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THAM Yukari JessicaGraduate School of Humanities / Division of Human Social DynamicsAssistant Professor
Researcher basic information
■ Research Keyword■ Research Areas
■ Committee History
Research activity information
■ Award- Feb. 2024 Japanese Psychological Association, Excellent Presentation Award at the 87th Annual Convention
- Oct. 2023 Japanese Group Dynamics Association, Excellent Presentation Award at the 69th Annual Convention
- Feb. 2023 Sumitomo Life Insurance Company, Sumisei Award for Women in Humanities and Social Sciences
- Oct. 2022 Japanese Psychological Association, Excellent Presentation Award at the 86th Annual Convention
- Jan. 2022 Japan Society for the Promotion of Science, Ikushi Prize 2021
- Sep. 2021 Japanese Group Dynamics Association, Excellent Presentation Award at the 67th Annual Convention
- Oct. 2020 Japanese Psychological Association, Excellent Presentation Award at the 84th Annual Convention
- Dec. 2018 The Japanese Society of Social Psychology, Young Researcher's Scholarship Award 2018
- Lead, Mar. 2024, Journal of Community & Applied Social Psychology, 34(2) (2), e2783, English[Refereed]
- Lead, Springer Science and Business Media LLC, Dec. 2022, Transportation, 49(6) (6), 1715 - 1736[Refereed]Scientific journal
- While community-based sports clubs can provide children with opportunities for physical exercise, they often need a high degree of support from the children’s parents. The present study investigated the motivations for mothers to support these clubs based on previous studies on motivation for volunteering. We conducted an online survey of Japanese mothers (N = 800) whose children in grades three to six participated in community-based junior sports clubs (N = 800). The results indicated that high levels of harassment among parents, as well as volunteer requirements, increased the mothers’ feelings of being burdened, causing them to be less likely to continue supporting the club. We also found that the satisfaction with volunteer participation had positive effects on the mothers’ intentions to continue to support the clubs and reduced feelings of being burdened. Furthermore, justice sensitivity moderated the relationship between the sense of burden and the intention to continue supporting the clubs. The results of the present study are expected to be examined with respect to other volunteer activities.The Japanese Psychological Association, Apr. 2022, Japanese Psychological Research, 93(1) (1), 10 - 20, Japanese[Refereed]Scientific journal
- In everyday life, we often face a "volunteer's dilemma (VoD)"-a group situation in which one member has to incur the cost of providing a public good. In the VoD, members of a group may wait for each other to volunteer, and thus, the group may fail to achieve the public good. Previous research has examined the probability of this failure and found that it was lower than theoretically expected. This discrepancy may have been because only material (e.g., money) and not social rewards (e.g., favourable evaluations) were considered in the theoretical expectations. To investigate whether and how people gain social rewards or are evaluated favourably by others in the VoD in everyday life (specifically in workplace contexts), we conducted a scenario-based experiment (N = 582). The results showed that people were evaluated as more moral and competent when they volunteered than when they did not. Furthermore, this was the case especially when all the other group members shirked and when the evaluator was also willing to volunteer. These findings contribute to our current understanding of the way people perceive volunteers and shirkers in the VoD. They also have an implication on people's motivation to incur a cost for their group in such a situation.Lead, Wiley, Mar. 2022, Asian Journal of Social Psychology, 25(1) (1), 117 - 125, English[Refereed]Scientific journal
- Lead, Feb. 2022, Personality and Individual Differences, 185, 111236Who incurs a cost for their group and when? The effects of dispositional and situational factors regarding equality in the volunteer’s dilemma[Refereed]
- Handicapped people have faced discriminatory attitudes from the non-handicapped. This often deprives them of fundamental human rights and can exacerbate mental illness. Symbolic ableism is one of the key forms of discriminatory attitudes toward the handicapped, and this is regarded as a cause of disagreement with policies to support the handicapped. The propensity of symbolic ableism can be measured by the Symbolic Ableism Scale (SAS; Friedman & Awsumb, 2019), which divides symbolic ableism into four components: individualism, lack of recognition of continuing discrimination, lack of empathy for disabled people, and excessive demands. Although this scale is necessary for understanding people's attitudes toward the handicapped, it is not available in Japanese. This study was conducted to develop a Japanese version of SAS (SAS-J) and examined its reliability and validity. The result showed that SAS-J was divided into two components (i.e., individualism and lack of recognition of current condition), which is different from the original version. We discussed possible explanations of this difference, the reliability and validity of SAS-J, and future directions of symbolic ableism.The Japanese Psychological Association, Feb. 2022, Japanese Psychological Research, 92(6) (6), 532 - 542, Japanese[Refereed]Scientific journal
