日本の社会心理学者たちは，活発な研究活動を展開・公表しており，その成果は日本語による論文であれば例えば日本社会心理学会の機関誌である「社会心理学研究」等の学会誌に掲載され，また学術書として公刊されています．一方，当然のことながら学問に国境はなく，特に近年では国際的な論文誌や書籍にその成果が掲載されることも増えてきました．しかし，こうした国際的成果をくまなく知ることは，あまりにそのフィールドが広いためにあまり容易ではありませんでした．
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Miyajima & Yamaguchi (2017)
Miyajima, T. (宮島健), & Yamaguchi, H. (山口裕幸) (2017).
I Want to but I Won't: Pluralistic Ignorance Inhibits Intentions to Take Paternity Leave in Japan.
取りたいけど取らない: 多元的無知が日本における男性の育児休業の取得意図を抑制する
Frontiers in Psychology, 8, 1508.
doi: 10.3389/fpsyg.2017.01508
The number of male employees who take paternity leave in Japan has been low in past decades. However, the majority of male employees actually wish to take paternity leave if they were to have a child. Previous studies have demonstrated that the organizational climate in workplaces is the major determinant of male employees’ use of family-friendly policies, because males are often stigmatized and fear receiving negative evaluation from others. While such normative pressure might be derived from prevailing social practices relevant to people’s expectation of social roles (e.g., “Men make houses, women make homes”), these social practices are often perpetuated even after the majority of group members have ceased to support them. The perpetuation of this unpopular norm could be caused by the social psychological phenomenon of pluralistic ignorance. While researches have explored people’s beliefs about gender roles from various perspectives, profound understanding of these beliefs regarding gender role norms, and the accuracy of others’ beliefs remains to be attained. The current research examined the association between pluralistic ignorance and the perpetually low rates of taking paternity leave in Japan. Specifically, Study 1 (n = 299) examined Japanese male employees’ (ages ranging from the 20 s to the 40 s) attitudes toward paternity leave and to estimate attitudes of other men of the same age, as well as behavioral intentions (i.e., desire and willingness) to take paternity leave if they had a child in the future. The results demonstrated that male employees overestimated other men’s negative attitudes toward paternity leave. Moreover, those who had positive attitudes toward taking leave and attributed negative attitudes to others were less willing to take paternity leave than were those who had positive attitudes and believed others shared those attitudes, although there was no significant difference between their desires to take paternity leave. Study 2 (n = 425) replicated these results and further indicated that they could not be explained by the participants’ needs to be socially desirable. Together, our findings suggest that pluralistic ignorance occurs in the context of taking paternity leave in Japanese men, and this leads to the low use of available paternity leave.
プレスリリース（九州大学）：男性の育休取得を阻んでいる一因とは?～間違った思い込みから生まれる心理的壁～
Kosugi(2017)
Kosugi,K.E.（小杉考司）(2017). Asymmetrical triadic relationship based on the structural difficulty. 構造的困難度に基づく非対称な三者関係の分析 Behaviormetrika,44(2),1--17. doi: 10.1007/s41237-017-0033-9Using Bayesian inference, this study aims to estimate the magnitude of the cognitive load when a person perceives asymmetric social relations. Some empirical evidence relating to balance theory has shown that a balanced state is comparatively easier to memorize than an unbalanced one. In this study, since a balanced state is defined by structural complexity, an experimental hypothesis was set whereby asymmetric social relationships have different difficulty levels depending on structural complexity. The balanced state of an asymmetric relation as structural difficulty is formally derived from the eigenvalue structure of a Hermitian matrix. Asymmetric triadic relations are modeled as featuring three kinds of structural difficulties according to the eigenvalue decomposition of the Hermitian matrix and pattern-specific difficulties. The differences among the structural difficulties were not sufficiently significant to exceed pattern-specific difficulties, but the Bayes factor of the informational hypothesis of this research yielded positive effects.
Kawamoto(2017)
Kawamoto, T. (川本大史) (2017).
What happens in your mind and brain when you are excluded from a social activity?
社会的に排斥されるとあなたのこころと脳で何が起こるのだろうか？
Frontiers for Young Minds, 5:46.
doi: 10.3389/frym.2017.00046
In school and in everyday life, we sometimes experience rejection by classmates, or we might see someone being excluded from an activity. What do excluded individuals feel? How does the brain process information about being socially excluded? In the past few decades, psychologists and social neuroscientists have investigated the influence of social exclusion on our mind, brain, and behavior. Social exclusion is a complex and ambiguous phenomenon, and therefore, we process information about it dynamically and often cope with it flexibly. In this article, I have described the dynamic effects of social exclusion on our mind, brain, and behavior by developing a model of what happens in the brain and the actions people take upon experiencing social exclusion.
