国際誌論文データベース

Kanemasa, Y. (金政祐司), Miyagawa, Y. (宮川裕基), & Arai, T. (荒井崇史) (2024). 
Attachment anxiety and the dark triad increase stalking after breakups of romantic relationships through psychological maltreatment of romantic partners and reactions to breakups.
愛着不安ならびにダークトライアドが関係破綻後のストーキング加害を増大させるプロセス：パートナーへの心理的な暴力や関係破綻への反応による媒介効果
Aggressive Behavior, 50, e22133.
https://doi.org/10.1002/ab.22133

This study examined whether two personality traits, attachment anxiety, and the Dark Triad, longitudinally promote stalking behaviors after romantic breakups through psychological maltreatment of partners during relationships and maladjusted reactions to breakups. We conducted a prospective longitudinal study across four waves of assessment for 1 year of individuals in romantic relationships in Japan. They completed measures of attachment anxiety, the Dark Triad, need for control, and psychological intimate partner violence (IPV) perpetration at Wave 1, and measures of maladjusted reactions to breakups (i.e., anger and rumination) and stalking behaviors at a wave after breakups. The final sample consisted of 356 participants who were involved in romantic relationships at Wave 1 and left by their partners during the survey period. Correlational analysis showed that the Dark Triad at Wave 1 was significantly positively associated with future stalking behaviors, but attachment anxiety was not. Structural equation modeling showed that attachment anxiety and the Dark Triad increased future stalking behaviors after breakups through psychological IPV perpetration during relationships. Additionally, attachment anxiety increased future stalking behaviors through higher levels of postbreakup anger and rumination. Conversely, we did not find any indirect effects of the Dark Triad on stalking behaviors through these reactions toward breakups. Overall, these results suggest that it is necessary to consider personality traits that could damage intimate relationships and to focus on the quality of romantic relationships to prevent stalking after romantic breakups. These results also indicate that emotion regulation may be useful in preventing stalking caused by attachment anxiety.

Mizuno, K. (水野景子), & Shimizu, H. (清水裕士) (2023). 
Measuring social value orientation by model-based scoring.
モデルベーストスコアリングによる社会的価値志向性 (SVO) の測定
Behaviormetrika.
https://doi.org/10.1007/s41237-023-00211-4 

This study proposes a method of measuring social value orientation using model-based scoring and a task suitable for such scoring. We evaluated this method by means of parameter recovery simulation (Study 1), and we examined its retest reliability (Study 2) and its predictive validity (Study 3). The results indicate that the proposed method has low bias and sufficient predictive validity. While the improvement in predictive validity of altruism was negligible and comparable to previous scoring methods in terms of confidence intervals, the measurement of equality using the proposed model and task combination produced a moderate correlation that was not observed with other methods. Although SVO is a concept used primarily in psychology, the model assumed in this study is mathematically equivalent to a well-known economics model. We, therefore, suggest that this method may lead to cross-disciplinary research.

Ishihara, T., Hashimoto, S., Tamba, N., Hyodo, K., Matsuda, T., & Takagishi, H.（高岸治人） (2024). 
The links between physical activity and prosocial behavior: an fNIRS hyperscanning study. 
身体活動と向社会的行動の関連：fNIRSハイパースキャンニング研究
Cerebral Cortex, bhad509.
https://doi.org/10.1093/cercor/bhad509

The prevalence of physically inactive lifestyles in modern society raises concerns about the potential association with poor brain health, particularly in the lateral prefrontal cortex, which is crucial for human prosocial behavior. Here, we explored the relationship between physical activity and prosocial behavior, focusing on potential neural markers, including intra-brain functional connectivity and inter-brain synchrony in the lateral prefrontal cortex. Forty participants, each paired with a stranger, completed two experimental conditions in a randomized order: (i) face-to-face and (ii) face stimulus (eye-to-eye contact with a face stimulus of a fictitious person displayed on the screen). Following each condition, participants played economic games with either their partner or an assumed person displayed on the screen. Neural activity in the lateral prefrontal cortex was recorded by functional near-infrared spectroscopy hyperscanning. Sparse multiset canonical correlation analysis showed that a physically inactive lifestyle was covaried with poorer reciprocity, greater trust, shorter decision-making time, and weaker intra-brain connectivity in the dorsal lateral prefrontal cortex and poorer inter-brain synchrony in the ventral lateral prefrontal cortex. These associations were observed exclusively in the face-to-face condition. Our findings suggest that a physically inactive lifestyle may alter human prosocial behavior by impairing adaptable prosocial decision-making in response to social factors through altered intra-brain functional connectivity and inter-brain synchrony.

