Language, like other human traits, could only have evolved during one or more stages of development. We enlist the theoretical framework of human life history to account for certain aspects of linguistic evolution, with special reference to initial phases in the process. It is hypothesized that selection operated at several developmental stages, the earlier ones producing new behaviors that were reinforced by additional, and possibly more powerful, forms of selection during later stages, especially adolescence and early adulthood. (...) Peer commentaries have provided opportunities to explain human life history more comprehensively, and to add details to our account of spoken language. We made no attempt to explain syntax in the target article, but we propose here that selection for “vocal plumage” may have increased our species’ capacity for utterance complexity, a development that would have benefited all levels of language. (shrink)

The negative co‐variation of life‐history traits such as fecundity and lifespan across species suggests the existence of ubiquitous trade‐offs. Mechanistically, trade‐offs result from the need to differentially allocate limited resources to traits like reproduction versus self‐maintenance, with selection favoring the evolution of optimal allocation mechanism. Here I discuss the physiological (endocrine) mechanisms that underlie optimal allocation rules and how such rules evolve. The hormone testosterone may mediate life‐history trade‐offs due to its pleiotropic actions in (...) male vertebrates. Conservation in the actions of testosterone in vertebrates has prompted the ‘evolutionary constraint hypothesis,’ which assumes that testosterone signaling mechanisms and male traits evolve as a unit. This hypothesis implies that the actions of testosterone are similar across sexes and species, and only the levels of circulating testosterone concentrations change during evolution. In contrast, the ‘evolutionary potential hypothesis’ proposes that testosterone signaling mechanisms and male traits evolve independently. In the latter scenario, the linkage between hormone and traits itself can be shaped by selection, leading to variation in trade‐off functions. I will review recent case studies supporting the evolutionary potential hypothesis and suggest micro‐evolutionary experiments to unravel the mechanistic basis of life‐history evolution. BioEssays 29: 133–144, 2007. © 2007 Wiley Periodicals, Inc. (shrink)

In order to address why the number of patients suffering from anxiety and depression are seemingly exploding in Western, educated, industrialized, rich, and democratic (WEIRD) countries, it is sensible to look at the evolution of human fearfulness responses. Here, we draw on Veit's pathological complexity framework to advance Grossmann's goal of re-characterizing human fearfulness as an adaptive trait.

The National Longitudinal Study of Adolescent Health data were used to test predictions from life history theory. We hypothesized that (1) in young adulthood an emerging life history strategy would exist as a common factor underlying many life history traits (e.g., health, relationship stability, economic success), (2) both environmental harshness and unpredictability would account for unique variance in expression of adolescent and young adult life history strategies, and (3) adolescent life (...) history traits would predict young adult life history strategy. These predictions were supported. The current findings suggest that the environmental parameters of harshness and unpredictability have concurrent effects on life history development in adolescence, as well as longitudinal effects into young adulthood. In addition, life history traits appear to be stable across developmental time from adolescence into young adulthood. (shrink)

Baumard's new explanation of the Industrial Revolution shows that Life History Theory holds great potential. Here, I suggest two related hypotheses for examination. One is that there are long-term roots of slow life traits and preferences. The other is that Life History Theory can explain other aspects of economic modernity such as the Scientific Revolution and bureaucratic states. If so, then Life History Theory offers a way to reconcile several bodies of evidence (...) and lines of explanation into a coherent general account of economic modernity. (shrink)

Reproductive division of labor has been proposed to play a key role for evolutionary transitions in individuality (ETIs). This chapter provides a guide to a theoretical model that addresses the role of a tradeoff between life-history traits in selecting for a reproductive division of labor during the transition from unicellular to multicellular organisms. In particular, it focuses on the five key assumptions of the model, namely (1) fitness is viability times fecundity; (2) collective traits are linear (...) functions of their cellular counterparts; (3) there is a tradeoff between cell viability and fecundity; (4) cell contribution to the collective is optimal; and (5) there is an initial reproductive cost in large collectives. Thereafter the chapter contrasts two interpretations of the model in the context of ETIs. Originally, the model was interpreted as showing that during the transition to multicellularity the fitness of the lower-level (the cells) is “transferred” to the higher level (the collective). Despite its apparent intuitiveness, fitness transfer may obscure actual mechanisms in metaphorical language. Thus, an alternative and more conservative interpretation of the model that focuses on cell traits and the evolutionary constraints that link them is advocated. In addition, it allows for pursuing subsequent questions, such as the evolution of development. (shrink)

Globally, mortality and fertility rates generally fall as resource abundance increases. This pattern represents an evolutionary paradox insofar as resource-rich ecological contexts can support higher numbers of offspring, a component of biological fitness. This paradox has not been resolved, in part because the relationships between fertility, life history strategies, reproductive behavior, and socioeconomic conditions are complex and cultural-historically contingent. We aim to understand how we might make sense of this paradox in the specific context of late-twentieth-century, mid–demographic transition (...) Chile. We use distribution-specific generalized linear models to analyze associations between fertility-related life-history traits—number of offspring, ages at first and last reproduction, average interbirth interval, and average number of live births per reproductive span year—and socioeconomic position (SEP) using data from a cohort of 6,802 Chilean women born between 1961 and 1970. We show that Chilean women of higher SEP have shorter average interbirth intervals, more births per reproductive span year, later age at first reproduction, earlier ages at last reproduction, and, ultimately, fewer children than women of lower SEP. Chilean women of higher SEP consolidate childbearing over a relatively short time span in the middle of their reproductive careers, whereas women of lower SEP tend to reproduce over the entirety of their reproductive lifespans. These patterns may indicate that different SEP groups follow different pathways toward declining fertility during the demographic transition, reflecting different life-history trade-offs in the process. (shrink)

