It is a challenge to explain how evolutionary altruism can evolve by the process of natural selection, since altruists in a group will be less fit than the selfish individuals in the same group who receive benefits but do not make donations of their own. Darwin proposed a theory of group selection to solve this puzzle. Very simply, even though altruists are less fit than selfish individuals within any single group, groups of altruists are more fit than groups of selfish (...) individuals. If a population is subdivided into many groups that vary in their altruistic tendencies, altruism will be favored at the level of selection among groups even as it is being disfavored at the level of selection among individuals within groups. Darwin’s scenario became the basis for a theoretical framework called multilevel selection theory. (shrink)

It is a challenge to explain how evolutionary altruism can evolve by the process of natural selection, since altruists in a group will be less fit than the selfish individuals in the same group who receive benefits but do not make donations of their own. Darwin proposed a theory of group selection to solve this puzzle. Very simply, even though altruists are less fit than selfish individuals within any single group, groups of altruists are more fit than groups of selfish (...) individuals. If a population is subdivided into many groups that vary in their altruistic tendencies, altruism will be favored at the level of selection among groups even as it is being disfavored at the level of selection among individuals within groups. Darwin’s scenario became the basis for a theoretical framework called multilevel selection theory. (shrink)

The authors demonstrate that unselfish behavior is in fact an important feature of both biological and human nature. Their book provides a panoramic view of altruism throughout the animal kingdom--from self-sacrificing parasites to the human capacity for selflessness--even as it explains the evolutionary sense of such behavior.

It is a challenge to explain how evolutionary altruism can evolve by the process of natural selection, since altruists in a group will be less fit than the selfish individuals in the same group who receive benefits but do not make donations of their own. Darwin proposed a theory of group selection to solve this puzzle. Very simply, even though altruists are less fit than selfish individuals within any single group, groups of altruists are more fit than groups of selfish (...) individuals. If a population is subdivided into many groups that vary in their altruistic tendencies, altruism will be favored at the level of selection among groups even as it is being disfavored at the level of selection among individuals within groups. Darwin’s scenario became the basis for a theoretical framework called multilevel selection theory. (shrink)

Building on a model first proposed by Gary Johnson, it is hypothesized that religious institutions demanding celibacy and other forms of altruism from members take advantage of human predispositions to favor genetic relatives in order to maintain and reinforce these desired behaviors in non-kin settings. This is accomplished through the institutionalization of practices to manipulate cues through which such relatives are regularly identified. These cues are association, phenotypic similarity, and the use of kin terms. In addition, the age of recruits (...) and their contact with actual kin are factors that relate to kinship recognition and that are similarly manipulated by institutions in order to reinforce altruistic behavior directed toward non-kin. Support for this set of predictions is presented from historical and ethnographic sources on monastic life in Buddhism, Christianity, and Hinduism, as well as Islamic dervish groups, the Essenes, Shakers, and others. Potential implications of the model for understanding the development of religious institutions are preliminarily explored by reviewing Joachim Wach's model of religious developmental stages as well as some of the literature on the relationship between individualism and communalism in incipient religious organizations, in light of the kin-cue manipulation model. (shrink)

Reciprocity theory (RT) and costly signaling theory (CST) provide different explanations for the high status of pro-community altruists: RT proposes that altruists are positively and negatively sanctioned by others, whereas CST proposes that altruists are attractive to others. Only RT, however, is beset by first- and higher-order free rider problems, which must be solved in order for RT to explain status allocations. In this paper, several solutions to RT’s free rider problems are proposed, and data about status allocations to Ecuadorian (...) Shuar pro-community altruists are analyzed in light of RT and CST. These data confirm that perceived pro-community altruists are indeed high status and suggest that (1) community residents skillfully monitor the altruism of coresidents, (2) residents who engage in opportunities to broadcast desirable qualities are high status only to the extent that they are considered altruistic, and (3) individuals who sanction coresidents based on coresidents’ contributions to the community are themselves relatively high status. To a greater extent than CST, RT straightforwardly predicts all of these results. (shrink)