Tanibe et al. (2017)
Tanibe, T. (谷辺哲史), Hashimoto, T. (橋本剛明), & Karasawa, K. (唐沢かおり) (2017).
We perceive a mind in a robot when we help it.
ロボットを助けるとロボットに心を感じる
PLoS ONE, 12(7): e0180952.
People sometimes perceive a mind in inorganic entities like robots. Psychological research has shown that mind perception correlates with moral judgments and that immoral behaviors (i.e., intentional harm) facilitate mind perception toward otherwise mindless victims. We conducted a vignette experiment (N = 129; Mage = 21.8 ± 6.0 years) concerning human-robot interactions and extended previous research’s results in two ways. First, mind perception toward the robot was facilitated when it received a benevolent behavior, although only when participants took the perspective of an actor. Second, imagining a benevolent interaction led to more positive attitudes toward the robot, and this effect was mediated by mind perception. These results help predict what people’s reactions in future human-robot interactions would be like, and have implications for how to design future social rules about the treatment of robots.
Matsunaga et al. (2017)
Matsunaga, M., Ishii, K. (石井敬子), Ohtsubo, Y. (大坪庸介), Noguchi, Y., Ochi, M. (越智美早), & Yamasue, H. (2017).
Association between salivary serotonin and the social sharing of happiness.
唾液セロトニンと幸せの社会的共有との関連
PloS ONE, 12(7), e0180391.
doi: 10.1371/journal.pone.0180391
Although human saliva contains the monoamine serotonin, which plays a key role in the modulation of emotional states, the association between salivary serotonin and empathic ability remains unclear. In order to elucidate the associations between salivary serotonin levels, trait empathy, and the sharing effect of emotions (i.e., sharing emotional experiences with others), we performed a vignette-based study. Participants were asked to evaluate their happiness when they experience several hypothetical life events, whereby we manipulated the valence of the imagined event (positive, neutral, or negative), as well as the presence of a friend (absent, positive, or negative). Results indicated that the presence of a happy friend significantly enhanced participants’ happiness. Correlation analysis demonstrated that salivary serotonin levels were negatively correlated with happiness when both the self and friend conditions were positive. Correlation analysis also indicated a negative relationship between salivary serotonin levels and trait empathy (particularly in perspective taking), which was measured by the Interpersonal Reactivity Index. Furthermore, an exploratory multiple regression analysis suggested that mothers’ attention during childhood predicted salivary serotonin levels. Our findings indicate that empathic abilities and the social sharing of happiness decreases as a function of salivary serotonin levels.
Oishi et al. (2017).
Oishi, S., Yagi, A. (八木彩乃), Komiya, A. (小宮あすか), Kohlbacher, F., Kusumi, T. (楠見孝), & Ishii, K (石井敬子). (2017).
Does a major earthquake change job preferences and human values?
大地震は職業の好みや人間の価値観を変えるのか？
European Journal of Personality, 31, 258-265.
doi: 10.1002/per.2102
Does a major natural disaster change human values and job preferences? The present studies examined whether the experience of a natural disaster experience shifts people’s values and job preferences toward pro-social directions. In Study 1 (cross-temporal analysis), we analysed job application data in nine cities in Japan over 12 years and found that the popularity of pro-social occupations (e.g. firefighter) increased after the Great Hanshin–Awaji Earthquake in 1995, in particular the area hit hardest by the quake. In Study 2 (a large national survey), we found that Japanese respondents who had experienced a major earthquake are more likely to hold a pro-social job than those who never experienced a major earthquake. Together, the current findings suggest that the experience of a major natural disaster shifts human values from the egocentric to the allocentric direction, which in turn could result in a social structure that values pro-social occupations.
Ohtsubo & Yamaguchi (2017).
Ohtsubo, Y.（大坪庸介）, & Yamaguchi, C.（山口千晶） (2017).
People are more generous to a partner who pays attention to them.