Hiraoka, D. (平岡大樹), Kawanami, A., Sakurai, K., & Mori, C. (2024).
Within-individual relationships between mother-to-infant bonding and postpartum depressive symptoms: a longitudinal study.
母子ボンディング感情と産後うつ症状との個人内関連性
Psychological Medicine, Advance online publication, 1–9.
https://doi.org/10.1017/S0033291723003707

Background
Although the importance of the dynamic intra-individual relationship between mother-to-infant bonding and postpartum depressive symptoms has been widely recognized, the complex interplay between them is not well understood. Furthermore, the potential role of prenatal depressive symptoms and infant temperament in this relationship remains unclear. This study aims to examine the bidirectional influence of mother-to-infant bonding on postpartum depressive symptoms within individuals and to elucidate whether prenatal depressive symptoms and infant temperament would influence deviations from stable individual states.

Methods
Longitudinal data were collected from 433 women in early pregnancy. Of these, 360 participants completed the main questionnaires measuring impaired mother-to-infant bonding and postpartum depressive symptoms at least once during the postpartum period. Data were collected at early and late pregnancy and several postpartum time points: shortly after birth and at one, four, ten, and 18 months postpartum. We also assessed prenatal depressive symptoms and infant temperament. A random-intercept cross-lagged panel model was used.

Results
Within-individual variability in mother-to-infant bonding, especially anger and rejection, significantly predicted subsequent postpartum depressive symptoms. However, the inverse relationship was not significant. Additionally, prenatal depressive symptoms and difficult infant temperament were associated with greater within-individual variability in impaired mother-to-infant bonding and postpartum depressive symptoms.

Conclusions
The present study demonstrated that the within-individual relationship between mother-to-infant bonding and postpartum depressive symptoms is likely non-bidirectional. The significance of the findings is underscored by the potential for interventions aimed at improving mother-to-infant bonding to alleviate postpartum depressive symptoms, suggesting avenues for future research and practice.

Umetani, R (梅谷凌平)., Yamamoto, H (山本仁志)., Goto, A (後藤晶)., Okada, I (岡田勇)., & Akiyama, E. (2023). 
Individuals reciprocate negative actions revealing negative upstream reciprocity. 
ネガティブな行動をとると負のアップストリーム互恵性が生じる
Plos one, 18(7), e0288019.
https://doi.org/10.1371/journal.pone.0288019

Indirect reciprocity is widely recognized as a mechanism for explaining cooperation and can be divided into two sub-concepts: downstream and upstream reciprocity. Downstream reciprocity is supported by reputation; if someone sees you helping someone else, the person who sees this will think higher of you, and you will be more likely to be helped. Upstream reciprocity is helping someone because you are being helped by somebody else, which often happens in everyday life and experimental games. This paper focuses on the behavior of “take” and examines negative upstream reciprocity using an upstream reciprocity framework. The term “take” is defined as “to steal rather than give resources to others.” “If something is taken from you, do you take from others?” is an important extension for indirect reciprocity research; subsequently, this paper discusses experiments conducted on whether negative upstream reciprocity is chained and what causes it. The results demonstrated differences between positive and negative upstream reciprocity. In analyzing the data of nearly 600 participants to determine the extent to which negative upstream reciprocity is observed and the causes of negative upstream reciprocity, the study found that If individual A takes resources from individual B, then B is more likely to take resources from a third-party, individual C. Notably, some causes of positive upstream reciprocity were found to have no effect or the opposite effect on negative upstream reciprocity. The results also demonstrate that the first person to take can cause a chain reaction. This paper demonstrates the importance of the first person not taking from someone else and suggests the need to consider various behavioral options for future research on cooperation.

https://www.tsukuba.ac.jp/journal/society-culture/20230731140000.html https://www.iza.ne.jp/article/20230807-3VVOR37E7JBAXKJW3U735KVPPQ/