This paper critiques the competing “Grandmother Hypothesis” and “Embodied Capital Theory” as evolutionary explanations of the peculiarities of human life history traits. Instead, I argue that the correct explanation for human life history probably involves elements of both hypotheses: long male developmental periods and lives probably evolved due to group selection for male hunting via increased female fertility, and female long lives due to the differential contribution women’s complex foraging skills made to their children and (...) grandchildren’s nutritional status within groups provisioned by male hunting. (shrink)

Life history theory predicts that greater extrinsic mortality will lead to earlier and higher fertility. To test this prediction, I examine the relationship between life expectancy at birth and several proxies for life history traits (ages at first sex and first marriage, total fertility rate, and ideal number of children), measured for both men and women. Data on sexual behaviors come from the Demographic and Health Surveys (DHS). Two separate samples are analyzed: a cross-sectional (...) sample of 62 countries and a panel sample that includes multiple cross-sectional panels from 48 countries. Multivariate regression analysis is used to control for potential confounding variables. The results provide only partial support for the predictions, with greater support among women than men. However, the prediction is not supported in sub-Saharan African countries, most likely owing to the nonequilibrium conditions observed in sub-Saharan Africa with respect to life expectancy. The applicability of the model to understanding HIV/AIDS risk behaviors is discussed. (shrink)

In evolutionary psychology, it is customary to measure life-history via psychometric inventories such as the Arizona Life History Battery. The validity of this approach has been questioned: it is argued that these measures are not congruent with biological life history events, such as the number of children, age at first birth, or pubertal timing. However, empirical data to test this critique are lacking. We therefore administered the ALHB to a convenience sample of young adults (...) in Serbia. We also collected information on psychosocial-biodemographic life history parameters closely related to biological life history traits: pubertal timing, onset of sexual behavior, short- and long-term mating, number of children, timing of reproduction, parenthood values, and environmental harshness. We found that correlations between these two sets of measures were rare, unsystematic, and mostly low in magnitude. Stable patterns of relations emerged only between the indicators of environmental conditions from both sets of measures. Furthermore, some ALHB indicators were found to be positively related with early fertility, which is incongruent with the conceptual foundation of ALHB. Finally, network analysis and factor analysis within each set of measures revealed different structures and that the hypothesis of unidimensionality, on which the ALHB was founded, cannot be applied to psychosocial-biodemographic life history indicators. Our results support the critique of ALHB as a set of measures lacking validity to capture biodemographic life-history parameters. ALHB measures are indeed relevant for understanding life-history variation, but they cannot be used as a substitute for specific life history characteristics. Our findings are a warning to researchers to use direct measures of biological events in order to measure life-history dynamics. (shrink)

Understanding how traits are integrated at the organismal level remains a fundamental problem at the interface of developmental and evolutionary biology. Hormones, regulatory signaling molecules that coordinate multiple developmental and physiological processes, are major determinants underlying phenotypic integration. The probably best example for this is the lipid-like juvenile hormone (JH) in insects. Here we review the manifold effects of JH, the most versatile animal hormone, with an emphasis on the fruit fly Drosophila melanogaster, an organism amenable to both genetics (...) and endocrinology. JH affects a remarkable number of processes and traits in Drosophila development and life history, including metamorphosis, behavior, reproduction, diapause, stress resistance and aging. While many molecular details underlying JH signaling remain unknown, we argue that studying “hormonal pleiotropy” offers intriguing insights into phenotypic integration and the mechanisms underlying life history evolution. In particular, we illustrate the role of JH as a key mediator of life history trade-offs. BioEssays 27:999–1010, 2005. © 2005 Wiley Periodicals, Inc. (shrink)

The Continuous Parameter Estimation Model is applied to develop individual genomic-level heritabilities for the latent hierarchical structure and developmental dynamics of Life History (LH) strategy LH strategies relate to the allocations of bioenergetic resources into different domains of fitness. LH has moderate to high population-level heritability in humans, both at the level of the high-order Super-K Factor and the lower-order factors, the K-Factor, Covitality Factor, and General Factor of Personality (GFP). Several important questions remain unexplored. We developed measures (...) of genome-level heritabilities employing an American sample of 316 monozygotic (MZ) and 274 dizygotic (DZ) twin dyads and a Swedish sample of 863 MZ and 475 DZ twin dyads. This novel heritability index measures individual genetic transmissibility, therefore opening new avenues for analyzing complex interactions among heritable traits inaccessible to standard structural equations methods. For these samples: (1) moderate to high heritability of factor loadings of Super-K on its lower-order factors is demonstrated, evidencing biological preparedness, genetic accommodation, and the gene-culture coevolution of biased epigenetic rules of development; (2) moderate to high heritability of the magnitudes of the effect of the higher-order factors upon their loadings on their constituent factors, evidencing genetic constraints upon phenotypic plasticity; and (3) that heritability of the LH factors, of factor loadings, and of the magnitudes of the correlations among factors are weaker among those with slower LH speeds, demonstrating that inter-individual variation in transmissibility is a function of individual socioecological selection pressures. (shrink)

The human propensity to take an ethical stance toward oneself and others is found in every known society, yet we also know that values taken for granted in one society can contradict those in another. Does ethical life arise from human nature itself? Is it a universal human trait? Or is it a product of one's cultural and historical context? Webb Keane offers a new approach to the empirical study of ethical life that reconciles these questions, showing how (...) ethics arise at the intersection of human biology and social dynamics. Drawing on the latest findings in psychology, conversational interaction, ethnography, and history, Ethical Life takes readers from inner city America to Samoa and the Inuit Arctic to reveal how we are creatures of our biology as well as our history--and how our ethical lives are contingent on both. Keane looks at Melanesian theories of mind and the training of Buddhist monks, and discusses important social causes such as the British abolitionist movement and American feminism. He explores how styles of child rearing, notions of the person, and moral codes in different communities elaborate on certain basic human tendencies while suppressing or ignoring others."--Publisher's Web site. (shrink)