Evolutionary Psychology, 15 (1).
doi: 10.1177/1474704916687310
People use relatively low-cost signals to maintain close relationships, in which they engage in costlier exchanges of tangible support. Paying attention to a partner allows an individual to communicate his or her interest in the relationship with the partner. Previous studies have revealed that when Person A pays attention to Person B, B’s feeling of intimacy toward A increases. If social attention strengthens the bond between A and B, it is predicted that A’s attention will also increase B’s generous behavior toward A. This study tested this prediction. Participants first engaged in a collaborative task using computers. In the task, the putative partner (a computer program) either paid or did not pay attention to participants (high attention condition vs. low attention condition). In the control condition, the partner could not choose when to pay attention to participants. They then played three rounds of the dictator game with the partner. Confirming the previous finding, perceived intimacy was highest in the high attention condition, in the middle in the control condition, and lowest in the low attention condition. More importantly, participants in the high attention condition decided to give more resources to their partner than those in the low attention condition (but the difference between the high attention condition and the control condition was not significant). In addition, self-reported intimacy was positively correlated with the resource allocated to the partner. The results of this study demonstrated that social attention fosters a partner’s generosity.
Yamaguchi et al. (2017).
Yamaguchi, M.（山口真奈）, Smith, A.（スミス，アダム）, & Ohtsubo, Y.（大坪庸介） (2017).
Loneliness predicts insensitivity to partner commitment.
Personality and Individual Differences, 105, 200-207.
doi: 10.1016/j.paid.2016.09.047
People attend to their partners’ pro-relationship behaviors (or commitment signals) which in turn leads to a positive adjustment in perceived strength of interpersonal bonds. This bond-confirming effect is stronger when the commitment signal entails some high cost (e.g., receiving an expensive birthday present), and by contrast, it is weaker when the commitment signal entails a low cost (e.g., receiving a wish of “Happy Birthday”). The present study explored how loneliness moderates sensitivity to commitment signals as well as their absence (i.e., situations where partners fail to signal commitment despite the demands of the situation). Studies with a Japanese student sample (Study 1), a Japanese community sample (Study 2), and an American sample drawn from users of Amazon Mechanical Turk (Study 3) found that loneliness is associated with an insensitivity to commitment signals: The lonelier the participant, the less likely he or she was to positively adjust perceived bond strength in response to a commitment signal. This relative insensitivity was observed irrespective of the costliness of the signal. On the other hand, loneliness did not predict differences in sensitivity to the absence of commitment signals. Implications of these results for the loneliness literature are discussed.
Kusumi et al. (2017).
Kusumi, T.（楠見 孝）, Hirayama, R., & Kashima, Y.(2017).
Risk Perception and Risk Talk: The Case of the Fukushima Daiichi Nuclear Radiation Risk.
リスクの認知と会話：福島原発事故による放射線リスク
Risk Analysis: An International Journal. (電子版)
doi:10.1111/risa.12784
Individuals’ perceptions and their interpersonal communication about a risk event, or risk talk, can play a significant role in the formation of societal responses to the risk event. As they formulate their risk opinions and speak to others, risk information can circulate through their social networks and contribute to the construction of their risk information environment. In the present study, Japanese citizens’ risk perception and risk talk were examined in the context of the Fukushima Daiichi nuclear radiation risk. We hypothesized and found that the risk information environment and risk literacy (i.e., competencies to understand and use risk information) interact to influence their risk perception and risk talk. In particular, risk literacy tends to stabilize people’s risk perceptions and their risk communications. Nevertheless, there were some subtle differences between risk perception and communication, suggesting the importance of further examination of interpersonal risk communication and its role in the societal responses to risk events.
Shiraki & Igarashi (2017).
Shiraki, Y.（白木優馬）& Igarashi, T.（五十嵐祐） (2017).
We Can’t Return Evil for Good: The Comparison between Direct and Indirect Reciprocity.
恩を仇で返せない：直接互恵性と間接互恵性の比較
Letters on Evolutionary Behavioral Science, 8(1), 4-7.
There are two distinct evolutionary mechanisms of altruistic behavior: direct and indirect reciprocity. Humans are motivated not only to reciprocate benefits to benefactors but also to behave altruistically for the maintenance or improvement of their reputation. This study compared the two evolutionary mechanisms of altruistic behavior. Three scenario-based experiments on diverse samples (Japanese undergraduates in Experiment 1, Japanese crowdsourcing workers in Experiment 2, and crowdsourcing workers worldwide in Experiment 3) were conducted by manipulating (1) reciprocity between participants and a colleague (reciprocal or non-reciprocal) and (2) the colleague’s reputation in the workplace (good or bad). When participants received a reciprocal request from their colleague to help, they tended to accept it, even if the colleague had a bad reputation among others. On the other hand, participants were less accepting of a non-reciprocal request from a colleague with a bad reputation than a colleague with a good reputation. These results clearly indicate that humans prioritize the maintenance of direct reciprocal relationships over group-based reputations.