Mathematical foundations of moral preferences

One-shot anonymous unselfishness in economic games is commonly explained by social preferences, which assume that people care about the monetary pay-offs of others. However, during the last 10 years, research has shown that different types of unselfish behaviour, including cooperation, altruism, truth-telling, altruistic punishment and trustworthiness are in fact better explained by preferences for following one''s own personal norms—internal standards about what is right or wrong in a given situation. Beyond better organizing various forms of unselfish behaviour, this moral preference hypothesis has recently also been used to increase charitable donations, simply by means of interventions that make the morality of an action salient. Here we review experimental and theoretical work dedicated to this rapidly growing field of research, and in doing so we outline mathematical foundations for moral preferences that can be used in future models to better understand selfless human actions and to adjust policies accordingly. These foundations can also be used by artificial intelligence to better navigate the complex landscape of human morality.     

Synchrony and the social tuning of compassion.

Although evidence has suggested that synchronized movement can foster cooperation, the ability of synchrony to increase costly altruism and to operate as a function of emotional mechanisms remains unexplored. We predicted that synchrony, due to an ability to elicit low-level appraisals of similarity, would enhance a basic compassionate response toward victims of moral transgressions and thereby increase subsequent costly helping behavior on their behalf. Using a manipulation of rhythmic synchrony, we show that synchronous others are not only perceived to be more similar to oneself but also evoke more compassion and altruistic behavior than asynchronous others experiencing the same plight. These findings both support the view that a primary function of synchrony is to mark others as similar to the self and provide the first empirical demonstration that synchrony-induced affiliation modulates emotional responding and altruism. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

The influence of altruism on influenza vaccination decisions

Game theory is based on the assumption that individuals act according to self-interest and make decisions that maximize their personal payoffs. To test this fundamental assumption, we conducted a survey study in the context of influenza vaccination decisions. Contrary to the assumption of self-interest, we found that altruism plays an important role in vaccination decisions. Nevertheless, altruistic motivation has not yet been considered in epidemiological models, in predictions of vaccination decisions or in the design of vaccination policies. To determine the impact of altruism on the adherence to optimal vaccination policies and on resulting disease burden, we incorporated altruism into a game-theoretic epidemiological model of influenza vaccination. We found that altruism significantly shifted vaccination decisions away from individual self-interest and towards the community optimum, greatly reducing the total cost, morbidity and mortality for the community. Therefore, promoting altruism could be a potential strategy to improve public health outcomes.     

Do chimpanzees (Pan troglodytes) spontaneously take turns in a reciprocal cooperation task?

Reciprocity is considered to be an explanation for altruism toward nonkin. Although there have been many theoretical studies and reciprocity is arguably prevalent in humans, little experimental work has investigated the proximate mechanism of reciprocity in nonhuman animals. The authors tested whether pairs of chimpanzees (Pan troglodytes) would achieve reciprocal cooperation, that is, whether chimpanzees take turns playing donor and recipient roles in an other-rewarding token insertion task. In this task, when a chimpanzee inserts a token into a vending machine, a food reward is delivered to another chimpanzee in an adjacent booth. For 3 pairs of chimpanzees, token insertion persisted in an alternate condition, in which the participants necessarily had to insert tokens alternately, but not in a free condition, in which they freely took turns inserting tokens. In the free condition, one of the chimpanzees was observed to perform a possible solicitation toward the partner who had previously inserted fewer tokens. These findings suggest that there is some difficulty in the occurrence of reciprocal cooperation in chimpanzees. Chimpanzees, differently from humans, might play a donor’s role only on the partner’s request, but not spontaneously. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Extrinsic rewards undermine altruistic tendencies in 20-month-olds.

The current study investigated the influence of rewards on very young children's helping behavior. After 20-month-old infants received a material reward during a treatment phase, they subsequently were less likely to engage in further helping during a test phase as compared with infants who had previously received social praise or no reward at all. This so-called overjustification effect suggests that even the earliest helping behaviors of young children are intrinsically motivated and that socialization practices involving extrinsic rewards can undermine this tendency. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Does empathy trigger only altruistic motivation? How about selflessness or justice?

A key question in research on empathy is what interpersonal motivations might be activated by empathy. Does empathy promote only a concern with other's outcomes ("altruism"), as well as decreased concern with one's own outcomes ("selflessness"), or an increased concern with equality in outcomes ("egalitarianism")? These interpersonal motivations were assessed with a series of experimental games, and our manipulations of empathy paralleled earlier research on the empathy-altruism model. Participants received a (fictitious) note from another person outlining that he or she is coping with the anticipated loss of his or her father in conditions that emphasized taking the other's perspective or an objective perspective (high and low empathy), whereas another group of participants received no note (no empathy). Consistent with our hypotheses, results revealed that a concern with another's well-being (altruism) was greater in the two empathy conditions than in the no-empathy condition. Further, the authors observed no effect of empathy on selfishness or egalitarianism, two motivations that were substantially present independent of empathy. Thus, the findings suggest that empathy adds altruistic motivation to already existing selfish and egalitarian motivation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Blood donation is an act of benevolence rather than altruism.

Objectives: Blood donation is described as an archetypal altruistic behavior, and recruitment/retention campaigns emphasize altruism. Here, a benevolence hypothesis for blood donation (both the donor and recipient benefit) rather than the altruism hypothesis (only the recipient gains) is proposed. Design: Three United Kingdom-based studies contrasted benevolence and altruism: (a) a 6-month prospective study of blood donor behavior (Study 1: N = 957), (b) a cross-sectional study of blood donors' intentions (Study 2: N = 333), and (c) an experimental study examining the effect of benevolent and altruistic messages on willingness to help across high- and low-cost helping behaviors for committed and noncommitted blood donors (Study 3: N = 200). Main Outcome: Donor behavior and intentions-willingness. Measures: Beliefs in personal and societal benefit (Time 1) and actual donations (Time 2) were assessed in Study 1; beliefs in benevolence, altruism, hedonism, and kinship along with donation intentions were assessed in Study 2; and empathy, donor commitment, and willingness to donate blood, money, fund-raise, and staff a telephone helpline were assessed in Study 3. Results: Beliefs in personal rather than societal benefit predicted actual future donation. A path model showed that only beliefs in benevolence were associated with intentions to donate. Committed blood donors were more willing to donate blood when exposed to a benevolent message rather than an altruistic one. This effect was not observed for other forms of helping. Conclusions: The benevolence hypothesis is supported, suggesting that blood donor motivation is partly selfish. Blood donation campaigns should focus on benevolent rather than purely altruistic messages. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

一种时间最短的交通网络路径求解方法

随着科技的不断发展和人民生活水平的不断提高,汽车的保有量日益增加,交通堵塞问题愈加严重,造成了时间的浪费。为了防止城市交通拥堵,节约驾驶员出行的时间,将路网信息表示成矩阵的形式,建立了车辆行驶时间目标函数。运用拉格朗日乘子法求解目标函数,从而得到各车辆的行驶路径。最后,利用MATLAB实验仿真,在目标函数最小的情况下,能得到车辆的行驶路径,当有利他因子时,更节省出行时间。