Many philosophers of science and methodologists have argued that the ability to repeat studies and obtain similar results is an essential component of science. A finding is elevated from single observation to scientific evidence when the procedures that were used to obtain it can be reproduced and the finding itself can be replicated. Recent replication attempts show that some high profile results – most notably in psychology, but in many other disciplines as well – cannot be replicated consistently. These replication (...) attempts have generated a considerable amount of controversy, and the issue of whether direct replications have value has, in particular, proven to be contentious. However, much of this discussion has occurred in published commentaries and social media outlets, resulting in a fragmented discourse. To address the need for an integrative summary, we review various types of replication studies and then discuss the most commonly voiced concerns about direct replication. We provide detailed responses to these concerns and consider different statistical ways to evaluate replications. We conclude there are no theoretical or statistical obstacles to making direct replication a routine aspect of psychological science. (shrink)

The Drosophila embryo provides a useful model system to study the mechanisms that lead to pattern and cell diversity in the central nervous system (CNS). The Drosophila CNS, which encompasses the brain and the ventral nerve cord, develops from a bilaterally symmetrical neuroectoderm, which gives rise to neural stem cells, called neuroblasts. The structure of the embryonic ventral nerve cord is relatively simple, consisting of a sequence of repeated segmental units (neuromeres), and the mechanisms controlling the formation and specification of (...) the neuroblasts that form these neuromeres are quite well understood. Owing to the much higher complexity and hidden segmental organization of the brain, our understanding of its development is still rudimentary. Recent investigations on the expression and function of proneural genes, segmentation genes, dorsoventral‐patterning genes and a number of other genes have provided new insight into the principles of neuroblast formation and patterning during embryonic development of the fly brain. Comparisons with the same processes in the trunk help us to understand what makes the brain different from the ventral nerve cord. Several parallels in early brain patterning between the fly and the vertebrate systems have become evident. BioEssays 26:739–751, 2004. © 2004 Wiley Periodicals, Inc. (shrink)

Name der Zeitschrift: Jahrbuch für Wissenschaft und Ethik Jahrgang: 22 Heft: 1 Seiten: 65-86.

Current theories assume that perception and affect are separate realms of the mind. In contrast, we argue that affect is a genuine online-component of perception instantaneously mirroring the success of different perceptual stages. Consequently, we predicted that the success (failure) of even very early and cognitively encapsulated basic visual Processing steps would trigger immediate positive (negative) affective responses. To test this assumption, simple visual stimuli that either allowed or obstructed early visual processing stages without participants being aware of this were (...) presented briefly. Across 5 experiments, we found more positive affective responses to stimuli that allowed rather than obstructed Gestalt completion at certain early visual stages (Experiments 1–3; briefest presentation 100 ms with post-mask), and visual disambiguation in possible vs. impossible Necker cubes (Experiments 4 and 5; briefest presentation 100 ms with post-mask). This effect was observed both on verbal preference ratings (Experiments 1, 2, and 4) and as facial muscle responses occurring within 2–4 s after stimulus onset (zygomaticus activity; Experiments 3 and 7). For instance, in participants unaware of spatial possibility we found affective discrimination between possible and impossible Necker cubes (the famous Freemish Crate) for 100 ms presentation timings, although a conscious discrimination took more than 2000 ms (Experiment 4). (shrink)

In this article, we hypothesize that leaders who display group-oriented values (i.e., values that focus on the welfare of the group rather than on the self-interest of the leader) will be evaluated more positively by their followers than leaders who do not display group-oriented values. Importantly, we expected these effects to be more pronounced for leaders who are ingroup members (i.e., stemming from the same social group as their followers) than for leaders who are outgroup members (i.e., leaders stemming from (...) a different social group than their followers). We tested our hypotheses in two studies. Results of a field study (N = 95) showed the expected relationship between leaders’ group-oriented values and followers’ identification with their leaders. A scenario study (N = 137) replicated the results and extended it to followers’ endorsement of their leaders. Overall, these findings suggest that displaying group-oriented values pays off more for ingroup than for outgroup leaders. (shrink)

Population counts and longitude and latitude coordinates were estimated for the 50 largest cities in the United States by computational linguistic techniques and by human participants. The mathematical technique Latent Semantic Analysis applied to newspaper texts produced similarity ratings between the 50 cities that allowed for a multidimensional scaling (MDS) of these cities. MDS coordinates correlated with the actual longitude and latitude of these cities, showing that cities that are located together share similar semantic contexts. This finding was replicated using (...) a first‐order co‐occurrence algorithm. The computational estimates of geographical location as well as population were akin to human estimates. These findings show that language encodes geographical information that language users in turn may use in their understanding of language and the world. (shrink)