Conceptions of human nature fall under two broad categories, trait bin accounts and trait cluster accounts. Trait bin accounts take there to be a special bin of traits, one composed of all and only those traits constituting our nature. For those arguing for a trait bin account of human nature, the challenge is to articulate what it is that marks a trait as being in or outside of the bin. For some, the bin is filled by the (...) class='Hi'>traits essential to being human. Others, such as Machery in his contribution to this volume, offer a non-essentialist trait bin conception of human nature. In this chapter, I argue that trait bin approaches to human nature are misguided, that there is no good way of dividing human traits into those that are a part of our nature and those that are not. Instead, I argue for a trait cluster account, which sees human nature not as a special bin of traits, but as the relationship among traits. Under this account, human nature lies in the patterns of trait expression within and across human life histories. This account does a superior job characterizing what humans are like and aligning human nature with the human sciences. (shrink)

The Pythagorean Life is the most extensive surviving source on Pythagoreanism, and has wider interest as an account of the religious aspirations of late antiquity. "...admirably clear translation and sensible introduction"--The Classical...

In The Scientific Life, Steven Shapin argues that people and their virtues matter in late modern science. While scientists struggle to remain objective and impersonal, it is the personal, familiar, and charismatic—the traits once swept aside as vices by the scientifically virtuous—that have come to embody the “truth-speakers” of late modernity. With an enormous and sometimes daunting wealth of primary sources (from technical commentaries to his own sociological fieldwork), Steven Shapin breathes life back into these quotidian virtues. (...) The Scientific Life is as much a disjointed genealogy of scientific virtue as a reminder that trust still matters at the cutting-edge of scientific “future-making.” Shapin’s mastery of historical narrative is clear; anyone interested in the American scientific persona and how it has transformed in the twentieth century would do well to wade patiently through this thick and rewarding text. But hang up your expectations of historical linearity (and, sometimes, thematic coherence) as you weave through motley professionals, theorists, and critics drawn from over a century of science commentators. Perhaps this work is best described as textured: rich in detail, woven intricately, but hardly smooth to the touch. (shrink)

The current research applied a mid-level evolutionary theory that has been successfully employed across numerous animal species—life history theory—in an attempt to understand the Dark Triad personality trait cluster (narcissism, psychopathy, and Machiavellianism). In Study 1 (N = 246), a measure of life history strategy was correlated with psychopathy, but unexpectedly with neither Machiavellianism nor narcissism. Study 2 (N = 321) replicated this overall pattern of results using longer, traditional measures of the Dark Triad traits (...) and alternative, future-discounting indicators of life history strategy (a smaller-sooner, larger-later monetary dilemma and self-reported risk-taking behaviors). Additional findings suggested two sources of shared variance across the Dark Triad traits: confidence in predicting future outcomes and openness to short-term mating. (shrink)

Bourrat and Griffiths :33, 2018) have recently argued that most of the evidence presented by holobiont defenders to support the thesis that holobionts are evolutionary individuals is not to the point and is not even adequate to discriminate multispecies evolutionary individuals from other multispecies assemblages that would not be considered evolutionary individuals by most holobiont defenders. They further argue that an adequate criterion to distinguish the two categories is fitness alignment, presenting the notion of fitness boundedness as a criterion that (...) allows divorcing true multispecies evolutionary individuals from other multispecies assemblages and provides an adequate criterion to single out genuine evolutionary multispecies assemblages. A consequence of their criterion is that holobionts, as conventionally defined by hologenome defenders, are not evolutionary individuals except in very rare cases, and for very specific host-symbiont associations. This paper is a critical response to Bourrat and Griffiths’ arguments and a defence of the arguments presented by holobiont defenders. Drawing upon the case of the hologenomic basis of the evolution of sanguivory in vampire bats, I argue that Bourrat and Griffiths overlook some aspects of the biological nature of the microbiome that justifies the thesis that holobionts are evolutionarily different to other multispecies assemblages. I argue that the hologenome theory of evolution should not define the hologenome as a collection of genomes, but as the sum of the host genome plus some traits of the microbiome which together constitute an evolutionary individual, a conception I refer to as the stability of traits conception of the hologenome. Based on that conception I argue that the evidence presented by holobiont defenders is to the point, and supports the thesis that holobionts are evolutionary individuals. In this sense, the paper offers an account of the holobiont that aims to foster a dialogue between hologenome advocates and hologenome critics. (shrink)

