Faculty Profiles - IGARASHI Tasuku

Papers - IGARASHI Tasuku

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Loneliness and socioemotional memory Reviewed International journal

Tasuku Igarashi

British Journal of Social Psychology Vol. 64 ( 1 ) 2025.1

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

Do chronically high-lonely individuals exhibit specific memory biases when recalling past social episodes? We explored negative memory biases, focusing on the recall of unfavourable social experiences and social memory biases, emphasizing the recall of social experiences irrespective of emotional valence. We conducted a dictionary-based semantic analysis of autobiographical episodes obtained from 4095 participants via four datasets. Participants recalled a positive, negative or emotionally neutral episode from their recent past. High-lonely individuals predominantly exhibited a decline in recalling positive social episodes, providing partial support for negative memory biases. However, both high- and low-lonely individuals were similarly inclined to recall negative social episodes. These results suggest that the primary issue among high-lonely individuals is the limited recall of positive social experiences rather than the general negativity in memory biases or the hypersensitivity to general social memories.

DOI： 10.1111/bjso.12783

Web of Science

PubMed

S22C-5　日本における不審者の外見的特徴と言動

佐名龍太, 五十嵐祐

日本行動計量学会大会抄録集 Vol. 52 ( 0 ) page： 72 - 73 2024.9

Ninety years after Lewin: The role of familism and attachment style in social networks characteristics across 21 nations/areas

Xian Zhao, Omri Gillath, Itziar Alonso-Arbiol, Amina Abubakar, Byron G. Adams, Frédérique Autin, Audrey Brassard, Rodrigo J. Carcedo, Or Catz, Cecilia Cheng, Tamlin S. Conner, Tasuku Igarashi, Konstantinos Kafetsios, Shanmukh Kamble, Gery Karantzas, Rafael Emilio Mendía-Monterroso, João M. Moreira, Tobias Nolte, Willibald Ruch, Sandra Sebre, Angela Suryani, Semira Tagliabue, Qi Xu, Fang Zhang

Journal of Social and Personal Relationships Vol. 41 ( 8 ) page： 2251 - 2275 2024.8

Language：English Publishing type：Research paper (scientific journal)

Drawing on the literature on person-culture fit, we investigated how culture (assessed as national-level familism), personality (tapped by attachment styles) and their interactions predicted social network characteristics in 21 nations/areas (N = 2977). Multilevel mixed modeling showed that familism predicted smaller network size but greater density, tie strength, and multiplexity. Attachment avoidance predicted smaller network size, and lower density, tie strength, and multiplexity. Attachment anxiety was related to lower density and tie strength. Familism enhanced avoidance’s association with network size and reduced its association with density, tie strength, and multiplexity. Familism also enhanced anxiety’s association with network size, tie strength, and multiplexity. These findings contribute to theory building on attachment and culture, highlight the significance of culture by personality interaction for the understanding of social networks, and call attention to the importance of sampling multiple countries.

DOI： 10.1177/02654075241237939

Web of Science

Scopus

精神疾患に対するパブリックスティグマの軽減方略

原田慎也, 五十嵐祐

日本健康心理学会大会発表論文集 Vol. 36 ( 0 ) page： 54 2023.12

Unequal but not separate: Emergence of rich–poor cooperation in resource exchange Reviewed

Jiayu Chen, Tasuku Igarashi

Asian Journal of Social Psychology Vol. 26 ( 4 ) page： 431 - 444 2023.12

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Addressing inequality is a critical challenge for society as a whole and requires sustained efforts to promote fairness and opportunity for all. Filling in the resource gap across social classes is essential in reducing inequality. Previous studies have revealed that ingroup favouritism hinders the rich from cooperating with the poor and expands the wealth gap. Nevertheless, how to find ways of narrowing the gap between the rich and the poor remains an open question. Inducing rich–poor cooperation could be effective in eliciting resource flow across classes. In this study, two experiments using a modified Prisoner's Dilemma game were conducted in Japan (N = 213) and China (N = 150) to examine whether highlighting partners' cooperativeness under permeable group boundaries induces rich–poor cooperation. All participants were allocated to the rich group and participated in the game with programmed rich- or poor-group partner bots, whose cooperation rates were manipulated. Despite the initial resource disparities between participants and the partner bots, participants were more likely to select and cooperate with cooperative poor-group partners than with non-cooperative rich-group partners. Generalized trust played an important role in the enhancement of rich–poor cooperation. The findings shed light on the possibility of reducing inequality and promoting social mobility in society.

