First published in 2000. Routledge is an imprint of Taylor & Francis, an informa company.

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)

Altruism has both an evolutionary and a psychological meaning. As the term is used in evolutionary theory, a trait is deemed altruistic if it reduces the fitness of the actor and enhances the fitness of someone else. In its psychological sense, the thesis that we have altruistic ultimate motives asserts that we care about the welfare of others, not just as a means of enhancing our own well-being, but as an end in itself. In Unto Others (hereafter UO), we consider (...) both evolutionary altruism (Part I) and psychological altruism (Part II) from an evolutionary perspective. We propose a multilevel selection theory to explain how altruism can evolve from group selection, based on Darwin’s solution to the problem. Our presentation of multilevel selection theory expands the range of topics beyond altruism in other respects as well. In Part I1 of UO, we evaluate the arguments, both conceptual and empirical, that philosophers and psychologists have advanced in an attempt to choose between psychological egoism and motivational pluralism. We conclude that these arguments are inconclusive. (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.

In philosophy, the textbook case for the discussion of human motivation is the examination (and almost always, the refutation) of psychological egoism. The arguments have become part of the folklore of our tribe, from their inclusion in countless introductory texts. [...] One of my central aims has been to define the issues empirically, so we do not just settle them by definition. Although I am inclined at present to put my bets on the reward-event theory, with its internalism, monism, and (...) causal primacy of satisfaction, I think we are very far from knowing enough to settle these questions concerning motivation, human or otherwise. The winds of science will blow where they may. In the meantime, we can be a bit more circumspect about what we put in our tribal folklore. (shrink)

This is a new release of the original 1949 edition.

A discussion of egoism and altruism as related both to ethical theory and moral psychology. Williams considers and rejects various arguments for and against the existence of egoistic motives and the rationality of someone motivated by self-interest. He ultimately attempts to give a more Humean defense of altruism, as opposed to the more Kantian defenses found in Thomas Nagel, for example.

Psychologists have long assumed that the motivation for all intentional action, including all action intended to benefit others, is egoistic. People benefit others because, ultimately, to do so benefits themselves. The empathy-altruism hypothesis challenges this assumption. It claims that empathic emotion evokes truly altruistic motivation, motivation with an ultimate goal ofbenefiting not the self but the person for whom empathy is felt. Logical and psychological distinctions between egoism and altruism are reviewed, providing a conceptualframeworkfor empirical tests for the existence of (...) altruism. Results of empirical tests to date are summarized; these results provide impressive support for the empathy-altruism hypothesis. We conclude that the popular and parsimonious explanation ofprosocial motivation in terms ofuniversal egoism must give way to a pluralistic explanation that includes altruism as well as egoism. Implications of such a pluralism are briefly noted, not only for our understanding ofprosocial motivation but also for our understanding of human nature and of the emotion-motivation link. (shrink)

Sober and Wilson argue that neither psychological evidence nor philosophical arguments provide grounds for rejecting psychological hedonism, but evolution by natural selection is unlikely to have led to such a single source of motivation. In order to turn their piecemeal discussion of into a serious argument, Sober and Wilson need a general procedure for mapping alternative accounts of motivation into egoistic hedonistic accounts. That is the only way to demonstrate that there will always be an available hedonistic account no matter (...) what the psychological evidence. But such a general procedure, if available, must block their argument for . So, the more persuasive the case for , the less persuasive the case for. (shrink)