国際誌論文データベース

Neff, K. D., & Miyagawa, Y.(宮川裕基) (2026).
Self-Compassion Scale.
セルフ・コンパッション尺度
In Singh, N.N. (eds.) Encyclopedia of Mindfulness, Buddhism, and Other Contemplative Practices. Springer. 
https://doi.org/10.1007/978-3-030-90465-4_169-1

The 26-item Self-Compassion Scale and a 12-item short version assess trait self-compassion as a multidimensional construct comprising six interrelated components: self-kindness, common humanity, mindfulness, self-judgment, isolation, and overidentification.

特性版のセルフ・コンパッション尺度(Self-Compassion Scale)とその短縮版 (Self-Compassion Scale Short Form) に関する作成過程や、これらの尺度の妥当性を検証した研究についての簡単なまとめです。

Miyagawa, Y. (宮川裕基), Zhang, J. W., Kanemasa, Y. (金政祐司), Komura, K.(古村健太郎), & Taniguchi, J. (谷口淳一). (2026).
A longitudinal and dyadic examination of self-compassion and relationship quality in Japanese couples. Mindfulness.
縦断調査およびペア調査を用いたセルフ・コンパッションと親密な関係性の質に関する検討
Advance online publication. 
https://doi.org/10.1007/s12671-025-02737-y

Objectives
Past research has suggested that self-compassion fosters interpersonal functioning in Western samples. We extended previous findings by employing a longitudinal (Study 1) and a dyadic (Study 2) design in Japan. We hypothesized that self-compassion would predict higher relationship satisfaction and lower psychological intimate partner violence (IPV) beyond self-esteem.

Methods
Study 1 examined longitudinal associations using three-wave data across 6 months from 1,021 individuals involved in romantic relationships. Study 2 examined dyadic associations using cross-sectional dyadic data from 406 married couples. These participants completed the scales of self-compassion, self-esteem, relationship satisfaction, and psychological IPV perpetration (Study 1) and victimization (Study 2).

Results
A cross-lagged panel model in Study 1 indicated that self-compassion prospectively predicted lower psychological IPV perpetration (averaged β = -0.05). This model also revealed a bidirectional association between self-compassion (averaged β = 0.05) and relationship satisfaction (averaged β = 0.04). An actor-partner interdependence model in Study 2 indicated actor effects of self-compassion on own relationship satisfaction (β = 0.16, p < 0.001) and psychological IPV victimization (β = -0.09, p = 0.04). Importantly, we found that actors’ self-compassion was positively associated with partners’ relationship satisfaction (β = 0.12, p = 0.02) and negatively associated with partners’ psychological IPV victimization (β = -0.19, p < 0.001). These results were independent of self-esteem.

Conclusions
Self-compassion appears to help individuals have a satisfying relationship and avoid perpetrating psychological violence toward relationship partners in romantic and married couples in Japan.

Preregistration
This study is not preregistered.

Miyagawa, Y. (宮川裕基) (2026).
How self-compassion promotes authentic self-expression: The role of self-concept clarity. 
セルフ・コンパッションは真正の自己表現を促す―自己概念の明確性を介した過程―
Journal of Happiness Studies, 27, 1. 
https://doi.org/10.1007/s10902-025-00985-2

Three studies (n = 1,581) investigated whether self-compassion enables individuals to achieve high levels of state self-concept clarity, thereby facilitating authentic self-expression toward others. These studies also explored the relation of self-compassion to inauthentic self-expression. Study 1 utilized scenarios in which individuals were unsure about what others were thinking. Study 2 focused on participants’ actual experiences of such situations. Study 3 implemented an experimental manipulation of self-compassion in the situations. Across three studies, individuals with high self-compassion reported higher state self-concept clarity and authentic self-expression. State self-concept clarity consistently mediated the positive association between self-compassion and authentic self-expression, independent of state self-esteem as a parallel mediator. The relation of self-compassion to inauthentic self-expression was not consistently found. This study indicates that self-compassion promotes state self-concept clarity and authentic self-expression toward others. State self-concept clarity elucidates the mechanism through which self-compassion facilitates authentic self-expression.