The current research investigates a combination of two instructional approaches, tutored problem solving and worked examples. Tutored problem solving with automated tutors has proven to be an effective instructional method. Worked‐out examples have been shown to be an effective complement to untutored problem solving, but it is largely unknown whether they are an effective complement to tutored problem solving. Further, while computer‐based learning environments offer the possibility of adaptively transitioning from examples to problems while tailoring to an individual learner, the (...) effectiveness of such machine‐adapted example fading is largely unstudied. To address these research questions, one lab and one classroom experiment were conducted. Both studies compared a standard Cognitive Tutor with two example‐enhanced Cognitive Tutors, in which the fading of worked‐out examples occurred either in a fixed way or adaptively. Results indicate that the adaptive fading of worked‐out examples leads to higher transfer performance on delayed posttests than the other two methods. (shrink)

While evenness is understood to be maximal if all types (species, genotypes, alleles, etc.) are represented equally (via abundance, biomass, area, etc.), its opposite, maximal unevenness, either remains conceptually in the dark or is conceived as the type distribution that minimizes the applied evenness index. The latter approach, however, frequently leads to conceptual inconsistency due to the fact that the minimizing distribution is not specifiable or is monomorphic. The state of monomorphism, however, is indeterminate in terms of its evenness/unevenness characteristics. (...) Indeed, the semantic indeterminacy also shows up in the observation that monomorphism represents a state of pronounced discontinuity for the established evenness indices. This serious conceptual inconsistency is latent in the widely held idea that evenness is an independent component of diversity. As a consequence, the established evenness indices largely appear as indicators of relative polymorphism rather than as indicators of evenness. In order to arrive at consistent measures of evenness/unevenness, it seems indispensable to determine which states are of maximal unevenness and then to assess the position of a given type distribution between states of maximal evenness and maximal unevenness. Since semantically, unevenness implies inequality among type representations, its maximum is reached if all type representations are equally different. For given number of types, this situation is realized if type representations, when ranked in descending order, show equal differences between adjacent types. We term such distributions “stepladders” as opposed to “plateaus” for uniform distributions. Two approaches to new evenness measures are proposed that reflect different perspectives on the positioning of type distributions between the closest stepladders and the closest plateaus. Their two extremes indicate states of complete evenness and complete unevenness, and the midpoint is postulated to represent the turning point between prevailing evenness and prevailing unevenness. The measures are graphically illustrated by evenness surfaces plotted above frequency simplices for three types, and by transects through evenness surfaces for more types. The approach can be generalized to include variable differences between types (as required in analyses of functional evenness) by simply replacing types with pairs of different types. Pairs, as the new types, can be represented by their abundances, for example, and these can be modified in various ways by the differences between the two types that form the pair. Pair representations thus consist of both the difference between the paired types and their frequency. Omission of pair frequencies leads to conceptual ambiguity. Given this specification of pair representations, their evenness/unevenness can be evaluated using the same indices developed for simple types. Pair evenness then turns out to quantify dispersion evenness. (shrink)

In this article, we hypothesize that leaders who display group-oriented values (i.e., values that focus on the welfare of the group rather than on the self-interest of the leader) will be evaluated more positively by their followers than leaders who do not display group-oriented values. Importantly, we expected these effects to be more pronounced for leaders who are ingroup members (i.e., stemming from the same social group as their followers) than for leaders who are outgroup members (i.e., leaders stemming from (...) a different social group than their followers). We tested our hypotheses in two studies. Results of a field study ( N = 95) showed the expected relationship between leaders’ group-oriented values and followers’ identification with their leaders. A scenario study ( N = 137) replicated the results and extended it to followers’ endorsement of their leaders. Overall, these findings suggest that displaying group-oriented values pays off more for ingroup than for outgroup leaders. (shrink)

Although leadership of organizations rarely is discussed in terms of the religious construct of repentance, we propose that repentance and continuous improvement are closely related ideas that profoundly impact individuals and organizations. We identify six parallels between repentance and continuous improvement and then show how these parallels apply to the fundamental principles associated with highly regarded leadership perspectives. We conclude by identifying five contributions of the article to the management literature.