This paper investigates the concept of behavioral autonomy in Artificial Life by drawing a parallel to the use of teleological notions in the study of biological life. Contrary to one of the leading assumptions in Artificial Life research, I argue that there is a significant difference in how autonomous behavior is understood in artificial and biological life forms: the former is underlain by human goals in a way that the latter is not. While behavioral traits (...) can be explained in relation to evolutionary history in biological organisms, in synthetic life forms behavior depends on a design driven by a research agenda, further shaped by broader human goals. This point will be illustrated with a case study on a synthetic life form. Consequently, the putative epistemic benefit of reaching a better understanding of behavioral autonomy in biological organisms by synthesizing artificial life forms is subject to doubt: the autonomy observed in such artificial organisms may be a mere projection of human agency. Further questions arise in relation to the need to spell out the relevant human aims when addressing potential social or ethical implications of synthesizing artificial life forms. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Traité des premières véritésby Claude G. BuffierJeffrey D. BursonClaude G. Buffier. Traité des premières vérités. Édition, présentation et notes par Louis Rouquayrol. Textes cartésiens en langue française. Paris: Librairie Philosophique J. Vrin, 2020. Pp. 379. Paperback, €32.00.Born in Poland to French parents, Claude G. Buffier, SJ (1661–1737) emerged as one of the most influential of the Parisian scriptores librorumin the first decades of the eighteenth century. Buffier is (...) perhaps best known as one of the founding editors of, and contributors to, the influential French Jesuit periodical Mémoires de Trévoux, but his works on general grammar, metaphysics, moral philosophy, and logic earned him widespread renown. His Grammaire françaiseachieved translation into Spanish, German, Italian, and English, and his Cours de sciences sur des principes nouveaux et simples pour former le langage, l'esprit, et le cœur dans l'usage ordinaire de la vie(1715) was widely adopted in France and Spain throughout the eighteenth century. Buffier's eclectic approach to philosophy, science, moral philosophy, and practical theology developed across several significant works: Principes du raisonnement(1714), Traité des premières vérités(1724), Éléments de métaphysique(1725), and Exposition des preuves les plus sensibles de la véritable religion(1732). In these works, Buffier was prescient in selectively adopting perspectives from Descartes, Malebranche, and Locke, evincing thereby his avid interest and participation in early Enlightenment discussions. Many of Buffier's texts proved to be influential on contributors to the Encyclopédie, on Voltaire, and perhaps later, as harbingers of Scottish Common Sense philosophy. Given the growing recognition of Buffier's importance thanks to the work of Kathleen Wilkins, Catherine Northeast, Jeffrey Burson, Katharine Hammerton, and others, Louis Rouquayrol's new critical edition of Buffier's most influential work, Traité des premières vérités( Treatise of First Truths) is most welcome. Rouquayrol's critical edition of the Traitéis replete with helpful [End Page 156]intertextual explanatory notes to the texts and debates that Buffier addressed, and it includes an insightful synthetic introduction, which summarizes the Traitéand addresses aspects of its philosophical and historical significance. The editor also helpfully includes a detailed chronology of Buffier's life and works, a note about the textual bases for the edition, several instructive appendices to later editions and related works by Buffier, and a profoundly helpful bibliography that includes existing editions, copies, and translations of the Traité, in addition to scholarly studies of Buffier's life and work. Rouquayrol's critical edition is, in short, the best one currently available, and it is likely to remain the standard published edition for some time.In the editor's view, Buffier's primary significance is as the inaugural eighteenth-century figure who attempted to redress the weaknesses at the heart of Cartesian "innate ideas" in ways that might have avoided Berkeley's or Malebranche's immaterialism or Hume's skepticism: "pour lutter contre les 'conséquences idéalistes du cartésianisme,'" Buffier "avait eu plutôt recours au sens commun comme à un 'complément nécessaire du sense intime, qui garantit l'existence du monde extérieur'" (13n2, quoting Étienne Gilson). This "solution mitigée" allowed for a certain reconciliation between Descartes and the "empirisme tempéré" of Locke, and more broadly, a way of moderating "les principes des Modernes" with "les poncifs des Anciens" (13). This conciliation of Lockean empiricism and certain strands of Cartesianism found in Buffier was in fact a central point made by my earlier work on Buffier's contribution to eighteenth-century Enlightenment Catholicism (see Rise and Fall of Theological Enlightenment[South Bend, IN: University of Notre Dame Press, 2010]; also "Claude G. Buffier and the Maturation of the Jesuit Synthesis in the Age of Enlightenment," Intellectual History Review21 [2011]: 449–72). Rouquayrol's effort to revisit the complexities of this conciliation in his introduction is a welcome development. He explicitly reminds us that while Jesuits such as Buffier were prohibited from teaching particular theses associated with Descartes after 1706, they were nevertheless increasingly influenced by aspects of Cartesianism (15–17). In many... (shrink)

What’s in a name after Derrida? What’s in a name after all? What is a name such that it always already remains, after all is said and done? And who or what is itthat one calls name, names, or by name? Is it possible (for anyone or anything) not to have a name of one’s own? Or to have another? The same as another? Is it possible to call and recall, in the name of memory and remembrance, indifference or convention, (...) one name for another, one name for the other? Can the name be, as it were, avoided? Could anyone respond responsibly yet decline or resist, not so much that (or because) names wound, nor to protect oneself from being called names, but instead neither to call nor respond to the name, as it were, to the very same name one is called? To protest against the name, to refuse the name to the point of abandoning this and that name? To invent oneself beyond the name, beyond all names, in the name of the name? “For in order to live oneself truly,” Derrida writes, “it is necessary to elude the law of the name, the familial law made for survival and constantly recalling me to death.” What is called naming? One could say that the name is, to life, at once insult and injury. Or that calling names—mourning. (shrink)

What are the foundations of human self-understanding and the value of responsible philosophical questioning? Focusing on Heidegger's early work on facticity, historicity, and the phenomenological hermeneutics of factical-historical life, Hans-Helmuth Gander develops an idea of understanding that reflects our connection with the world and other, and thus invites deep consideration of phenomenology, hermeneutics, and deconstruction. He draws usefully on Husserl's phenomenology and provides grounds for exchange with Descartes, Dilthey, Nietzsche, Gadamer, Ricoeur, and Foucault. On the way to developing a (...) contemporary hermeneutical philosophy, Gander clarifies the human relation to self in and through conversation with Heidegger's early hermeneutics. Questions about reading and writing then follow as these are the very actions that structure human self-understanding and world understanding. (shrink)

