Henrich et al.'s findings are generally consistent with the findings of other experimental field studies. However, the methodological variations deployed across field sites produced several systematic biases in their results. Hence, although the project is destined to become a watershed study, their results should be interpreted prudently.

In this paper I explore the psychology of ritual performance and present a simple graphical model that clarifies several issues in William Irons’s theory of religion as a “hard-to-fake” sign of commitment. Irons posits that religious behaviors or rituals serve as costly signals of an individual’s commitment to a religious group. Increased commitment among members of a religious group may facilitate intra-group cooperation, which is argued to be the primary adaptive benefit of religion. Here I propose a proximate explanation for (...) how individuals are able to pay the short-term costs of ritual performance to achieve the long-term fitness benefits offered by religious groups. The model addresses three significant problems raised by Irons’s theory. First, the model explains why potential free-riders do not join religious groups even when there are significant net benefits that members of religious groups can achieve. Second, the model clarifies how costly a ritual must be to achieve stability and prevent potential free-riders from joining the religious group. Third, the model suggests why religious groups may require adherents to perform private rituals that are not observed by others. Several hypotheses generated from the model are also discussed. (shrink)

In this paper I explore the psychology of ritual performance and present a simple graphical model that clarifies several issues in William Irons’s theory of religion as a “hard-to-fake” sign of commitment. Irons posits that religious behaviors or rituals serve as costly signals of an individual’s commitment to a religious group. Increased commitment among members of a religious group may facilitate intra-group cooperation, which is argued to be the primary adaptive benefit of religion. Here I propose a proximate explanation for (...) how individuals are able to pay the short-term costs of ritual performance to achieve the long-term fitness benefits offered by religious groups. The model addresses three significant problems raised by Irons’s theory. First, the model explains why potential free-riders do not join religious groups even when there are significant net benefits that members of religious groups can achieve. Second, the model clarifies how costly a ritual must be to achieve stability and prevent potential free-riders from joining the religious group. Third, the model suggests why religious groups may require adherents to perform private rituals that are not observed by others. Several hypotheses generated from the model are also discussed. (shrink)

This paper considers religion in relation to four recurrent traits: belief systems incorporating supernatural agents and counterintuitive concepts, communal ritual, separation of the sacred and the profane, and adolescence as a preferred developmental period for religious transmission. These co-occurring traits are viewed as an adaptive complex that offers clues to the evolution of religion from its nonhuman ritual roots. We consider the critical element differentiating religious from non-human ritual to be the conditioned association of emotion and abstract symbols. We propose (...) neurophysiological mechanisms underlying such associations and argue that the brain plasticity of human adolescence constitutes an “experience expectant” developmental period for ritual conditioning of sacred symbols. We suggest that such symbols evolved to solve an ecological problem by extending communication and coordination of social relations across time and space. (shrink)

In this paper we examine the merit of bargaining theory, in its economic and ecological forms, as a model for understanding variation in the frequency of participation in cooperative fishing among men of Ifaluk atoll in Micronesia. Two determinants of bargaining power are considered: resource control and a bargainer’s utility gain for his expected share of the negotiated resource. Several hypotheses which relte cultural and life-course parameters to bargaining power are tested against data on the frequency of cooperative sail-fishing participation. (...) Consistent with predictions generated from bargaining theory, we show that (1) age is negatively correlated with cooperative fishing participation, (2) men of highranking clans and men with high levels of education fish less than men of low-ranking clans and less-educated men, (3) men with high expected utility gains from fishing returns fish more than men with low expected utility gains, (4) number of dependents is positively correlated with cooperative fishing participation, and (5) the number of young genetic offspring residing with a man is positively correlated with cooperative fishing participation, whereas the number of genetic offspring more than 13 years old who are residing with a man is negatively correlated with cooperative fishing participation. (shrink)

We argue that religious ritual's ability to facilitate communication and the pervasiveness of its basic characteristics across societies, as well as its precedence in other social species, suggests that religious behavior is more than a mere by-product. Religious constructs constitute associationally conditioned mnemonics that trigger neuroendocrine responses which motivate religious behaviors. The adaptive value of these constructs resides in their utility as memorable and emotionally evocative primes.