- Previous studies have attempted to elucidate people’s motives for rejecting unfair offers in the ultimatum game. One approach assumes that people reject unfair offers to punish ill intentions behind the offers, motivated by retribution and/or deterrence. To disentangle these two motives and investigate when each motive drives rejection, we focused on people’s tendency to form moral impressions rapidly. We hypothesized that the deterrence motive would drive rejection when the negative impression of those who have made unfair offers is uncertain, while the retribution motive would drive rejection when the impression is certain. The result of an online experiment (N = 199) of a repeated mini-ultimatum game did not support our hypothesis; the certainty of the negative impression did not have significant effects on rejection of unfairness. We discuss the implications of this result, incorporating the results of exploratory analyses regarding self-reported motives.Lead, Human Behavior and Evolution Society of Japan, Mar. 2021, Letters on Evolutionary Behavioral Science, 12(1) (1), 12 - 17[Refereed]Scientific journal
- Lead, Elsevier BV, Dec. 2019, Personality and Individual Differences, 151, 109501 - 109501[Refereed]Scientific journal
- People differ in how sensitive they are to justice or injustice, how easily they ruminate on injustice, and how strongly they feel justice-related emotions such as anger and guilt. This individual difference can be measured by the Justice Sensitivity Inventory (JSI; Schmitt et al., 2010), which is divided into four components: sensitivity to becoming a victim of injustice, sensitivity to observing injustice, sensitivity to passively benefiting from injustice, and sensitivity to actively committing injustice. Each sensitivity has a different effect on various aspects of human behavior (e.g., cooperation) as well as mental and physical health. JSI is available in German, English, Chinese, and many other languages, but not in Japanese. This study (n = 453) aimed to develop a Japanese version of JSI (JSI-J) and a short version of it, examining their reliability and validity. They were confirmed to be reliable and valid, except for some items. An effective usage of JSI-J and its short version will be discussed.Lead, The Japanese Psychological Association, Dec. 2019, The Japanese journal of psychology, 90(5) (5), 503 - 512[Refereed]Scientific journal
- Lead, Dec. 2018, Journal of Human Environmental Studies, 16(2) (2), 77 - 82, Japanese[Refereed]Scientific journal
- Feb. 2024, 日本グルダイ学会会報64号2023年度優秀学会発表賞＜ロング・スピーチ部門＞受賞コメント
- May 2022, 日本社会心理学会会報229号
- Dec. 2021, 日本グルダイ学会会報60号
- Oct. 2021, 日本社会心理学会会報228号
- Mar. 2020, 日本社会心理学会会報222号
■ Lectures, oral presentations, etc.
- Society for Personality and Social Psychology 2024, Feb. 2024Do people perceive paternalistic rules as more effective for others than for themselves?Poster presentation
- The 69th Annual Convention of the Japanese Group Dynamics Association, Sep. 2023How people share burdens when their ability varies in a volunteer's dilemma *Winner of the Excellent Presentation AwardOral presentation
- The 87th Annual Convention of the Japanese Psychological Association, Sep. 2023Who in a group takes on a task that must be done and when? Computational modeling of decision making in a volunteer’s dilemma *Winner of the Excellent Presentation AwardPoster presentation
- Society for Personality and Social Psychology 2023, Feb. 2023Getting rid of anonymity increases efficient provision of a public good in a volunteer’s dilemmaPoster presentation
- The 86th Annual Convention of the Japanese Psychological Association, Sep. 2022The effect of the amount and balance of social support on subjective well-being of older Japanese adults *Winner of the Excellent Presentation AwardPoster presentation
- Society for Personality and Social Psychology 2022, Feb. 2022Why do people prefer net-benefit equality but cannot achieve it in the asymmetric volunteer’s dilemma?Poster presentation
- The 67th Annual Convention of the Japanese Group Dynamics Association, Sep. 2021How much should and does the “strongest” member incur a cost for the group in an asymmetric volunteer’s dilemma? *Winner of the Excellent Presentation AwardOral presentation
- The 85th Annual Convention of the Japanese Psychological Association, Sep. 2021The effect of the certainty of the proposer’s negative impression on the responder’s motivation to reject unfair offers: An examination using repeated ultimatum gamesPoster presentation
- The 62nd Annual Meeting of the Japanese Society of Social Psychology, Aug. 2021Ideal and reality of distribution of labor in a group: An examination using asymmetric volunteer’s dilemma gamesPoster presentation
- The 14th Biennial Conference of the Asian Association of Social Psychology, Jul. 2021People prefer equality in asymmetric volunteer’s dilemmasPoster presentation
- The 11th Annual Meeting of the Society for Tokyo Young Psychologists, Mar. 2021How much should and does each member incur a cost for their group in the volunteer’s dilemma?