Traditionally, conceptualizations of human values are based on the assumption that individuals possess a single integrated value system comprising those values that people are attracted by and strive for. Recently, however, van Quaquebeke et al. (in J Bus Ethics 93:293–305, 2010 ) proposed that a value system might consist of two largely independent value orientations—an orientation of ideal values and an orientation of counter-ideal values (values that individuals are repelled by), and that both orientations exhibit antithetic effects on people’s responses (...) to the social world. Following a call for further research on this distinction, we conducted two studies to assess the independent effects of ideal and counter-ideal values in leadership settings. Study 1 ( N = 131) finds both value orientations to explain unique variance in followers’ vertical respect for their leaders. Study 2 ( N = 136) confirms these results and additionally shows an analogous effect for followers’ identification with their leaders. Most importantly, we find that both value orientations exhibit their effects only independently when the content of the two orientations pertain to different value types in Schwartz’s (in J Soc Issues 50:19–46, 1994 ) circumplex model. Implications for theory and practice are discussed. (shrink)

The question 'Why should I obey the law?' introduces a contemporary puzzle that is as old as philosophy itself. The puzzle is especially troublesome if we think of cases in which breaking the law is not otherwise wrongful, and in which the chances of getting caught are negligible. Philosophers from Socrates to H.L.A. Hart have struggled to give reasoned support to the idea that we do have a general moral duty to obey the law but, more recently, the greater number (...) of learned voices has expressed doubt that there is any such duty, at least as traditionally conceived. (shrink)

Throughout the biological and biomedical sciences there is a growing need for, prescriptive ‘minimum information’ (MI) checklists specifying the key information to include when reporting experimental results are beginning to find favor with experimentalists, analysts, publishers and funders alike. Such checklists aim to ensure that methods, data, analyses and results are described to a level sufficient to support the unambiguous interpretation, sophisticated search, reanalysis and experimental corroboration and reuse of data sets, facilitating the extraction of maximum value from data sets (...) them. However, such ‘minimum information’ MI checklists are usually developed independently by groups working within representatives of particular biologically- or technologically-delineated domains. Consequently, an overview of the full range of checklists can be difficult to establish without intensive searching, and even tracking thetheir individual evolution of single checklists may be a non-trivial exercise. Checklists are also inevitably partially redundant when measured one against another, and where they overlap is far from straightforward. Furthermore, conflicts in scope and arbitrary decisions on wording and sub-structuring make integration difficult. This presents inhibit their use in combination. Overall, these issues present significant difficulties for the users of checklists, especially those in areas such as systems biology, who routinely combine information from multiple biological domains and technology platforms. To address all of the above, we present MIBBI (Minimum Information for Biological and Biomedical Investigations); a web-based communal resource for such checklists, designed to act as a ‘one-stop shop’ for those exploring the range of extant checklist projects, and to foster collaborative, integrative development and ultimately promote gradual integration of checklists. (shrink)

R. Kühn rappelle dans cette étude quelques principes sur les prérequis phénoménologiques de l’analyse spécifique du Prologue de Jean, lu au prisme d’une méditation attentive de Maître Eckhart. Il est évident que M. Henry se situe parmi les grands interprètes de ce texte qui influença les plus hautes spéculations en philosophie de la religion. Dans l’étude de cette profonde affinité entre M. Henry et l’Évangile de Jean, R. Kühn met en évidence l’analyse phénoménologique de la liaison entre l’homme et Dieu, (...) pensée dans le cadre d’une éthique et d’une théorie de la vérité affective. Si M. Henry peut ainsi préciser le geste de l’épochè de toute généalogie mondaine, en posant le premier Fils de Dieu au « commencement », et ceci en un rapport d’irréversibilité, il apparaît qu’il pense ainsi davantage la rupture du geste transcendantal que sa différence ou sa distance, puisque la naissance et la vie sont en deçà du monde et dans « l’intériorité de l’expérience transcendantale ». (shrink)

Husserl's phenomenology abandoned the fundamental phenomenological task of investigating pure appearance in favour of research into transcendent knowledge of essences. Thereby, in place of the original cogitano with its capacity for self-giving, the intentional intuition came to present itself as a mode of givenness without a radical phenomenalization of the ontologically pre-given. M. Henry, who already elaborated a „material phenomenology“ of the original hyletic self-affection as immanence of life, has demonstrated the deficiency of the phenomenological differentiation of appearing from appearance (...) by invoking four principles of phenomenology. These concern the relation between being /appearing, intuition /evidence, method /things in themselves, and reduction /givenness. Regarding this last connection J.-L. Marion's recent phenomenological approach is also worth taking into account. With the „pure appeal“, Marion at the same time questions Heidegger's priority of Dasein on behalf of the Ego. (shrink)

v. 1. A-D -- v. 2. E-L -- v. 3. M-Z -- v. 4. Verzeichnisse.