Miyagawa, Y. (宮川裕基) & Taniguchi, J. (谷口淳一). (2026). 
Dyadic associations among interpersonal goals, self-expression, and relationship satisfaction in marital relationships in Japan.
婚姻関係における、対人目標、自己表現、関係満足度の関連性
Current Psychology, 48, 28. 
https://doi.org/10.1007/s12144-025-08830-8

The ecosystem and egosystem motivational perspective of relationships posits that individuals pursue four interpersonal goals that affect both intrapersonal and interpersonal experiences. This study examined whether the four interpersonal goals (compassionate goals, and competent, likable, and avoidant self-image goals) are associated with authentic self-expression, inauthentic self-expression, and relationship satisfaction. A total of 406 heterosexual married couples in Japan completed measures of interpersonal goals, self-expression, and relationship satisfaction. The actor-partner interdependence model revealed the within-individual relations among the variables. Specifically, compassionate goals were positively associated with authentic self-expression, inauthentic self-expression, and relationship satisfaction. Likable self-image goals were positively associated with inauthentic self-expression. Avoidant self-image goals were negatively associated with authentic self-expression and positively with inauthentic self-expression. Furthermore, we found the between-individual relations of individuals’ compassionate goals to their partners’ authentic self-expression and relationship satisfaction. Overall, this study aligns with the ecosystem and egosystem motivational perspective and highlights that individuals’ interpersonal goals orient their own and their partners’ self-expression and relationship satisfaction.

Sasaki, T., Uchida, S., Okada, I.(岡田勇), Yamamoto, H.(山本仁志), & Nakai, Y. (2026). 
Integrating upstream and downstream reciprocity stabilizes cooperator-defector coexistence in others-only public goods games.
他者限定公共財ゲームにおける上流・下流互恵性の統合と協力者・非協力者の共存安定化
Frontiers in Behavioral Economics, 4(January), 1–10.

Introduction: Human cooperation persists among strangers in large, well-mixed populations despite theoretical predictions of difficulties, leaving a fundamental evolutionary puzzle. While upstream (pay it forward: helping others because you were helped) and downstream (rewarding reputation: helping those with good reputations) indirect reciprocity have been independently considered as solutions, their joint dynamics in multiplayer contexts remain unexplored. Methods: We study public goods games (PGGs) without self-return (often called “others-only” PGGs) with benefit b and cost c and analyze evolutionary dynamics for three strategies: unconditional cooperation (X), unconditional defection (Y), and an integrated reciprocal strategy (Z) combining unconditional forwarding with reputation-based discrimination. Results: We show that integrating upstream and downstream reciprocity can yield a globally asymptotically stable mixed equilibrium of unconditional defectors and integrated reciprocators when the benefit-to-cost ratio exceeds a threshold (b/c > 2) in the absence of complexity costs. We analytically derive a critical threshold for complexity costs. If cognitive demands exceed this threshold, the stable equilibrium disappears via a saddle-node bifurcation. Otherwise, within the stable regime, complexity costs counterintuitively stabilize the equilibrium by preventing not only unconditional cooperators (viewed as second-order freeloaders) but also alternative conditional strategies from invading. Discussion: Rather than requiring uniformity, our model reveals one pathway to stable cooperation through strategic diversity, where defectors serve as “evolutionary shields” preventing system collapse, while integrated reciprocators flexibly combine open and discriminative responses. This framework demonstrates how pay-it-forward broadcasting and reputation systems can jointly maintain social polymorphism including cooperation despite cognitive limitations and group size challenges, offering a potential evolutionary foundation for behavioral diversity in human societies.