DOI： 10.1111/ajsp.12569

Web of Science

Scopus

The Self-perception of Text message Dependence Scale (STDS): A Brazilian-Portuguese validation and expansion of its psychometric properties

Daniel Tornaim Spritzer, Andr{\'{e } } Luiz Monezi Andrade, Aurora Zamora Xavier, Gabriel Teixeira da Silva, Hyoun S. Kim, Katarzyna Kaliszewska-Czeremska, St{\'{e } }phany Laconi, Tasuku Igarashi, Ives Cavalcante Passos, Simone Hauck

Current Psychology Vol. 42 ( 21 ) page： 17670 - 17681 2023.7

Implementing Petty Favor in Facilitating Rich-Poor Resource Exchange Reviewed

Jiayu Chen, Tasuku Igarashi

Letters on Evolutionary Behavioral Science Vol. 14 ( 1 ) page： 1 - 7 2023.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Human Behavior and Evolution Society of Japan

Humans seek to select and exchange resources with wealthy partners for greater benefits. In this study, we examined whether implementing the “petty favor” option (giving a small amount of resources to interaction partners prior to resource provision to pooled accounts) from rich to cooperative poor group members facilitates rich-poor selection and cooperation. In total, 216 participants were allocated to the rich group and played a repeated two-person public goods game with selfish rich or cooperative poor partner bots. Participants preferred to use the “petty favor” options on cooperative poor partners and contribute a large amount of resources toward public good. The findings suggest that the provision of petty favors motivates providers to exchange more resources with cooperators beyond the existing rich-poor boundary.

DOI： 10.5178/lebs.2023.100

コミュニティー・シェッドを活用した高齢者の社会的孤立・孤独の一次予防　シチズンサポートプロジェクトにおける心理学・脳科学のあり方

伊藤文人, 五十嵐祐, 松尾崇史, 髙島理沙, 鈴木真介, 橋本剛

日本心理学会大会発表論文集 Vol. 87 ( 0 ) page： SS-041 - SS-041 2023

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人日本心理学会

<p>社会的孤立・孤独は，さまざまな疾患のリスク因子となっており，孤立・孤独を生まない体制や社会の構築は喫緊の課題と言えます。しかし，高齢者が集う地域の場で男性が少ないことが，長年全国共通の課題となっています。こうした背景に基づき，2022年からJST-RISTEX SOLVE for SDGs 社会的孤立枠（総括：浦光博教授）の助成を受け，「シチズンサポートプロジェクトによる社会的孤立・孤独の一次予防」がスタートしました。このプロジェクトは，高齢者向けの新たな居場所「コミュニティー・シェッド（メンズ・シェッド）」の運営を行いながら，その効果を検証していきます。このコミュニティー・シェッドは，地域住民が自ら立ち上げ・運営を行い，仲間たちとともに木工など自分たちの興味のある活動を自由に行うことができる居場所で，海外ではメンズ・シェッドと呼ばれます。世界ではすでにその効果が広く認められている一方，具体的にどのような効果があるかについての科学的なエビデンスは限られています。心理学や脳科学は孤立・孤独の予防にどのように活かすことができるのか，これまでのプロジェクトの活動を踏まえて，議論できればと思います。</p>

DOI： 10.4992/pacjpa.87.0_ss-041

CiNii Research

Altruism in individual’s information sharing about COVID-19 Vaccines

Chen Jiayu, Igarashi Tasuku

The Proceedings of the Annual Convention of the Japanese Psychological Association Vol. 87 ( 0 ) page： 3C-002-PC - 3C-002-PC 2023

Loneliness and social daydreaming (2) Crowdsourcing samples

Igarashi Tasuku, Mitsunaga Haruhiko, Hirashima Taro, Yoshida Takuya

The Proceedings of the Annual Convention of the Japanese Psychological Association Vol. 87 ( 0 ) page： 2A-020-PC - 2A-020-PC 2023

Aspects of Criminal Stereotypes in Japan. Examination of Stereotype Differences by Type of Crime.

Same Ryuta, Igarashi Tasuku

The Proceedings of the Annual Convention of the Japanese Psychological Association Vol. 87 ( 0 ) page： 1B-054-PE - 1B-054-PE 2023

Is Mentalizing Essential to Predict Human Network Size? Reexamining the Social Brain Hypothesis From a Social Network Perspective

Taro Hirashima, Tasuku Igarashi

Letters on Evolutionary Behavioral Science Vol. 13 ( 2 ) page： 50 - 56 2022.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Human Behavior and Evolution Society of Japan

One central question in social science and evolutionary anthropology is how humans can form and maintain large social networks. The social brain hypothesis argues that humans use their mentalizing ability to read others’ minds for the development of dyadic relationships in layered social networks. However, previous empirical studies have not directly examined the association between mentalizing and the size of the active network located at the outermost layer. By introducing a social network perspective, we predicted that individuals use their mentalizing ability not only to form and maintain dyadic relationships but also to belong to multiple communities, which indirectly expands the active network size. We collected data from undergraduates in Japan (N = 175) to examine how mentalizing is linked to the size of online social networks. Mentalizing was positively associated with the number of dyads but not with the number of communities and the active network size. These findings suggest that the social brain hypothesis has limited validity, and there is a need for more careful explanations surrounding the psychological and structural underpinnings of large human social networks.