Several attempts have recently been made to explain moral systems and moral sentiments in light of evolutionary biological theory. It may be helpful to modify and extend this project with the help of a theory of communication developed by ethologists. The core of this approach is the idea that signals are best seen as attempts to manipulate others rather than as attempts to inform them. This addition helps to clarify some problematic areas in the evolutionary study of morals, and it (...) generates new, testable predictions about moral statements. (shrink)

The study of reciprocal altruism, or the exchange of goods and services between individuals, requires attention to both evolutionary explanations and proximate mechanisms. Evolutionary explanations have been debated at length, but far less is known about the proximate mechanisms of reciprocity. Our own research has focused on the immediate causes and contingencies underlying services such as food sharing, grooming, and cooperation in brown capuchin monkeys and chimpanzees. Employing both observational and experimental techniques, we have come to distinguish three types of (...) reciprocity. Symmetry-based reciprocity is cognitively the least complex form, based on symmetries inherent in dyadic relationships (e.g., mutual association, kinship). Attitudinal reciprocity, which is more cognitively complex, is based on the mirroring of social attitudes between partners and is exhibited by both capuchin monkeys and chimpanzees. Finally, calculated reciprocity, the most cognitively advanced form, is based on mental scorekeeping and is found only in humans and possibly chimpanzees. (shrink)

Despite wide acceptance that the attributes of living creatures have appeared through a cumulative evolutionary process guided chiefly by natural selection, many human activities have seemed analytically inaccessible through such an approach. Prominent evolutionary biologists, for example, have described morality as contrary to the direction of biological evolution, and moral philosophers rarely regard evolution as relevant to their discussions. -/- The Biology of Moral Systems adopts the position that moral questions arise out of conflicts of interest, and that moral systems (...) are ways of using confluences of interest at lower levels of social organiation to deal with conflicts of interest at higher levels. Moral systems are described as systems of indirect reciprocity: humans gain and lose socially and reproductively not only by direct transactions, but also by the reputations they gain from the everyday flow of social interactions. -/- The author develops a general theory of human interests, using senescence and effort theory from biology, to help analye the patterning of human lifetimes. He argues that the ultimate interests of humans are reproductive, and that the concept of morality has arisen within groups because of its contribution to unity in the context, ultimately, of success in intergroup competition. He contends that morality is not easily relatable to universals, and he carries this argument into a discussion of what he calls the greatest of all moral problems, the nuclear arms race. (shrink)

This book presents an alternative to conventional ideas about the evolution of the human intellect.

Second, this collection of cognitive programs evolved in the Pleistocene to solve the adaptive problems regularly faced by our hunter-gatherer ancestors-...

Important features of the self-concept can be located outside of the individual and inside close or related others. The authors use this insight to reinterpret data previously said to support the empathy-altruism model of helping, which asserts that empathic concern for another results in selflessness and true altruism. That is, they argue that the conditions that lead to empathic concern also lead to a greater sense of self-other overlap, raising the possibility that helping under these conditions is not selfless but (...) is also directed toward the self. In 3 studies, the impact of empathic concern on willingness to help was eliminated when oneness--a measure of perceived self-other overlap--was considered. Path analyses revealed further that empathic concern increased helping only through its relation to perceived oneness, thereby throwing the empathy-altruism model into question. The authors suggest that empathic concern affects helping primarily as an emotional signal of oneness. (shrink)

A model is presented to account for the natural selection of what is termed reciprocally altruistic behavior. The model shows how selection can operate -against the cheater (non-reciprocator) in the system. Three instances of altruistic behavior are discussed, the evolution of which the model can explain: (1) behavior involved in cleaning symbioses; (2) warning cries in birds: and (3) human reciprocal altruism. Regarding human reciprocal altruism, it is shown that the details of the psychological system that regulates this altruism can (...) be explained by the model. Specifically, friendship,d islike, moralistic aggression, gratitude, sympathy, trust, suspicion, trustworthiness, aspects of guilt, and some forms of dishonesty and hypocrisy can be explained as important adaptations to regulate the altruistic system. Each individual human is seen as possessing altruistic and cheating tendencies, the expression of which is sensitive to developmental variables that were selected to set the tendencies at a balance appropriate to the local social and ecological environment. (shrink)