A. Kenny, Frege, an introduction to the founder of modern analytic philosophy. London:Penguin, 1995. viii-h223pp. £7.99 T. Willamson, Vagueness. London:Routledge, 1994. xiii-f-325 pp. £35.00 TOM BU...

Universalism vs. Communitarianism focuses on the question, raised by recent work in normative philosophy, of whether ethical norms are best derived and justified on the basis of universal or communitarian standards. It is unique in representing both Continental and American points of view and both the older and a younger generation of scholars. The essays introduce the key issues involved in universalism vs. communitarianism and take up ethics in historical perspective, practical reason and ethical responsibility, justification, application and history, and (...) communitarian alternatives. Based on a special issue of the Journal Philosophy and Social Criticism, the book includes two additional essays by Chantal Mouffe and by Hubert and Stuart Dreyfus. David Rasmussen is Professor of Philosophy at Boston College and editor of Philosophy and Social Criticism. Contents: introduction, David, Rasmussen. Universalisms: Procedural, Contextualist, and Prudential, Alessandro Ferrara. Beyond Liberalism and Communitarianism: Toward a Critical Theory of Social Justice, Gerald Doppelt. The Liberal/Communitarian Controversy and Communicative Ethics, Kenneth Baynes. Discourse Ethics and Civil Society, Jean Cohen. Equality, Political Order and Ethics: Hobbes and the Systematics of Democratic Rationality, Rolf Zimmermann. Atomism and Ethical Life: On Hegel's Critique of the French Revolution, Axel Honneth. The Gadamer-Habermas Debate Revisited: The Question of Ethics, Michael Kelly. What Is and What Is Not Practical Reason? Agnes Heller. Adorno, Heidegger, and Postmodernity, Hauke Brunkhorst. Impartial Application of Moral and Legal Norms: A Contribution to Discourse Ethics, Klaus Günther. An Ethics, Politics, and History, Jürgen Habermas in an interview conducted by Jean-Marc Ferry. Rawls: Political Philosophy without Politics, Chantal Mouffe. What Is Morality: A Phenomenological Account of the Development of Ethical Expertise, Hubert L Dreyfus, Stuart E. Dreyfus. Universalism and Communitarianism: A Bibliography, Michael Zilles. (shrink)

Recent history makes clear that the quantum leaps being made in technology are the leading edge of a groundswell of paradigm shifts taking place in science, politics, economics, social institutions, and the expression of cultural values. Indeed it is the simultaneity and interdependence of these changes occurring in every dimension of human experience and endeavor that makes the present so historically distinctive. The essays gathered here give voice to perspectives on the always improvised relationship between technology and cultural values from (...) Africa, the Americas, Asia, Australia, Europe, and the Pacific. Contributors: Syed Muhammad Naquib Al-Attas, Roger T. Ames,Yoko Arisaka, Carl Becker, Francesca Bray, James Buchanan, Arindam Chakrabarti, Frank W. Derringh, Rolf Elberfeld, Charles Ess, Andrew Feenberg, Susantha Goonatilake, H. Jiuan Heng, Peter Hershock, Thomas P. Kasulis, George Khushf, David Farrell Krell, Joel J. Kupperman, William R. LaFleur, Lois Ann Lorentzen, David Loy, Joseph Margolis, Hans-Georg Möller, Robert Cummings Neville, Peimin Ni, Monica Atieno Opole, Kuruvilla Pandikattu SJ, Helen Petrovsky, Ramon Sentmartí, Kristin Shrader-Frechette, Vasanthi Srinivasan, Marietta Stepaniants, Vyacheslav S. Stiopin, Henk ten Have, Paul B.Thompson, Mary Tiles, David B.Wong. (shrink)

