Why do people behave in moral ways in some circumstances, but not in others? In order to account fully for morality, Dennis Krebs departs from traditional approaches to morality that suggest that children acquire morals through socialization, cultural indoctrination, and moral reasoning. He suggests that such approaches can be subsumed, refined, and revised gainfully within an evolutionary framework. Relying on evolutionary theory, Krebs offers an account of how notions of morality originated in the human species. He updates Darwin's early ideas about how dispositions to obey authority, to control antisocial urges, and to behave in altruistic and cooperative ways originated and evolved, then goes on to update Darwin's account of how humans acquired a moral sense.Krebs explains why the theory of evolution does not dictate that all animals are selfish and immoral by nature. On the contrary, he argues that moral behaviors and moral judgments evolved to serve certain functions. Krebs examines theory and research on the evolution of primitive forms of prosocial conduct displayed by humans and other animals, then discusses the evolution of uniquely human prosocial behaviors. He describes how a sense of morality originated during the course of human evolution through strategic social interactions among members of small groups, and how it was expanded and refined in modern societies, explaining how this sense gives rise to culturally universal and culturally relative moral norms. Krebs argues that although humans' unique cognitive abilities endow them with the capacity to engage in sophisticated forms of moral reasoning, people rarely live up their potential in their everyday lives. Four conceptions of what it means to be a moral person are identified, with the conclusion that people are naturally inclined to meet the standards of each conception under certain conditions. The key to making the world a more moral place lies in creating environments in which good guys finish first and cheaters fail to prosper.

A noted anthropologist explains how our sense of ethics has changed over the course of human evolution. By the author of Hierarchy of the Forest.

Moral thinking pervades our practical lives, but where did this way of thinking come from, and what purpose does it serve? Is it to be explained by environmental pressures on our ancestors a million years ago, or is it a cultural invention of more recent origin? In The Evolution of Morality, Richard Joyce takes up these controversial questions, finding that the evidence supports an innate basis to human morality. As a moral philosopher, Joyce is interested in whether any implications follow from this hypothesis. Might the fact that the human brain has been biologically prepared by natural selection to engage in moral judgment serve in some sense to vindicate this way of thinking—staving off the threat of moral skepticism, or even undergirding some version of moral realism? Or if morality has an adaptive explanation in genetic terms—if it is, as Joyce writes, "just something that helped our ancestors make more babies"—might such an explanation actually undermine morality's central role in our lives? He carefully examines both the evolutionary "vindication of morality" and the evolutionary "debunking of morality," considering the skeptical view more seriously than have others who have treated the subject. Interdisciplinary and combining the latest results from the empirical sciences with philosophical discussion, The Evolution of Morality is one of the few books in this area written from the perspective of moral philosophy. Concise and without technical jargon, the arguments are rigorous but accessible to readers from different academic backgrounds. Joyce discusses complex issues in plain language while advocating subtle and sometimes radical views. The Evolution of Morality lays the philosophical foundations for further research into the biological understanding of human morality.

By the time Christianity became a political and cultural force in the Roman Empire, it had come to embody a new moral vision. This wise and eloquent book describes the formative years--from the crucifixion of Jesus to the end of the second century of the common era--when Christian beliefs and practices shaped their unique moral order. Wayne A. Meeks examines the surviving documents from Christianity's beginnings (some of which became the New Testament) and shows that they are largely concerned with the way converts to the movement should behave. Meeks finds that for these Christians, the formation of morals means the formation of community; the documents are addressed not to individuals but to groups, and they have among their primary aims the maintenance and growth of these groups. Meeks paints a picture of the process of socialization that produced the early forms of Christian morality, discussing many factors that made the Christians feel that they were a single and "chosen" people. He describes, for example, the impact of conversion; the rapid spread of Christian household cult-associations in the cities of the Roman Empire; the language of Christian moral discourse as revealed in letters, testaments, and "moral stories"; the rituals, meetings, and institutionalization of charity; the Christians' feelings about celibacy, sex, and gender roles; and their sense of the end-time and final judgment. In each of these areas Meeks seeks to determine what is distinctive about the Christian viewpoint and what is similar to the moral components of Greco-Roman or Jewish thought.

Develops further John Rawls' intuition that our sense of justice is rooted in our evolutionary past and presents a new theory of morality based on evolutionary biology.

A provocative new account of how morality evolved What is morality? Where does it come from? And why do most of us heed its call most of the time? In Braintrust, neurophilosophy pioneer Patricia Churchland argues that morality originates in the biology of the brain. She describes the "neurobiological platform of bonding" that, modified by evolutionary pressures and cultural values, has led to human styles of moral behavior. The result is a provocative genealogy of morals that asks us to reevaluate the priority given to religion, absolute rules, and pure reason in accounting for the basis of morality. Moral values, Churchland argues, are rooted in a behavior common to all mammals—the caring for offspring. The evolved structure, processes, and chemistry of the brain incline humans to strive not only for self-preservation but for the well-being of allied selves—first offspring, then mates, kin, and so on, in wider and wider "caring" circles. Separation and exclusion cause pain, and the company of loved ones causes pleasure; responding to feelings of social pain and pleasure, brains adjust their circuitry to local customs. In this way, caring is apportioned, conscience molded, and moral intuitions instilled. A key part of the story is oxytocin, an ancient body-and-brain molecule that, by decreasing the stress response, allows humans to develop the trust in one another necessary for the development of close-knit ties, social institutions, and morality. A major new account of what really makes us moral, Braintrust challenges us to reconsider the origins of some of our most cherished values.

The Arthur M. Sackler Colloquia of the National Academy of Sciences address scientific topics of broad and current interest, cutting across the boundaries of traditional disciplines. Each year, four or five such colloquia are scheduled, typically two days in length and international in scope. Colloquia are organized by a member of the Academy, often with the assistance of an organizing committee, and feature presentations by leading scientists in the field and discussions with a hundred or more researchers with an interest in the topic. Colloquia presentations are recorded and posted on the National Academy of Sciences Sackler colloquia website and published on CD-ROM. These Colloquia are made possible by a generous gift from Mrs. Jill Sackler, in memory of her husband, Arthur M. Sackler.