- Society for Personality and Social Psychology 2021, Feb. 2021Who incurs a cost for their group and when? The effect of justice sensitivity and previous interactions with other members on people’s behavior in a volunteer’s dilemma
- The 13th Annual Meeting of the Human Behavior and Evolution Society of Japan, Dec. 2020Are women more willing to cooperate than men when it does not require skill? An application of the costly signaling theory
- The 61st Annual Meeting of the Japanese Society of Social Psychology, Nov. 2020Social perception in a volunteer's dilemma in everyday life
- The 61st Annual Meeting of the Japanese Society of Social Psychology, Nov. 2020Developing a scale to measure symbolic ableism in Japan
- The 84th Annual Convention of the Japanese Psychological Association, Sep. 2020Understanding people’s attitudes toward a “data-driven” society based on trust and technology acceptance models
- The 84th Annual Convention of the Japanese Psychological Association, Sep. 2020Determinants of acceptance of automated vehicles
- The 84th Annual Convention of the Japanese Psychological Association, Sep. 2020Factors for mothers to continue team support in elementary school children's community sports: Effects of sports harassment and the justice sensitivity *Winner of the Excellent Presentation Award
- Society for Personality and Social Psychology 2020, Feb. 2020, English, International conferenceHow people evaluate volunteers and shirkers in the volunteer’s dilemma? The effect of perceived cost of volunteeringPoster presentation
- The 23rd Experimental Social Science Conference, Nov. 2019, EnglishRejecting an unfair offer allows you to gain self/other-focused material/social rewards: An integrative framework of motivation for rejecting unfair offers in ultimatum gamesPoster presentation
- The 60th Annual Meeting of the Japanese Society of Social Psychology, Nov. 2019, Japanese, Domestic conferenceIndividual differences of willingness to volunteer in a volunteer’s dilemma: The positive and negative effects of justice sensitivity
- The 36th Annual Meeting of Japanese Cognitive Science Society, Sep. 2019, Japanese, Domestic conferenceImplicit and Explicit Attitudes toward Blood TiesPublic symposium
- The 13th biennial Asian Association of Social Psychology, Jul. 2019, English, International conference“Take one for the team!” The positive and negative effects of justice sensitivity in a volunteer’s dilemma in workplace scenariosPoster presentation
- The 9th Asian Conference on Psychology & the Behavioral Sciences, Mar. 2019, English, Tokyo, Japan, International conferenceWho “volunteers”? The effect of justice sensitivity in a volunteer’s dilemma at a university dormOral presentation
- The 9th Asian Conference on Psychology & the Behavioral Sciences, Mar. 2019, English, Tokyo, Japan, International conferenceDevelopment of a Japanese version of the Justice Sensitivity Inventory (JSI-J)Poster presentation
- Society for Personality and Social Psychology 2019, Feb. 2019, English, Portland, USA, International conferenceEgoistic motives of concerning injustice for others: Justice sensitivity and self-consciousnessPoster presentation
- The 59th Annual Meeting of the Japanese Society of Social Psychology, Aug. 2018, Japanese, Osaka, Japan, Domestic conferenceBecause of the “bad blood”?: Genetic essentialism and associative stigma of an ex-convict’s childrenPoster presentation
- Human Behavior and Evolution Society JapanApr. 2020 - Present
- Asian Association of Social PsychologyApr. 2019 - Present
- Society for Personality and Social PsychologyApr. 2018 - Present
- The Japanese Group Dynamics AssociationApr. 2018 - Present
- The Japanese Society of Social PsychologyApr. 2018 - Present
- The Japanese Psychological AssociationApr. 2018 - Present
- Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Apr. 2022 - Mar. 2024Fairness in volunteer's dilemmas
- Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Apr. 2020 - Mar. 2022Fairness in volunteer's dilemmas
- Asian Association of Social Psychology, Summer School Research Grant, Dec. 2019 - Jul. 2021How much should and does the “strongest” member incur a cost for the group in an asymmetric volunteer’s dilemma?
- Foundation for the Fusion of Science and Technology, Research Grant for Research on Simulation and Gaming Using Advanced and Creative Methods 2019, Dec. 2019 - Dec. 2020Why does unfairness occur in volunteer's dilemmas?
- Society for Personality and Social Psychology Graduate Travel Award 2022Feb. 2022
- Society for Personality and Social Psychology International Registration Award 2021Feb. 2021
- Two-year Scholarship for Outstanding Achievement, Awarded by Japan Student Services OrganizationApr. 2020
- Travel Grant for the 83rd Annual Meeting of the Japanese Psychological Association, Awarded by Japanese Psychological Association Early Career Psychologists NetworkSep. 2019
- Asian Association of Social Psychology Travel Grant for Summer SchoolJul. 2019
- Young Researcher’s Scholarship Award 2018, Awarded by Japanese Society of Social PsychologyJul. 2019
- Travel Grant for International Conferences 2019, Awarded by Japanese Psychological AssociationJul. 2019
- International Academic Forum ScholarshipMar. 2019
- Travel Grant for International Conferences 2018, Awarded by Japanese Group Dynamics AssociationOct. 2018
- Scholarship for Studying Abroad 2016, Awarded by Tobitate Young Ambassador Program of the Ministry of Education, Culture, Sports, Science and TechnologySep. 2016 - Jun. 2017
- Scholarship for Studying Abroad 2016, Awarded by JosuikaiSep. 2016 - May 2017