Similar to parasites, malignant cells exploit the host for energy, resources and protection, thereby impairing host health and fitness. Although cancer is widespread in the animal kingdom, its impact on life history traits and strategies have rarely been documented. Devil facial tumour disease, a transmissible cancer, afflicting Tasmanian devils, provides an ideal model system to monitor the impact of cancer on host life-history, and to elucidate the evolutionary arms-race between malignant cells and their hosts. Here (...) we provide an overview of parasite-induced host life history adaptations, then both phenotypic plasticity of LH responses and changes in allele frequencies that affect LH traits of Tasmanian devils in response to DFTD are discussed. We conclude that akin to parasites, cancer can directly and indirectly affect devil LH traits and trigger host evolutionary responses. Consequently, it is important to consider oncogenic processes as a selective force in wildlife. Exposure to transmissible cancer cells, i.e., Tasmanian devil facial tumour cells, can cause changes to life history traits either as the result of phenotypic plasticity in response to exposure during the lifetime of the individual or as the result of evolutionary change in LH traits due to selection over generations.Photo credits: Frédéric Thomas, Sarah Peck, Geordie Jennings. (shrink)

The Central Dogma of molecular biology, which holds that DNA makes protein and not the other way around, is as influential as it is controversial. Some believe the Dogma has outlived its usefulness, either because it fails to fully capture the ins-and-outs of protein synthesis (Griffiths and Stotz, 2013; Stotz, 2006), because it turns on a confused notion of information (Sarkar, 2004), or because it problematically assumes the unidirectional flow of information from DNA to protein (Gottlieb, 2001). This paper evaluates (...) an underexplored defense of the Dogma, which relies on the assumption that the Dogma and the Inheritance of Acquired Traits, a principle which dates as far back as Jean Baptiste-Lamarck, are incompatible principles (Smith, 1993; Judson, 1979; Dawkins, 1970; Cobb, 2017; Wilkins, 2002; Graur, 2018). By appealing to empirical evidence in molecular science, I argue that this apparent incompatibility is indeed merely apparent. I conclude by briefly demonstrating how these considerations bear on the topic of conceptual pluralism in the philosophy of science (Stencel and Proszewska, 2018; Lu and Bourrat, 2018). (shrink)

In this paper, I analyze the disruptive impact of Darwinian selectionism for the century-long tradition in which the environment had a direct causative role in shaping an organism’s traits. In the case of humans, the surrounding environment often determined not only the physical, but also the mental and moral features of individuals and whole populations. With its apparatus of indirect effects, random variations, and a much less harmonious view of nature and adaptation, Darwinian selectionism severed the deep imbrication of (...) organism and milieu posited by these traditional environmentalist models. This move had radical implications well beyond strictly biological debates. In my essay, I discuss the problematization of the moral idiom of environmentalism by William James and August Weismann who adopted a selectionist view of the development of mental faculties. These debates show the complex moral discourse associated with the environmentalist-selectionist dilemma. They also well illustrate how the moral reverberations of selectionism went well beyond the stereotyped associations with biological fatalism or passivity of the organism. Rereading them today may be helpful as a genealogical guide to the complex ethical quandaries unfolding in the current postgenomic scenario in which a revival of new environmentalist themes is taking place. (shrink)

There is surprisingly little philosophical work on conceptually spelling out the difference between the traits on which natural selection may be said to act (e.g. “having a high running speed”) and mere circumstantial traits (e.g. “happening to be in the path of a forest fire”). I label this issue the “selectable traits problem” and, in this paper, I propose a solution for it. I first show that, contrary to our first intuition, simply equating selectable traits with (...) heritable ones is not an adequate solution. I then go on to argue that two recent philosophical solutions to this problem—due to Peter Godfrey-Smith and Pierrick Bourrat—are unconvincing because they cannot accommodate frequency-dependent selection. The way out of this difficulty is, I argue, to accept that extrinsic properties dependent on relations between intrinsic properties of the population members should also count as selectable traits. I then show that my proposal is legitimized by more than the simple accommodation of frequency-dependent selection. (shrink)

Background: The literature has shown a significant association between traumatic experiences and eating psychopathology, showing a greater symptomatology in patients with trauma history. Less is known about the associations between trauma and cognitive schemas, and personality traits and the differences between childhood and adulthood trauma experiences. Thus, this paper aims to assess the clinical and psychological characteristics of eating disorder (ED) patients, looking for differences between patients without a history of trauma and patients with trauma experiences, as (...) well as at possible differences between exposure in childhood, adulthood, or repeated events. Another aim of the paper is to evaluate the possible mediation role of cognitive schemas and personality traits in the relationship between early trauma and eating psychopathology.Methods: From January to November 2020, 115 consecutive inpatients admitted for a specific multidisciplinary ED treatment in a dedicated Unit were evaluated for trauma, differentiating between trauma occurring in childhood and adulthood. The subjects were evaluated for early maladaptive schemas (EMS), personality traits, trauma symptomatology, quality of life, and specific psychopathologies linked to EDs. Mediation analyses between childhood and adulthood trauma and eating psychopathology were performed, with EMS and personality traits as mediators.Results: Patients with a history of trauma showed higher physical and psychological symptomatology scores, with a more impaired clinical profile in patients with both childhood and adulthood trauma exposure. The mediation analysis showed a specific mediator role for the “disconnection and rejection (DR)” EMS factor in the relationship between childhood trauma (cT) and eating psychopathology.Conclusion: Trauma experiences are associated with more severe clinical symptomatology in EDs and may need a specific assessment in patients with failed outpatient standard treatments. Specific cognitive schemas linked to DR domain should be evaluated in treatments for ED patients with history of trauma due to the mediation role between trauma and eating psychopathology. The need for outcome studies about treatment approaches for ED patients with history of trauma is discussed. (shrink)

Benenson et al. amass impressive evidence of robust sex differences as support for expanding “staying alive” theory. We argue for a broader and more domain-specific conceptualization focusing on life history tradeoffs between survival and mating success. Using three examples – women's disgust, fear of rape, and cultivation of bodyguards – we illustrate these tradeoffs and suggest a broader theoretical framework.