Yang, F.（楊帆）, Hagiwara, C.（萩原千晶）, Kotani, T., Hirao, J., & Oshio, A（小塩真司）.(2023).
Comparing self-esteem and self-compassion: An analysis within the Big Five personality traits framework.
自尊感情とセルフコンパッションの比較：ビッグファイブを枠組みとして
Frontiers in Psychology, 14, 1302197.
https://doi.org/10.3389/fpsyg.2023.1302197

Self-esteem and self-compassion are two ways to relate to oneself. However, little is known about the similarities and differences between these two constructs. The current study used cross-sectional data from a Japanese sample to explore their relationship from a Big Five perspective. Results showed that differences between self-esteem and self-compassion appeared mainly in openness, agreeableness, and neuroticism. Specifically, self-esteem was uniquely associated with openness, and self-compassion was uniquely associated with agreeableness. Moreover, the negative correlation between self-compassion and neuroticism was larger than that between self-esteem and neuroticism. Implications and future directions are discussed.

自己に関する概念である自尊感情とセルフ・コンパッションについてはこれまで，その違いが明らかになっていない。本研究では全般的なパーソナリティ特性を測定できるBig Five尺度との関連について偏相関分析を行うことを通して，自尊感情とセルフ・コンパッションの違いを検討した。

Hierarchical structures emerge from the cultural transmission: An iterated learning experiment using a non-linguistic task. 
文化伝達を通した階層構造の創発：非言語課題を用いた繰り返し学習実験
Frontiers in Artificial Intelligence, 6, 1221329. 
https://doi.org/10.3389/frai.2023.1221329

Human language is characterized by complex structural features, such as the hierarchical combination of words to form sentences. Although other animals use communication systems, empirical evidence of hierarchical structures is rare. Computational studies of language evolution have suggested that cultural transmission plays a key role in the emergence of structural features in human languages, including hierarchy. While the previous study demonstrated the emergence of hierarchical structures in non-linguistic systems, we argue that their laboratory study may have overestimated the role of cultural transmission because of a lack of appropriate controls and analyses. To directly test the effect of cultural transmission, we conducted an experiment with no cultural transmission as a control (individual condition) in addition to replicating the previous transmission experiment (transmission condition). Our study has added a quantitative analysis of the hierarchical depth. We found that sequences became more structured as the number of generations increased; however, those produced under the transmission condition were more structured than those under the individual condition. These findings suggest that cultural transmission plays an important role in the emergence of hierarchical structures, which cannot be explained by increased learnability alone. The emergence of complex structural properties in human culture, such as language, technology, and music, may have resulted from information transmission processes between different individuals. In conclusion, this study provides evidence of the crucial role of cultural transmission in the emergence of hierarchical structures in non-linguistic communication systems. Our results contribute to the ongoing debate on the origins of human language and the emergence of complex cultural artifacts. The results of this study have implications for the study of cultural evolution and the role of transmission in shaping the emergence of structural features across diverse domains.

Nakata, S.(中田星矢) & Takezawa, M.(竹澤正哲) (2023). 
Conditions under which faithful cultural transmission through teaching promotes cumulative cultural evolution.
教育による忠実な文化伝達が累積的文化進化を促進する条件
Scientific Reports, 13, 20986.
https://doi.org/10.1038/s41598-023-47018-7

It has been argued that teaching promotes the accurate transmission of cultural traits and eventually leads to cumulative cultural evolution (CCE). However, previous studies have questioned this argument. In this study, we modified the action sequences model into a network exploring model with reinforcement learning to examine the conditions under which teaching promotes CCE. Our model incorporates a time trade-off between innovation and teaching. Simulations revealed that the positive influence of teaching on CCE depends on task difficulty. When the task was too difficult and advanced, such that it could not be accomplished through individual learning within a limited time, spending more time on teaching—even at the expense of time for innovation—contributed to CCE. On the contrary, the easier the task, the more time was spent on innovation than on teaching, which contributed to the improvement of performance. These findings suggest that teaching becomes more valuable as cultures become more complex. Therefore, humanity must have co-evolved a complex cumulative culture and teaching that supports cultural fidelity.