Contemporary suicide terrorists from the Middle East are publicly deemed crazed cowards bent on senseless destruction who thrive in poverty and ignorance. Recent research indicates they have no appreciable psychopathology and are as educated and economically well-off as surrounding populations. A first line of defense is to get the communities from which suicide attackers stem to stop the attacks by learning how to minimize the receptivity of mostly ordinary people to recruiting organizations.

Suicide attack is the most virulent and horrifying form of terrorism in the world today. The mere rumor of an impending suicide attack can throw thousands of people into panic. This occurred during a Shi‘a procession in Iraq in late August 2005, causing hundreds of deaths. Although suicide attacks account for a minority of all terrorist acts, they are responsible for a majority of all terrorism-related casualties, and the rate of attacks is rising rapidly across the globe. During 2000–2004, there (...) were 472 suicide attacks in 22 countries, killing more than 7,000 and wounding tens of thousands. Most have been carried out by Islamist groups claiming religious motivation, also known as jihadis. Rand Corp. vice president and terrorism analyst Bruce Hoffman has found that 80 percent of suicide attacks since 1968 occurred after the September 11 attacks, with jihadis representing 31 of the 35 responsible groups. More suicide attacks occurred in 2004 than in any previous year, and 2005 has proven even more deadly, with attacks in Iraq alone averaging more than one per day, according to data gathered by the U.S. military. The July 2005 London and Sinai bombings, a second round of bombings at tourist destinations in Bali in October, coordinated hotel bombings in Jordan in November, the arrival of suicide bombings in Bangladesh in December, a record year of attacks in Afghanistan, and daily bombings in Iraq have spurred renewed interest in suicide terrorism, with recent analyses stressing the strategic logic, organizational structure, and rational calculation involved. Whereas they once primarily consisted of organized campaigns by militarily weak forces aiming to end the perceived occupation of their homeland, as argued by University of Chicago political scientist Robert Pape in Dying to Win: The Strategic Logic of Suicide Terrorism, suicide attacks today serve as banner actions for a thoroughly modern, global diaspora inspired by religion and claiming the role of vanguard for a massive, media-driven transnational political awakening. Living mostly in the diaspora and undeterred by the threat of retaliation against original home populations, jihadis, who are frequently middle-class, secularly well educated, but often “born-again” radical Islamists, including converts from Christianity, embrace apocalyptic visions for humanity's violent salvation. In Muslim countries and across western Europe, bright and idealistic Muslim youth, even more than the marginalized and dispossessed, internalize the jihadi story, illustrated on satellite television and the Internet with the ubiquitous images of social injustice and political repression with which much of the Muslim world's bulging immigrant and youth populations intimately identifies. From the suburbs of Paris to the jungles of Indonesia, I have interviewed culturally uprooted and politically restless youth who echo a stunningly simplified and decontextualized message of martyrdom for the sake of global jihad as life's noblest cause. They are increasingly as willing and even eager to die as they are to kill. The policy implications of this change in the motivation, organization, and calculation of suicide terrorism may be as novel as hitherto neglected. Many analysts continue to claim that jihadism caters to the destitute and depraved, the craven and criminal, or those who “hate freedom.” Politicians and pundits have asserted that jihadism is nihilistic and immoral, with no real program or humanity. Yet, jihadism is none of these things. Do we really understand the causes of today's suicide terrorism? Do suicide attacks stem mainly from a political cause, such as military occupation? Do they need a strong organization, such as Al Qaeda? What else could be done to turn the rising tide of martyrdom? (shrink)

Human societies are based on cooperation among large numbers of genetically unrelated individuals. This behavior is puzzling from an evolutionary perspective. Because cooperators are..

Robert Boyd*†, Herbert Gintis‡, Samuel Bowles§, and Peter J. Richerson¶.