Although they cannot give absolute certification to moral judgment, the virtues provide a foundation for thought and action in real circumstances. Gouinlock begins his discussion by presenting some of the most fateful traits of existence, from which he proceeds to more specific analyses. He presents the problems of fact and value in a new and vivid light while giving moral discourse original and refreshingly constructive attention. In addition, there is penetrating analysis of the origins of moral values in the (...) conditions of the moral life. Drawing from research in the behavioral sciences, Gouinlock points out the multiple uses of knowledge of human nature in moral reflection and action. He then sets forth the nature of the virtues that are most suitable for contending with these generic conditions. Throughout, Gouinlock draws upon many sources of wisdom in the history of philosophy while laying bare the futilities of contemporary theories. (shrink)

What sets someone on a life trajectory? This question is at the heart of studies of 21st-century neurosciences that build on scientific models developed over the last 150 years that attempt to link psychopathology risk and human development. Historically, this research has documented persistent effects of singular, negative life experiences on people’s subsequent development. More recently, studies have documented neuromolecular effects of early life adversity on life trajectories, resulting in models that frame lives as disproportionately affected (...) by early negative experiences. This view is dominant, despite little evidence of the stability of the presumably early-developed molecular traits and their potential effects on phenotypes. We argue that in the context of gaps in knowledge and the need for scientists to reason across molecular and phenotypic scales, as well as time spans that can extend beyond an individual’s life, specific interpretative frameworks shape the ways in which individual scientific findings are assessed. In the process, scientific reasoning oscillates between understandings of cellular homeostasis and organisms’ homeorhesis, or life trajectory. Biologist and historian François Jacob described this framework as the “attitude” that researchers bring to bear on their “objects” of study. Through an analysis of, first, historical and contemporary scientific literature and then ethnographic research with neuroscientists, we consider how early life trauma came to be associated with specific psychological and neurobiological effects grounded in understandings of life trajectories. We conclude with a consideration of the conceptual, ontological, and ethical implications of interpreting life trajectories as the result of the persistence of long-embodied biological traits, persistent life environments, or both. (shrink)

All varieties of socialism share this trait in common: they are systematic alternatives to capitalism. But why should a systematic alternative to capitalism be necessary? Has it not proven to be the most productive economic system in history? Has it not created social conditions in which the powers of human imagination, creativity, and scientific understanding have grown to wider scope than in any previous society? Has it not enabled human beings to extend their life span and live healthier (...) and more active lives than ever before? Has it not proven extraordinarily plastic, able to solve unforeseen problems in ways that its opponents continue to predict that it cannot, thus proving itself superior to any proposed alternative? These are difficult questions that anyone who claims that an alternative is necessary must take seriously. (shrink)

In this book Frank Dumont presents personality psychology with a fresh description of its current status as well as its prospects. Play, sex, cuisine, creativity, altruism, pets, grieving rituals, and other oft-neglected topics broaden the scope of this fascinating study. This tract is imbued with historical perspectives that reveal the continuity in the evolving science and research of this discipline over the past century. The author places classic schemas and constructs, as well as current principles, in the context of their (...) socio-political catalysts. He further relates this study of the person to life-span developmental issues and to cultural, gender-specific, trait-based, genetic/epigenetic, and evolutionary research findings. Personality psychology has recently reconciled itself to more modest paradigms for describing, explaining, and predicting human behaviour than it generated in the 19th and 20th centuries. This book documents that transformation, providing valuable information for health-service professionals as well as to teachers, researchers, and scientists. (shrink)

Self-medication behaviour is the use of natural materials or chemical substances to manipulate behaviour or alter the body’s response to parasites or pathogens. Self-medication can be preventive, performed before an individual becomes infected or diseased, and/or therapeutic, performed after an individual becomes infected or diseased. We summarized all available reports of self-medication in mammals and reconstructed its evolution. We found that reports of self-medication were restricted to eutherian mammals and evolved at least four times independently. Self-medication was most commonly reported (...) in primates. Detailed analyses of primates suggest that self-medication is a life-history trait associated with body size, absolute brain size and longevity, but we found no support for the hypothesis that self-medication evolved to reduce the costs of social living. Large, longer-lived species might thus benefit uniquely from self-medication. (shrink)

Human life history incorporates childhood, a lengthy post-weaning period of dependency. This species-specific period provides an opportunity for extensive learning and for sophisticated cultural behaviors to develop, including crucial tool use skills. Although I agree that no individual cognitive trait singularly differentiates humans from other animals, I suggest here that without childhood, the traits that are key to human tool use would not emerge.