We argue that a closer look at the practices and tools that humans use to support willpower, and the cultural contexts in which they are employed, can broaden the applicability of Ainslie's theory and facilitate the development of more effective self-control techniques. To support our argument, we examine Alcoholics Anonymous's method of temptation resistance known as “playing the tape through”.

A theory of rationality is a theory that evaluates instances of reasoning as rational, irrational, or (ir)rational to some degree. Theories can be categorized as rule-based or consequentialist. Rule-based theories say that rational reasoning accords with certain rules (e.g., of logic or probability). Consequentialist theories say that rational reasoning tends to produce good consequences. For instance, the reliabilist takes rationality to be reasoning that tends to produce mostly true beliefs. The pragmatist takes it to be reasoning that tends to produce (...) mostly useful beliefs. This article reviews some of the features and the challenges of rule-based, reliabilist, and pragmatist theories of rationality. (shrink)

This paper considers religion in relation to four recurrent traits: belief systems incorporating supernatural agents and counterintuitive concepts, communal ritual, separation of the sacred and the profane, and adolescence as a preferred developmental period for religious transmission. These co-occurring traits are viewed as an adaptive complex that offers clues to the evolution of religion from its nonhuman ritual roots. We consider the critical element differentiating religious from non-human ritual to be the conditioned association of emotion and abstract symbols. We propose (...) neurophysiological mechanisms underlying such associations and argue that the brain plasticity of human adolescence constitutes an “experience expectant” developmental period for ritual conditioning of sacred symbols. We suggest that such symbols evolved to solve an ecological problem by extending communication and coordination of social relations across time and space. (shrink)

Several influential psychologists have attempted to estimate to what extent human happiness levels are directly controlled by genes by comparing the happiness levels of identical twins raised apart. If we discover that the happiness levels of identical twins raised apart tend to be closer than the happiness levels of fraternal twins raised apart, this is taken as evidence that average happiness levels are largely controlled by genes. However, if it turns out that identical twins' happiness levels tend to be substantially (...) different, as different as fraternal twins raised apart, it has been argued that this implies that the environment largely determines happiness levels. I contend that this interpretation of the data rests on a set of questionable, closely related assumptions: a) that pairs of identical twins raised apart are raised in substantially different environments; b) that genetically identical twins aren't identical in other pertinent ways; and c) that average levels of affect that are correlated with certain sets of genes in the environments the twin studies were conducted in will be correlated with those genes in other relevant environments because those genes govern average affect levels. In this paper, I will show that these assumptions are false and explain how to properly go about investigating the contingent causal links between genes and happiness. In the end, I argue that there is no good evidence that our genes delimit our hedonic potential and that the fact that this misinterpretation of the data has been widely disseminated is potentially harmful to human well-being. (shrink)

Ritual behaviors of some form exist in every society known to anthropologists. Despite this universality, we have little understanding of how ritual behavior varies within populations or across the lifespan, nor the determinants of this variation. Here we test hypotheses derived from life history theory by using behavioral observations and oral interview data concerning participant variation in Fijian kava-drinking ceremonies. We predicted that substantial variation in the frequency and duration of participation would result from (1) trade-offs with reproduction and (2) (...) the intrinsic status differences between ritual participants. We demonstrate that when controlling for household composition, men with young offspring participated less frequently and exhibited greater variance in their time spent at ceremonies than men without young children. However, men with a larger number of total dependents in their household participated more frequently than those with fewer. Moreover, we found that men’s ascribed rank, level of education, and reliance on wage labor all significantly predict their frequency of attendance. We also found that the number of dependents a man has in his household is positively correlated with total food production, and the amount of kava he cultivates. In general, these results suggest that ritual participation is part of an important strategy employed by Fijian men for both achieving status and developing social alliances. Variation in participation in kava ceremonies by Fijian men therefore reflects the constraints of their current life history condition and their inherited rank. (shrink)

Many scientists have argued that they can determine to what extent human happiness levels are controlled by genes by comparing the average happiness levels of identical twins raised apart. If we discover that identical twins raised apart tend to be more hedonically similar than fraternal twins raised apart, this is interpreted as evidence for the thesis that genes have a strong influence on our happiness levels. If identical twins are hedonically dissimilar, as dissimilar as fraternal twins raised apart, this has (...) been taken as evidence for the thesis that happiness levels are determined in large part by the environment. I shall show that that these interpretations of these studies rely on a set of false assumptions. There is no good evidence our genes determine how happy we can be. (shrink)