Luo, X., Zhou, Z., Yang, F.（楊帆）, Wang, Y., Ren, M., & Zhou, L. (2026).
When protection leads to insecurity: Examining the cross-lagged relationship between overparenting and attachment style.
保護も不安定さを招くことがある：過干渉な養育と愛着スタイルの交差遅延関係の検討
Asian Journal of Social Psychology. Advance online publication.
https://doi.org/10.1111/ajsp.70079

Adolescence marks an important stage in attachment development, during which parental parenting plays a significant role in shaping adolescent outcomes. This study explored the bidirectional relationship between parental overparenting and adolescents’ attachment style. To this end, we used a two-wave cross-lagged model over a 6-month interval with a sample of primary and middle school students (N = 1897) from Sichuan Province, China. Results showed that maternal and paternal overparenting positively predicted both attachment anxiety and avoidance. Adolescents’ attachment anxiety and avoidance also predicted parental overparenting. In addition, paternal overparenting did not predict maternal attachment style, and maternal overparenting did not predict paternal attachment style. These findings indicated that overparenting may link to the reinforcement of adolescents’ attachment styles, which may in turn encourage further overparenting. The results of this study not only deepened our understanding of attachment theory but also provideed guidance for optimising family educational practices.

Ogihara, Y. (荻原祐二) (2025).
Uncommon names are increasing globally: A review of empirical evidence on naming trends.
一般的でない名前が世界的に増加している：名づけの傾向に関する実証研究の概観
Humanities and Social Sciences Communications, 12, 1826.
https://doi.org/10.1057/s41599-025-06156-1

Previous research has shown that uncommon first names are increasing in some nations. However, these findings have been reported separately by nation, making it unclear whether the phenomenon is observed more globally or more locally in some limited nations. Therefore, this article briefly reviews empirical studies that examined temporal changes in the frequency of (un)common names. In addition, I summarize the information of research on (un)common names and naming behaviors for uniqueness. Accumulated evidence has demonstrated that uncommon names increased over time in many nations: Germany, the U.S., the U.K., France, Japan, China, and Indonesia. All the nations that were examined have shown an increase in uncommon names. Thus, the phenomenon is observed more generally, not locally in some limited nations. Moreover, this trend has been found in diverse cultural zones: European, American, East Asian, and Southeast Asian cultures. Therefore, giving uncommon names is a more global trend.

先行研究は、いくつかの国で一般的でない名前が増加していることを示してきた。しかし、それらの知見は、国ごとに個別に報告されていることが多く、一般的でない名前の増加という現象が世界的に共通して見られるのか、一部の限られた国でのみ見られるのか明らかでなかった。そこで本論文は、一般的でない名前の頻度の経時的変化を実証的に検討している研究を概観した。さらに、個性を追求するための一般的でない名前やその名づけに関する情報もまとめた。一般的でない名前は、検討されたすべての国、ドイツ・アメリカ・イギリス・フランス・日本・中国・インドネシアで経時的に増加していることが一貫して示された。したがって、この現象は世界的に共通して見られるものであり、一部の限られた国でのみ見られるものではない。さらにこの傾向は、ヨーロッパ、アメリカ、アジアという多様な文化圏で共通して見られた。よって、一般的でない名前の増加は、より世界的な傾向であると言える。

プレスリリース：https://www.aoyama.ac.jp/faculty115/2025/news_20251202_01

概要の紹介ポスト（X）：https://x.com/Yu_Ogihara/status/1993590106805223677

Ito, T. (伊藤健彦), & Takagishi, H. (高岸治人) (2025).
Associations between individual- and group-level relational mobility and Big Five personality in Japan: A multilevel study of prefectural capitals.
日本における個人レベル・集団レベルの関係流動性とビッグファイブ性格特性の関連：都道府県庁所在地を対象としたマルチレベル分析
Journal of Personality, 1–9.
https://doi.org/10.1111/jopy.70033

This study examined the associations between individual- and group-level relational mobility and the Big Five personality traits, along with demographic variables and macro-level variables, targeting 5048 people in all 47 Japanese prefectural capitals. The study controlled for macro-level variables such as total population, population change rate, population density per 1 km2 of habitable area, number of incoming residents, and number of outgoing residents in each prefectural capital, which previous studies have not examined. Multilevel regression analysis revealed that extraversion was positively associated with both individual- and group-level relational mobility. The present study showed that specific features of the social environment (relational mobility) are positively associated with specific aspects of Big Five personality traits.