DOI： 10.5178/lebs.2022.99

Does Mental Simulation Decrease the Empathy Gap in Help-Seeking?

Kengo Furuhashi, Tasuku Igarashi

Japanese Psychological Research 2022.7

Language：English Publishing type：Research paper (scientific journal)

People hesitate to seek help when they perceive the cost of helping as high. In general, help-seekers overestimate the cost of helping because of errors in perspective-taking. We examined whether three processes of mental simulation (recalling an experience of providing help, of rejecting a request for help, and of sensing the empathy gap) would decrease the cost of helping perceived by help-seekers. Participants underwent one of the simulations or no simulation (control condition), read two scenarios that described helping and help-seeking, and rated the perceived cost of helping in the scenarios. Contrary to the prediction, simulations did not decrease the cost of helping perceived by help-seekers. Recalling an experience of rejecting requests also increased the perceived cost of helping in unemployment scenarios. The post hoc analysis for controlling the depressive mood in depression scenarios showed that the cost of helping from the helper's perspective decreased, whereas that from the help-seekers remained the same under the empathy-gap simulation condition. These results suggest that realizing the asymmetry between helpers and help-seekers may be counterproductive in help-seeking and widen the empathy gap.

DOI： 10.1111/jpr.12436

Web of Science

Scopus

Development of the Japanese Version of the Linguistic Inquiry and Word Count Dictionary 2015

Tasuku Igarashi, Shimpei Okuda, Kazutoshi Sasahara

Frontiers in Psychology Vol. 13 2022.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Frontiers Media {SA}

<jats:p>The Linguistic Inquiry and Word Count Dictionary 2015 (LIWC2015) is a standard text analysis dictionary that quantifies the linguistic and psychometric properties of English words. A Japanese version of the LIWC2015 dictionary (J-LIWC2015) has been expected in the fields of natural language processing and cross-cultural research. This study aims to create the J-LIWC2015 through systematic investigations of the original dictionary and Japanese corpora. The entire LIWC2015 dictionary was initially subjected to human and machine translation into Japanese. After verifying the frequency of use of the words in large corpora, frequent words and phrases that are unique to Japanese were added to the dictionary, followed by recategorization by psychologists. The updated dictionary indicated good internal consistency, semantic equivalence with the original LIWC2015 dictionary, and good construct validity in each category. The evidence suggests that the J-LIWC2015 dictionary is a powerful research tool in computational social science to scrutinize the psychological processes behind Japanese texts and promote standardized cross-cultural investigations in combination with LIWC dictionaries in different languages.</jats:p>

DOI： 10.3389/fpsyg.2022.841534

Web of Science

PubMed

援助要請における援助者選択に関する研究と展望

古橋健悟, 五十嵐祐

名古屋大学大学院教育発達科学研究科紀要. 心理発達科学 Vol. 68 page： 17 - 25 2022.3

社会心理学から「孤独」にアプローチする Invited

五十嵐祐

臨床心理学 Vol. 22 page： 218 - 222 2022.3

Processes of Social Influence on Sampling Behavior: The Effect of Other's Positive Attitude and Receiver's Prior Experience

Tsuchiya Koji, Kashima Yoshihisa, Yoshida Toshikazu, Harada Chika, Igarashi Tasuku

JAPANESE PSYCHOLOGICAL RESEARCH Vol. 64 ( 1 ) page： 64 - 72 2022.1

Help-seeking in getting a new job

Furuhashi Kengo, Igarashi Tasuku

The Proceedings of the Annual Convention of the Japanese Psychological Association Vol. 86 ( 0 ) page： 3AM-086-PQ - 3AM-086-PQ 2022

Effects of the first person perspective on moral judgement on SNS posting

Kato Jin, Igarashi Tasuku

The Proceedings of the Annual Convention of the Japanese Psychological Association Vol. 86 ( 0 ) page： 1EV-012-PC - 1EV-012-PC 2022

Social comparison and perceived social mobility in cross-status impression formation

Chen Jiayu, Igarashi Tasuku

The Proceedings of the Annual Convention of the Japanese Psychological Association Vol. 86 ( 0 ) page： 1EV-025-PC - 1EV-025-PC 2022

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Papers - IGARASHI Tasuku