There has been increasing interest in the evolutionary study of religion, but perfunctory fractionalization has limited our ability to explain how and why religion evolved, evaluate religion’s current adaptive value, and assess its role in contemporary decision-making. To move beyond piecemeal analyses of religion, I have recently offered an integrative evolutionary framework that approaches religions as adaptive systems. I argue that religions are an adaptive complex of traits consisting of cognitive, neurological, affective, behavioral, and developmental features that are organized into (...) a self-regulating feedback system. Here I explore four advantages of this systemic approach to religion: it avoids definitional problems that have plagued the study of religion, affords a contextual understanding of religious belief, informs current debates within the evolutionary study of religion, and provides links to both the natural sciences and humanities. I argue that the systemic approach offers the strongest potential for real progress and broad application of evolutionary theory to the study of religion. (shrink)

The fish-sharing patterns on Ifaluk Atoll underscore several limitations of the explanations of food sharing offered by Gurven and suggest that non-foraging labor activities may provide insights into reciprocity and punishment relevant for understanding food-sharing patterns. I also argue that future food-sharing studies should focus on signaling rather than resource holding potential (RHP).

Anthropological tests of patch choice models from optimal foraging theory have primarily employed acquisition rates as the currency of the model. Where foragers share their returns, acquisition rates may not be similar to consumption rates and thus may not be an appropriate currency to use when modeling foraging decisions. Indeed, on Ifaluk Atoll the distribution patterns of fish vary by fishing method and location. Previous analyses of Ifaluk patch choice decisions suggested that if Ifaluk fishers are trying to maximize their (...) production rates they should rarely torch fish for dogtoothed tuna. However, some men do spend considerable time and energy exploiting the dogtoothed tuna patch. To improve our understanding of the constraints and motivations influencing men’s decisions to exploit this patch, here I use per capita consumption rates as a currency, rather than production rates, to evaluate predictions generated from a patch choice model. Results indicate that although fish caught in other patches are more widely distributed than fish caught in the dogtoothed tuna patch, the consumption rates of torch fishers and their kin are still considerably lower than the consumption rates of men pursuing fish in other patches. Although these results are unable to explain why Ifaluk men exploit the dogtoothed tuna patch, an important explanatory hypothesis is eliminated. (shrink)

We argue that limiting the theory of extreme self-sacrifice to two determinants, namely, identity fusion and group threats, results in logical and conceptual difficulties. To strengthen Whitehouse's theory, we encourage a more holistic approach. In particular, we suggest that the theory include exogenous sociopolitical factors and constituents of the religious system as additional predictors of extreme self-sacrifice.

We argue that ritual is not a by-product as Boyer & Lienard (B&L) claim, but rather an evolved adaptation for social communication that facilitates non-agonistic social interactions among non-kin. We review the neurophysiological effects of ritual and propose neural structures and networks beyond the cortical-striato-pallidal-thalamic circuit (CSPT) likely to be implicated in ritual. The adaptationist approach to ritual offers a more parsimonious model for understanding these effects as well as the findings B&L present. (Published Online February 8 2007).

Juslin & Vll (J&V) advance our understanding of the proximate mechanisms underlying emotional responses to music, but fail to integrate their findings into a comprehensive evolutionary model that addresses the adaptive functions of these responses. Here we offer such a model by examining the ontogenetic relationship between music, ritual, and symbolic abstraction and their role in facilitating social coordination and cooperation.

Life history theory aims to explain the relationship between life events, recognizing that the fertility and growth schedules of organisms are dependent on environmental conditions and an organism’s ability to extract resources from its environment. Using models from life history theory, we predict life expectancy to be positively correlated with educational investments and negatively correlated with adolescent reproduction and total fertility rates. Analyses of UN data from 193 countries support these predictions and demonstrate that, although variation is evident across world (...) regions, strong interactions exist among life expectancy, reproductive investments, and educational attainment, and these relationships occur independently of economic pressures and disease burdens. The interactions are strongest, however, in countries with a life expectancy of ≥60 years as these countries tend to have stable economies and a limited HIV/AIDS burden. These findings suggest that policies aimed at influencing education and reproductive decisions should consider environmental characteristics that drive people’s expectations about their longevity. (shrink)

McKay & Dennett (M&D) observe that beliefs need not be true in order to evolve. We connect this insight with Schelling's work on cooperative commitment to suggest that some beliefs are best approached as social goals. We explain why a social-interactive perspective is important to explaining the dynamics of belief formation and revision among situated partners.