日本の47都道府県庁所在地に住む20〜30代の5,048名のデータを用いて、「人間関係を自由に選べる社会かどうか（関係流動性）」と「性格（ビッグファイブ）」の関係を分析しました。

Shimizu, Y.(志水勇之進), Ogawa, K.(小川一美), Kimura, M.(木村昌紀), Fujiwara, K.(藤原 健), & Watanabe, N. (2025).
Introducing the Facial Expressions of Emotion Decoding Test with Various Intensity (FEET-I): Using the AIST Facial Expression Database 2017.
多様な強度を用いた表情解読テスト (FEET-I) の開発─AIST顔表情データベース2017を用いて─
Japanese Psychological Research.
https://doi.org/10.1111/jpr.70009

This article introduces the Facial Expressions of Emotion decoding Test with various Intensity (FEET-I)—using the AIST Facial Expression Database 2017. Study 1 aimed to develop the FEET-I, and the facial stimuli were created by manipulating emotion intensities of Japanese stimuli from the AIST Facial Expression Database 2017 (Fujimura & Umemura, 2018). In Experiment 1a, 114 facial stimuli were selected based on the percentage of correct responses. In Experiment 1b, we applied Item Response Theory (IRT) to examine each item’s difficulty and discrimination and selected 78 items with high internal consistency (ω = .85). Study 2 aimed to examine the convergent validity of the FEET-I. As a result, the score of the FEET-I showed a significant positive correlation with that of the Short version of the Geneva Emotion Recognition Test (GERT-S; Schlegel & Scherer, 2015). Additionally, a small but significant female advantage was observed, consistent with previous findings. The final FEET-I includes 78 stimuli and measures decoding accuracy for Japanese facial expressions of emotion. Future directions regarding the applicability of the FEET-I were discussed.

・強度に変化をつけた表情刺激を用いた，日本人用の感情解読テスト (FEET-I) の作成を試みた。
・AIST 顔表情データベース2017 の日本人刺激を用い，モーフィングによって感情表出の強度を操作した。
・項目反応理論 (IRT) を適用した分析を行い，各刺激の困難度と識別力に基づいて78刺激を選定した結果，高い内的一貫性が確認された。
・また，既存の感情解読テスト (GERT-S) との間に有意な正の相関が確認されたことから，FEET-Iの収束的妥当性が示された。
・以上より，FEET-Iは，日本人における，表情による感情解読の正確さを測定するテストとして有用であると判断された。

Suganuma, H. (菅沼 秀蔵), Katahira, K., Ohtsuki, H., & Kameda, T. (2025).
How social learning enhances—or undermines—efficiency and flexibility in collective decision-making under uncertainty.
社会的学習が不確実性下の集団意思決定の効率性と柔軟性をどのように向上，あるいは劣化させるか
Proceedings of the National Academy of Sciences of the United States of America, 122(48). https://doi.org/10.1073/pnas.2516827122

Balancing efficiency and flexibility in collective decision-making is increasingly critical in modern societies characterized by rapid sociocultural and technological change. Recent research in cognitive neuroscience has proposed two contrasting computational algorithms for social learning: value shaping (VS) and decision biasing (DB). VS posits that others’ choices serve as “pseudo-rewards” that directly shape an observer’s valuations, leading them to prefer popular options even in the absence of outcome feedback. In contrast, DB confines the influence of social information to behavior—observers may imitate popular actions, but they update their valuations solely through personal experience. Although both algorithms facilitate individual adaptation under uncertainty, their interactive dynamics and group-level consequences remain largely unexplored. To address this gap, we developed computational models of VS and DB within a reinforcement learning framework and conducted agent-based simulations to examine collective performance in uncertain and dynamically changing environments. The results reveal a trade-off: VS enables rapid convergence and high efficiency in stable contexts, whereas DB promotes greater adaptability under environmental volatility. These differences are amplified in larger groups, particularly under strong majority influence. Importantly, evolutionary analyses indicate that both learning types can coexist stably, allowing their complementary strengths to enhance group performance. Together, our findings provide a computational and evolutionary account of how social learning can both enhance and impair collective intelligence—and suggest design principles for fostering resilient collective decision systems in human and AI societies facing rapid change.

https://www.atpress.ne.jp/news/558608