Sacred/Fallen. The present study aimed to investigate the associations between these moral values and cognitive ability. A large-scale cross-sectional survey was conducted online, which was completed by a total of 4863 Japanese adults (2922 females, 1935 males, and 6 “other;” Mage = 48.78, SDage = 10.93, range 20–70). Correlation and multiple regression analyses revealed that cognitive ability was positively linked to Care/Injury, Fairness/Deception, and Sacred/Fallen. Notably, the positive associations of cognitive ability with Loyalty/Betrayal and Authority/Subversion were statistically significant only for people below the age of approximately 50. These findings indicate that although moral foundations are based on emotions and intuitions, they are substantially associated with cognitive ability. In addition, the positive direction of associations of cognitive ability with Loyalty/Betrayal and Authority/Subversion was inconsistent with previous findings in Western countries, which suggests that these associations are culture-dependent.

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Personality change in middle adulthood: With focus on differential susceptibility

Tetsuya Kawamoto

The Journal of Psychology: Interdisciplinary and Applied  2019.07

Lead author, Accepted

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Smokers Are Extraverted in Japan: Smoking Habit and The Big Five Personality Traits

Abe Shingo, Oshio Atsushi, Kawamoto Tetsuya, Ito Hiroyuki, Hirashima Taro, Tsubota Yuki, Tani Iori

SAGE Open July-September 2019   1 - 6 2019.07

Lead author, Accepted

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Sources of variances in personality change during adolescence

Tetsuya Kawamoto, Toshihiko Endo

Personality and Individual Differences 141   182 - 187 2019.04

Lead author, Accepted

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Age and gender differences of academic interest in Japanese adolescents: Data from a baseline survey in a secondary school in Tokyo metropolitan area

Tetsuya Kawamoto, Ichiro Hidaka, Shotaro Umehara

東京大学院教育研究科附属学校教育高度化・効果検証センター研究紀要 4   92 - 106 2019.03

Research paper (bulletin of university, research institution), Joint Work, Lead author

Early childhood social responsiveness predicts the general factor of personality in early adolescence.

Dunkel Curtis S, Van der Linden Dimitri, Kawamoto Tetsuya

Infant and Child Development  2019

Lead author, Accepted

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