Nozaki, Y. (野崎優樹) & Kobayashi, R. (小林亮太) (2023). 
Instrumental motives in emotion regulation of one’s own and others' anger: Testing cross-cultural similarities and differences between European Americans and Japanese.
自他の怒り情動調整における道具的動機：ヨーロッパ系アメリカ人と日本人を対象とした文化間共通点と相違点の検証
Journal of Cross-Cultural Psychology, Advance online publication. https://doi.org/10.1177/00220221231212176

Instrumental motives, such as increasing negative emotions to facilitate performance, are one of the primary motives in regulating one’s own emotions (i.e., intrinsic emotion regulation) and others’ emotions (i.e., extrinsic emotion regulation). However, most instrumental emotion regulation research has been conducted in Western countries, even though desired emotions, such as anger, could vary across Western and Eastern cultures. This research investigates cross-cultural similarities and differences between European Americans and Japanese in instrumental motives for regulating one’s own (Study 1) and others’ anger (Study 2). To this end, the two preregistered studies used the context of playing an aggressive or nonaggressive computer game, a common methodology used in previous research on instrumental anger regulation. The results showed that both European Americans and Japanese significantly preferred angry stimuli for themselves and their partners before playing an aggressive game over a nonaggressive one. We also found that European Americans preferred anger stimuli significantly more than Japanese, although these cultural differences were neither large nor robust. Furthermore, individual differences in the perceived utility of anger were positively associated with a preference for angry stimuli, whereas cultural self-construals were not significantly associated with a preference for angry stimuli among either European Americans or Japanese. This research provides novel evidence for the cross-cultural similarity of instrumental anger regulation in both intrinsic and extrinsic emotion regulation between European Americans and Japanese.

パフォーマンスを上げるためにネガティブ情動を高めるといった「道具的動機」は，自分自身の情動や他者の情動を調整する際の主要な動機の1つである。しかし，怒りなどの情動の望ましさは欧米と東洋の文化圏で異なる可能性があるにもかかわらず，道具的情動調整に関する研究のほとんどは欧米諸国で行われていた。本研究では，ヨーロッパ系アメリカ人と日本人を対象とし，自分の怒り（研究1）と他者の怒り（研究2）を調整する道具的動機の文化間の共通点と相違点を検討した。この2つの研究は事前登録を行い，道具的怒り調整に関する先行研究でよく用いられる，攻撃的または非攻撃的なコンピューターゲームをプレイするという文脈が用いられた。実験の結果，ヨーロッパ系アメリカ人も日本人も，非攻撃的なゲームよりも攻撃的なゲームをプレイする前に，自分自身やパートナーが怒り音楽を聞いたり，怒り記憶を思い出したりすることを，有意に選好することが示された。また，ヨーロッパ系アメリカ人は日本人よりも，この状況で怒り刺激を有意に強く選好することが明らかになったが，これらの文化差は大きくも頑健でもなかった。さらに，ヨーロッパ系アメリカ人と日本人ともに，怒りの有用性知覚の個人差は怒り刺激の選好と正の相関を示したが，文化的自己観は怒り刺激の選好とは有意な相関を示さなかった。本研究は，道具的動機に基づく怒り調整が，自他の情動調整の両方において，ヨーロッパ系アメリカ人と日本人に関して文化間で共通点が見られることを示す新しい証拠を提供するものである。

Yang, F.(楊帆), Sawada, N.(澤田奈々実), & Oshio, A.(小塩真司) (2023). 
Development and validation of the Japanese version of the Langer Mindfulness Scale.
The Langer Mindfulness Scale日本語版の開発
Japanese Psychological Research.
https://doi.org/10.1111/jpr.12490

Measures for meditative mindfulness have been developed and validated. However, relatively little attention is paid to a socio-cognitive definition of mindfulness, also known as Langerian mindfulness. Socio-cognitive mindfulness is an indispensable perspective for studying mindfulness within a social context. In this paper, we online conducted one pilot and two studies, with a total of 831 Japanese participants, to develop and validate the Japanese version of the Langer Mindfulness Scale (LMS-J). In the pilot study, we confirm the dimensionality via exploratory factor analysis. In Study 1, confirmatory factor analysis and test-retest reliability based on a four-week interval were performed. In Study 2, convergent and discriminant validity was tested by examining the relationships between Langerian mindfulness and meditative mindfulness, Big Five personality traits, and life satisfaction. Overall, results suggest that the factor structure of the LMS-J is like its original version, and the LMS-J is a reliable and valid measure. Therefore, the LMS-J can be used to measure Langerian mindfulness in the Japanese population, especially for research in individual development within a social context.