Current evolutionary and cognitive theories of religion posit that supernatural agent concepts emerge from cognitive systems such as theory of mind and social cognition. Some argue that these concepts evolved to maintain social order by minimizing antisocial behavior. If these theories are correct, then people should process information about supernatural agents’ socially strategic knowledge more quickly than non-strategic knowledge. Furthermore, agents’ knowledge of immoral and uncooperative social behaviors should be especially accessible to people. To examine these hypotheses, we measured response-times (...) to questions about the knowledge attributed to four different agents—God, Santa Claus, a fictional surveillance government, and omniscient but non-interfering aliens—that vary in their omniscience, moral concern, ability to punish, and how supernatural they are. As anticipated, participants respond more quickly to questions about agents’ socially strategic knowledge than non-strategic knowledge, but only when agents are able to punish. (shrink)

The evolution of religious traditions may be partially explained by out-group avoidance due to pathogen stress. However, many religious rituals may increase rather than decrease performers' susceptibility to infection. Moreover, religions often spread through proselytizing, which requires out-group interaction; and in other cases, the benefits of economic exchange increase religious pluralism and social interactions with out-groups.

Challenges to Moral and Religious Belief contains fourteen original essays by philosophers, theologians, and social scientists on challenges to moral and religious belief from disagreement and evolution. Three main questions are addressed: Can one reasonably maintain one's moral and religious beliefs in the face of interpersonal disagreement with intellectual peers? Does disagreement about morality between a religious belief source, such as a sacred text, and a non-religious belief source, such as a society's moral intuitions, make it irrational to continue trusting (...) one or both of those belief sources? Should evolutionary accounts of the origins of our moral beliefs and our religious beliefs undermine our confidence in their veracity? This volume places challenges to moral belief side-by-side with challenges to religious belief, sets evolution-based challenges alongside disagreement-based challenges, and includes philosophical perspectives together with theological and social science perspectives, with the aim of cultivating insights and lines of inquiry that are easily missed within a single discipline or when these topics are treated in isolation. The result is a collection of essays--representing both skeptical and non-skeptical positions about morality and religion--that move these discussions forward in new and illuminating directions. -/- Contributors: Robert Audi, University of Notre Dame; Michael Bergmann, Purdue University; Sarah Brosnan, Georgia State University; William FitzPatrick, University of Rochester; John Hare, Yale University; Timothy P. Jackson, Emory University; Patrick Kain, Purdue University; Jordan Kiper, University of Connecticut; Dustin Locke, Claremont McKenna College; Charles Mathewes, University of Virginia; Mark C. Murphy, Georgetown University; John Pittard, Yale Divinity School; Walter Sinnott-Armstrong, Duke University; Richard Sosis, University of Connecticut; Sharon Street, New York University; Joshua Thurow, University of Texas at San Antonio; Ralph Wedgwood, University of Southern California. (shrink)

La couverture indique :"L'infini est le sujet le plus vaste que l'imagination puisse embrasser. Il a tout le temps fasciné les hommes, qu'ils soient artistes, philosophes ou scientifiques. Mais l'infini se manifeste-t-il vraiment dans la réalité physique, ou est-il seulement un concept de notre imagination, comme le pensait Aristote? Des artistes comme Escher, des écrivains comme Borges ont tenté de le représenter, mais c'est Georg Cantor qui assoit fermement l'infini dans le paysage des mathématiques et nous dévoile ses propriétés étranges (...) et magiques. L'univers est, par excellence, le lieu où l'infini se manifeste. Dans un univers infini, nous serions confrontés au paradoxe de l'éternel retour, où chacun de nous posséderait un nombre infini de sosies. Les avancées en physique de ces dernières décennies ont donné au mot "infini" un sens nouveau. Il se réfère non seulement à notre univers, mais aussi à une infinité d'univers parallèles, le tout formant un vaste et fantastique "multivers". A ces sujets vertigineux, Trinh Xuan Thuan apporte ses réflexions avec la pédagogie lumineuse, à la fois scientifique, philosophique et poétique qui lui est coutumière et qui fait le grand succès de La Mélodie secrète, du Chaos et l'harmonie, et, plus récemment, du Cosmos et le lotus.". (shrink)

