お知らせ

2025年度第3回社会心理学国際セミナーを開催します

下記の日程で国際セミナーを開催します。スピーカーはケミン・ヤン先生（ダラム大学社会学准教授、日本学術振興会BRIDGEフェロー）です。講演は英語で行われます。多くの皆様のご参加をお待ちしています。

日時：2025年9月3日（水）10:00-11:00

場所：名古屋大学教育学部2F・G演習室

主催：社会心理学研究室

参加自由・予約不要

問い合わせ先：igarashi.tasuku.n6@f.mail.nagoya-u.ac.jp（五十嵐）

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Identifying the Loneliest Intersectional Groups among Young People in England: Results from Active Lives Surveys (2022-23)

After exploring the effect of individual risk factors on chronic loneliness, it is important to identify the intersectional groups who are the most vulnerable to chronic loneliness. The number of studies that consciously follow the intersectional approach and systematically examine the intersections of multiple attributes remains very small. Analysing the data collected from the adult sample of Active Lives Surveys (2022-23, n=172,968), this paper identifies the loneliest intersectional groups among young people (aged 16-24) in England (n=10,549) by following ‘the conditional progressive approach’. It analyses the prevalence of ‘chronic loneliness’ across intersections of age, gender (including non-binary and transgender), sexual orientation, ethnicity, and disability. The findings reveal an overall positive relationship between the number of intersectional attributes and the prevalence of ‘chronic loneliness’: the prevalence of ‘chronic loneliness’ is much higher among young people with disability or LGBT+ groups than the prevalence among young people as a whole, and the prevalence rises even further at the intersection of disability and gender or sexuality, but not as much at the intersection of ethnicity and gender and sexuality. Further research needs to explore the underlying causes, and policymakers and practitioners should take these intersectional groups as the target of support and intervention.

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イングランドの若者における最も孤独な交差的グループの特定：Active Lives調査（2022–23年）の結果

個人のリスク要因が慢性的な孤独に与える影響を検討した後、慢性的な孤独に最も脆弱な交差的グループを特定することが重要です。複数の属性の交差点を体系的に検討する交差性アプローチに従った研究は、依然として非常に少数です。本研究では、Active Lives調査（2022–23年、成人サンプル n=172,968）のデータを分析し、イングランドの若者（16〜24歳、n=10,549）における最も孤独な交差的グループを「条件付き漸進的アプローチ」に基づいて特定します。年齢、ジェンダー（ノンバイナリーおよびトランスジェンダーを含む）、性的指向、民族性、障害の交差点における「慢性的な孤独」の有病率を分析します。調査結果は、交差的属性の数と「慢性的な孤独」の有病率との間に全体的な正の関係があることを示しています。障害を持つ若者やLGBT+グループでは、「慢性的な孤独」の有病率が若者全体よりもはるかに高く、障害とジェンダーまたは性的指向の交差点ではさらに有病率が上昇します。一方、民族性とジェンダーおよび性的指向の交差点では、それほど有病率は上昇しません。今後の研究では、その根本的な原因を探る必要があり、政策立案者や実務者は、これらの交差的グループを支援と介入の対象として捉えるべきです。

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北海道の味覚を頂きました

先日、五十嵐先生のご実家から届いた「北海道のメロン」をゼミメンバーで頂きました！

このメロンをいただく会は、実は２年前に復活しており、夏の恒例行事となりつつあります。

おいしいメロンをいただき、暑さに負けず研究に取り組むための英気を養いました！

五十嵐先生、ご家族の皆様

美味しいメロンをありがとうございました！

メロンを手にされた五十嵐先生の笑顔も変わらず（左：2年前、中央：昨年、下：今年）、メンバー一同大満足でした！

2025年度第2回社会心理学国際セミナーを開催します

下記の日程で国際セミナーを開催します。スピーカーはNils Sandman先生（トゥルク大学主任研究員）、Yuko Mori先生（トゥルク大学医学部博士研究員）です。講演は英語で行われます。多くの皆様のご参加をお待ちしています。

日時：2025年7月17日（木）13:00-14:30

場所：名古屋大学教育学部2F・G演習室

主催：社会心理学研究室

参加自由・予約不要

問い合わせ先：igarashi.tasuku.n6@f.mail.nagoya-u.ac.jp（五十嵐）

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タイトル：Loneliness among Youth: Reports from Finland

• Loneliness as a psychological and biological phenomenon and experiences of loneliness among university students in Finland (Dr. Nils Sandman)
  