The fitness of any evolutionary unit can be understood in terms of its two basic components: fecundity (reproduction) and viability (survival). Trade-offs between these fitness components drive the evolution of life-history traits in extant multicellular organisms. We argue that these trade-offs gain special significance during the transition from unicellular to multicellular life. In particular, the evolution of germ–soma specialization and the emergence of individuality at the cell group (or organism) level are also consequences of trade-offs between (...) the two basic fitness components, or so we argue using a multilevel selection approach. During the origin of multicellularity, we study how the group trade-offs between viability and fecundity are initially determined by the cell level trade-offs, but as the transition proceeds, the fitness trade-offs at the group level depart from those at the cell level. We predict that these trade-offs begin with concave curvature in single-celled organisms but become increasingly convex as group size increases in multicellular organisms. We argue that the increasingly convex curvature of the trade-off function is driven by the cost of reproduction which increases as group size increases. We consider aspects of the biology of the volvocine green algae – which contain both unicellular and multicellular members – to illustrate the principles and conclusions discussed. (shrink)

While across the animal kingdom offspring are born smaller than their parents, notable exceptions exist. Several dipteran species belonging to the Hippoboscoidea superfamily can produce offspring larger than themselves. In this essay, the blood‐feeding tsetse is focused on. It is suggested that the extreme reproductive strategy of this fly is enabled by feeding solely on highly nutritious blood, and producing larval offspring that are soft and malleable. This immense reproductive expenditure may have evolved to avoid competition with other biting flies. (...) Tsetse also transmit blood‐borne parasites that cause the fatal diseases called African trypanosomiases. It is discussed how tsetse life history and reproductive strategy profoundly influence the type of vector control interventions used to reduce fly populations. In closing, it is argued that the unusual life history of tsetse warrants their preservation in the areas where human and animal health is not threatened. (shrink)

Life history theory in biology helps prompt the question: Does literature reflect the different phases of human life history equally? And if not, why not? i suggest that it does not. The centrality of sexual love and violent death in literature reflects the two key factors in biological evolution: reproduction and survival. But the very familiarity of these themes poses risks for storytellers. since nothing makes for more arresting unpredictability than conflicting motives in active opposition, stories (...) tend to focus disproportionately on conflicts of wills around love (mate choice and retention) and death (social oppositions and transgressions). Shakespeare’s The Winter’s Tale offers an illuminating example. (shrink)

The human history has evidenced various systems of hierarchy and power, various manifestations of power and hierarchy relations in different spheres of social life from politics to information networks, from culture to sexual life. A careful study of each particular case of such relations is very important, es-pecially within the context of contemporary multipolar and multicultural world. In the meantime it is very important to see both the general features typical for all or most of the hierarchy (...) and power forms, and their variation. This set of issues has been treated by a series of international conferences titled ‘Hierarchy and Power in the History of Civilizations’ held in 2000–2006. Most articles of this volume were originally presented at the 4th conference of this series (Moscow, 2006). Needless to mention that all those presentations have been substantially re-worked for the publication in this volume. The relations of hierarchy and power are relevant for all the spheres as they penetrate the whole of social life, establishing a sort of framework for the human agency. Cultural sphere is not an exclusion, although reflection of power relations in culture has its specific traits. First, within the cultural sphere power relations are usually informal, as they are more connected to traditions than to norms. Second, in cultural sphere there are less power institutions which have legal right to the coercion. (shrink)

Intuitive theories are sets of integrated concepts and causal laws that people adopt to comprehend, explain, and predict certain phenomena they encounter in the world. These theories are ‘intuitive’ because they are thought to drive our intuitions about how the physical and biological world, the mental life of people, and the society we live in work, without meeting the standards of explicit scientific theorizing. The proposal that people adopt such theories has been around at least since the 1970s. However, (...) how psychologists think about intuitive theories has been changing since they have been first proposed. In this chapter, we provide a short overview of the approaches to the function of intuitive theories and belief-forming systems more generally. While early characterization of intuitive theories emphasized their epistemic function, later attempts took an evolutionary view, claiming that they serve adaptive functions that are not always aligned with the goal of accurately tracking environmental states. A recent twist in this story is the proposal that shared intuitive theories may also serve social functions by providing a ‘theoretical common ground’ on which people interpret unobservable entities, such as memories, character traits, entitlements, and obligations. Such shared theories might be essential for social coordination via communication. (shrink)

This article introduces a new model of the relationship between growth and learning and tests a set of hypotheses related to the development of adult competency using time allocation, anthropometric, and experimental task performance data collected between 1992 and 1997 in a multiethnic community in the Okavango Delta, Botswana. Building on seminal work in life history theory by Hawkes, Blurton Jones and associates, and Kaplan and associates, the punctuated development model presented here incorporates the effects of both growth (...) and learning constraints on age-specific task performance. In addition, the payoff to investment in two forms of embodied capital, growth-based and learning-based, are examined in relation to features of the socioecology, including subsistence economy and family composition.The three main findings are:The development of adult competency in specific tasks entails a steplike relationship between growth- and experience-based forms of embodied capital in the ontogeny of ability acquisition.There is a trade-off between the acquisition of experience-based embodied capital in the form of skills and knowledge and immediate productivity among children. Time allocation to these alternatives is primarily determined by the short- and long-term costs and benefits to parents of investment in children’s embodied capital.The availability of laborers and the overall labor requirements of the household are major determinants of investment in alternate forms of embodied capital and resulting variation in children’s time allocation. The value of children’s labor to their parents is dependent upon the opportunity costs to engaging in other activities not only for the child in question but also for potential substitute laborers.These results have important implications for our understanding of the role of growth and learning in the evolution of the human juvenile period, as well as for our understanding of cross-cultural variation in child growth and development and patterns of work and play. (shrink)