Introduction: The many faces of human nature / Agustín Fuentes and Aku Visala Chapter 1. Off human nature / Jonathan Marks. Response I. On your marks... get set, we’re off human nature / James M. Calcagno ; Response II. Rethinking human nature : comments on Jonathan Marks’s anti-essentialism / Phillip R. Sloan ; Response III. Off human nature and on human culture : the importance of the concept of culture to science and society / Robert Sussman and Linda Sussman Chapter (...) 2. "To human" is a verb / Tim Ingold. Response I. Free and easy wandering : humans, humane education, and designing in harmony with the nature of the way / Susan D. Blum ; Response II. On human natures : anthropological and Jewish musings / Richard Sosis ; Response III. The humanifying adventure : a response to Tim Ingold / Markus Mühling ; Response IV. The ontogenesis of human moral becoming / Darcia Narvaez Chapter 3. Recognizing the complexity of personhood : complex emergent developmental linguistic relational neurophysiologicalism / Warren Brown and Brad D. Strawn. Response I. "Self-organizing personhood" and many loose ends / Lluis Oviedo ; Response II. A last hurrah for dualism? / Kelly James Clark ; Response III. Why the foundational question about human nature is open and empirical / Carl Gillett Chapter 4. Human origins and the emergence of a distinctively human imagination : theology and the archaeology of personhood / J. Wentzel van Huyssteen. Response I. Constructing the face, creating the collective : Neolithic mediation of personhood / Ian Kuijt ; Response II. Imago Dei and the glabrous ape / Douglas Hedley Chapter 5. What is human nature for? / Grant Ramsey. Response I. The difficulties of forsaking normativity / Neil Arner ; Response II. Some remarks on human nature and naturalism / Aku Visala Epilogues. Putting evolutionary theory to work in investigating human nature / Agustín Fuentes ; Moving us forward? / Celia Deane-Drummond. (shrink)

Ce livre traite de l'image, mais aussi, plus generalement, de la copie, du double, de la representation, du calque, du sosie... La philosophie, a juste titre, a mis en garde contres ces si dangereux reflets. Ne doit-on pas preferer ce qui est a ce qui l'imite ou le mime? Mefions-nous des leurres! Cependant, on est revenu sur cette seculaire et injuste condamnation. La technologie moderne a peu a peu sauve celle qu'on avait trop inferiorisee et eloignee. Et quelle victoire! (...) L'image numerique, donc celle de synthese, l'arrache a une servitude que les philosophes classiques et meme plus modernes avaient scellee. L'electro-optique, la tomodensitometrie (scannographie), l'holographie, entre autres, multiplient les prouesses liberatrices. Dans le passe, la photographie, voire la radiographie avaient deja ebranle les anciennes positions. La guerre commencait. L'imagerie deferle donc, ainsi que l'industrie noire des contrefacons, des plagiats, des pseudo-repliques, du pastiche. Les trucages et la fraude. Mais ou situer aujourd'hui le vrai et le faux? Comment distinguer le modele et son equivalent? Les vieilles frontieres, comme on le montrera, s'estompent. Quel branle-bas et quelle fete aussi! On a voulu prendre acte de cette nouveaute. Hatons-nous, malgre le danger de nous y perdre, d'engager la philosophie que nous croyons reticente dans ce tourbillon. (shrink)

Dans cet article, je montre que le concept du double joue un rôle crucial, mais secret dans le Moïse de Freud. Freud prétend que Moïse a été assassiné par son peuple pour être remplacé ultérieurement par un autre Moïse. Cependant, je soutiens que cette logique d’assassinat et de dédoublement caractérise toutes les figures héroïques qui ne sont que des doubles les unes des autres. Le véritable objectif de Freud est de s’établir lui-même comme le double héroïque de Moïse. De cette (...) manière, il tente de garantir la survie de son héritage puisque, même s’il meurt, d’autres doubles viendraient pour continuer son œuvre. (shrink)