Loneliness is a negative subjective experience where a person feels that they do not have enough social interactions or the social interactions they have are not emotionally satisfying. If loneliness persists for a long time, it is associated with negative consequences for both mental and physical health. In this talk I will give an overview of loneliness as a psychological and biological phenomenon and discuss recent trends of increased experiences of loneliness among young people in Finland and around the around the world. I will also present preliminary results from a recent survey investigating loneliness, wellbeing and associated factors of students at Finnish universities (N=399) and discuss ideas for future research. Dr. Nils Sandman is a senior researcher at University of Turku, Finland, as well as expert member of psychology at Finnish National Agency for Education, a part of Finnish Ministry of Education and Culture. His research interest includes, wellbeing of young people, sleep research and environmental as well as evolutionary psychology.

• Mental Health Across Borders: Cross-National Insights into Youth Mental Health and Time-Trend of Loneliness (Dr. Yuko Mori)
  

Cross-national research is important for a comprehensive understanding of mental health and we-being on a global scale. Cross-national studies with a sound methodological design can inform evidence-based strategies for promoting and improving the mental well-being of people worldwide. In this talk, I will present recent and ongoing research on child and adolescent mental health across national contexts. First, I will present findings from a large-scale cross-national study involving 21,688 adolescents from 13 Asian and European countries, examining key issues such as bullying, school safety, suicidality, and help-seeking behavior. Second, I will share insights from our previous and planned time trend studies on loneliness among Finnish children, covering data from the past 30 years. Finally, I will present results from a recent systematic review mapping existing cross-national research on loneliness in children and adolescents. Dr. Yuko Mori is a postdoctoral researcher at the Faculty of Medicine, University of Turku, Finland. She holds a PhD in Child Psychiatry from the University of Turku and an MSc in Education from the University of Gothenburg, Sweden. She specializes in cross-national survey research, with a focus on adolescent mental health.

AASP 2025で発表を行います

2025年7月10日（月）～ 12日（日）に開催されるAsian Association of Social Psychology (AASP 2025) Conference（マレーシア・モナシュ大学）で、以下の発表を行います。

口頭発表

【160: Prejudice & Discrimination】

• Tasuku Igarashi (2025). Does Public Stigma of Loneliness Really Exist in Japan? (7月10日 13:00 ~ 13:15)

ポスター発表

【343: Technology/Media/Digital Behavior】

• Rei Yamada & Tasuku Igarashi (2025). Participants' Meta-Dehumanization in Crowdsourcing Platforms（7月11日 12:15 ~ 13:15）

【344: Positive Psychology/Prosocial behavior】

• Mizuho Harada & Tasuku Igarashi (2025). Multiple Evaluator Estimations Reveal Persistent Negative Evaluations of Altruistic Behavior（7月11日 12:15 ~ 13:15）

INSNA Sunbelt 2025で発表を行います

2025年6月23日（月）～ 29日（日）に開催されるINSNA Sunbelt 2025（パリ・ソルボンヌ大学）で，以下の発表を行います。

【OS-150: Modeling Network Dynamics 2】

• Tasuku Igarashi, Johan Koskinen, Colin Gallagher, Conrad Chan, David Liptai (2025). More nominations, less reciprocation: Modeling an “overchoosing” phenomenon in large social networks (6月28日 11:00~11:20) Link

Social network researchers often assume that mutual nominations between actors are more likely to occur than one-sided nominations. However, this assumption does not always hold, particularly in large social networks. Actors who nominate many others often do not achieve complete reciprocation from all their nominees. In this presentation, we introduce a new parameter termed “overchoosing,” which integrates reciprocity and outdegree popularity effects as their product. This parameter captures an endogenous tie-formation process not adequately represented by existing network configurations. We hypothesize a negative estimate for the overchoosing parameter, indicating that the greater the number of outgoing nominations by an actor, the lower the likelihood that each nomination will be reciprocated. To test this hypothesis, we implemented the overchoosing parameter within stochastic actor-oriented models (SAOM). Analyses of secondary school friendship networks (N > 1000, two waves) demonstrated that the model including the overchoosing parameter provided a better fit to observed data compared to a model without it, as evaluated by the triad census goodness-of-fit indices—particularly for the triadic out-star without reciprocation (021D). We also present and discuss findings from additional analyses of online social networks and bitcoin trust networks (Ns > 500, number of waves > 100) by Bayesian SAOM optimized for parallel computation on supercomputers (Chan et al., 2022). These insights help refine our understanding of how reciprocal relationships form or dissolve in larger social networks.