Following from life history and attachment theory, individuals are predicted to be sensitive to variation in environmental conditions such that risk and uncertainty are internalized by cognitive, affective, and psychobiological mechanisms. In turn, internalizing of environmental uncertainty is expected to be associated with attitudes toward risk behaviors and investments in education. Native American youth aged 10–19 years (n = 89) from reservation communities participated in a study examining this pathway. Measures included family environmental risk and uncertainty, present and (...) future time perspective, adolescent attachment, attitudes toward risk, investments in education, and salivary cortisol. Results support the idea that environmental risk and uncertainty are internalized during development. In addition, internalizing mechanisms significantly predicted attitudes toward risk and education: (1) lower scores on future time perspective and higher cortisol predicted higher scores on risk attitudes, and (2) higher scores on future time perspective and lower scores on problems with attachment predicted higher self-reported school performance. Gender differences were seen, with males anticipating a shorter lifespan than females, which predicted higher scores on risk attitudes and lower school performance. Implications for research on adolescent problem behavior and academic achievement are discussed. (shrink)

Adolescence signifies a transition from the use of prereproductive to reproductive strategies in the life history of Homo sapiens. Insofar as human generations overlap, events at adolescence, surrounding the onset of puberty, offer a unique glimpse into human adaptation from the point of view of the changing strategies of both parents and offspring. The timing of puberty is an important life history trait that varies between species, but also between and within the sexes in human beings. (...) The onset of puberty marks the beginning of the reproductive life, is affected by previous experience, and serves as a trigger for behavioral change. Surbey (1988, 1990) reported relationships between father absence, heightened levels of childhood stress, and early menarche and considered them within the context of human evolutionary history. Subsequently, similar findings have been reported in a number of human populations and have been interpreted from several evolutionary perspectives. This article discusses the extent to which these and related findings regarding alterations in the timing of human puberty reflect evolved parental or offspring strategies. It entails a consideration of the applicability of the concepts of phenotypic plasticity, nonadaptive genetic variation, and conditional and alternative reproductive strategies in describing the interwoven nature of strategies employed by parent and child in the transition at adolescence. (shrink)

In many species the mutation rate is higher in males than in females, a phenomenon denoted as male mutation bias. This is often observed in animals where males produce many more sperm than females produce eggs, and is thought to result from differences in the number of replication‐associated mutations accumulated in each sex. Thus, studies of male mutation bias have the capacity to reveal information about the replication‐dependent or replication‐independent nature of different mutations. The availability of whole genome sequences for (...) many species, as well as for multiple individuals within a species, has opened the door to studying factors, both sequence‐specific and those acting on the genome globally, that affect differences in mutation rates between males and females. Here, we assess the advantages that genomic sequences provide for studies of male mutation bias and general mutation mechanisms, discuss major challenges left unresolved, and speculate about the direction of future studies. (shrink)

The current paper synthesizes theory and data from the field of life history (LH) evolution to advance a new developmental theory of variation in human LH strategies. The theory posits that clusters of correlated LH traits (e.g., timing of puberty, age at sexual debut and first birth, parental investment strategies) lie on a slow-to-fast continuum; that harshness (externally caused levels of morbidity-mortality) and unpredictability (spatial-temporal variation in harshness) are the most fundamental environmental influences on the evolution and (...) development of LH strategies; and that these influences depend on population densities and related levels of intraspecific competition and resource scarcity, on age schedules of mortality, on the sensitivity of morbidity-mortality to the organism’s resource-allocation decisions, and on the extent to which environmental fluctuations affect individuals versus populations over short versus long timescales. These interrelated factors operate at evolutionary and developmental levels and should be distinguished because they exert distinctive effects on LH traits and are hierarchically operative in terms of primacy of influence. Although converging lines of evidence support core assumptions of the theory, many questions remain unanswered. This review demonstrates the value of applying a multilevel evolutionary-developmental approach to the analysis of a central feature of human phenotypic variation: LH strategy. (shrink)

Aspects of human life history and cognition, such as our long childhoods and extensive use of teaching, theoretically evolved to facilitate the acquisition of complex tasks. The present paper empirically examines the relationship between subsistence task difficulty and age of acquisition, rates of teaching, and rates of oblique transmission among Hadza and BaYaka foragers from Tanzania and the Republic of Congo. We further examine cross-cultural variation in how and from whom learning occurred. Learning patterns and community perceptions of (...) task difficulty were assessed through interviews. We found no relationship between task difficulty, age of acquisition, and oblique transmission, and a weak but positive relationship between task difficulty and rates of teaching. While same-sex transmission was normative in both societies, tasks ranked as more difficult were more likely to be transmitted by men among the BaYaka, but not among the Hadza, potentially reflecting cross-cultural differences in the sexual division of subsistence and teaching labor. Further, the BaYaka were more likely to report learning via teaching, and less likely to report learning via observation, than the Hadza, possibly owing to differences in socialization practices. (shrink)

Life-history evolution is a complexprocess. Life-history theory covers the fundamentallevel of the process, the evolution of life-historytraits. Life-history traits interact; thosecoevolving as a response to the same selectionpressure form life-history tactics. Top level of thehierarchy, life-history strategy, is formed bygenetically interconnected tactics. Our aim is toexpand the traditional view to life-history evolutionby considering what boundary conditions a successfullife-history strategy has to fulfil. We claim thatthe most (...) fundamental condition successful strategieshave to meet is to minimize the risk of evolutionaryfailure. Here the risk of failure refers to failurein transferring practitioners of the strategy to thenext time point, either through survival, or byreproduction. We make an attempt to classify types ofrisks as they lead to evolutionary failure, anddiscuss how risk minimization ideas may be approachedempirically. We conclude that understanding howtraits evolve may not cover all aspects of howstrategies evolve. We emphasize that bookkeeping ofthe actual causes of failure might help in developinglife-history theory that uses causes of selection topredict responses to selection. (shrink)