Book reviewed in this article: The Philosophical Assessment of Theology: Essays in Honour of Frederick C. Copleston. Edited by Gerard J. Hughes. Language, Meaning and God: Essays in Honour of Herbert McCabe OP. Edited by Brian Davies. God Matters. By Herbert McCabe. Philosophies of History: A Critical Essay. By Rolf Gruner. The ‘Phaedo’: A Platonic Labyrinth. By Ronna Burger. Lessing's ‘Ugly Ditch’: A Study of Theology and History. By Gordon E. Michalson, Jr. Peirce. By Christopher Hookway. Frege: Tradition and Influence. (...) Edited by Crispin Wright. The Private World. Selections from the Diario Íntimo and Selected Letters 1890–1936. By Miguel de Unamuno, translated by Anthony Kerrigan, Allen Lacy, Martin Nozick. A Third Collection: Papers by Bernard J.F. Lonergan, S.J. Edited by Frederick E. Crowe. Philosophical Papers. By Charles Taylor. 2 vols. Principles of Language and the Mind. By T.P. Waldron. The Principle of Double Effect: A Critical Appraisal of its Traditional Understanding and its Modern Reinterpretation. By L.I. Ugorji. Human Rights: Fact or Fancy By Henry B. Veatch. Enlightenment and Alienation: An Essay towards a Trinitarian Theology. By Colin Gunton. Only Human. By Don Cupitt. The Roots of the Modern Christian Tradition. Edited by E. Rpzanne Elder. ‘Africanische Theologie’: Darstellung und Dialog.. By Heribert Rücker. African Religions in Western Conceptual Schemes. By Emefie Ikenga Metuh. The Destiny of Man: Dagaare Beliefs in Dialogue with Christian Eschatology. By Edward Kuukure. The World in Between: Christian Healing and the Struggle for Spiritual Survival. By E. Milingo. Theology in Africa. By Kwesi A. Dickson. The Future of Anglican Theology. Edited by M. Darrol Bryant. Reconciling. By John Coventry. The Genesis of Faith: The Depth Theology of Abraham Joshua Heschel. By John C. Merkle. Anthropology in Theological Perspective. By Wolfhart Pannenberg. Contemporary Approaches to the Study of Religion. Volume II: The Social Sciences. Edited by Frank Whaling. American Sociology: Worldly Rejections of Religion and Their Directions. By Arthur J. Vidich and Stanford M. Lyman. A Critical Theory of Religion: The Frankfurt School. By Rudolf J. Siebert. The Anthropology of Evil. Edited by David Parkin. The Wealth of Christians. By Redmond Mullin. Biblical Interpretation in Ancient Israel. By Michael Fishbane. Reading the Old Testament: An Introduction. By Lawrence Boadt. Old Testament Theology: Its History and Development. By John H. Hayes and Frederick C. Prussner. God's Conflict with the Dragon and the Sea: Echoes of a Canaanite Myth in the Old Testament. By John Day. Law and Wisdom from Ben Sira to Paul. By Eckhard J. Schnabel. The Order of the Synoptics: Why Three Synoptic Gospels? By Bernard Orchard and Harold Riley. The Making of Mark. By J. Duncan M. Derrett. Argumentation bei Paulus. By Folker Siegert. Christians and the Military: The Early Experience. Edited by Robert J. Daly. Origienes' Eucharistielehre im Streit der Konfessionen; Die Auslegungsgeschichte seit der Reformation. By Lothar Lies. L'église de Cappadoce au IVe siècle d'après la correspondance de Basile de Césarée. By Benpit Gain Cave Monasteries of Byzantine Cappadocia. By Lyn Rodley. Augustine of Hippo, Selected Writings. Translated with an Introduction by Mary T. Clark. Wisdom from St Augustine. By Vernon J. Bourke. A History of Religious Ideas, Vol. 3: From Muhammad to the Age of Reforms. By Mircea Eliade. Les Lectionnaires Copies Annuels: Basse‐Egypte. By Ugo Zanetti. Humanism and Scholasticism in Late Medieval Germany. By James H. Overfield. Wyclif. By Anthony Kenny. The Lady and the Virgin: Image, Attitude and Experience in Twelfth Century France. By Penny Shine Gold. Unquiet Souls: Fourteenth‐Century Saints and Their Religious Milieu. By Richard Kieckhefer. Luther: Theologian for Catholics and Protestants. Edited by George Yule. La Réforme Catholique: Le Combat de Maldonat. By Paul Schmitt. Roman Catholicism in England: From the Elizabethan Settlement to the Second Vatican Council. By Edward Norman. The Life of David Brainerd. Edited by Norman Pettit. Nineteenth Century Religious Thought in the West. Edited by Ninian Smart, John Clayton, Patrick Sherry and Steven T. Katz The Significance of Jesus Christ in Asia. By Hans Staffner. Is the Virgin Mary Appearing at Medjugorje? By René Laurentin and Ljudevit Rupčić. Mary Queen of Peace: Is the Mother of God Appearing in Medjugorje? By Lucy Rooney and Robert Fancy. (shrink)

Two decades ago, Rolf Landauer (1991) argued that “information is physical” and ought to have a role in the scientific analysis of reality comparable to that of matter, energy, space and time. This would also help to bridge the gap between biology and mathematics and physics. Although it can be argued that we are living in the ‘golden age’ of biology, both because of the great challenges posed by medicine and the environment and the significant advances that have been made—especially (...) in genetics and molecular and cell biology—we feel that information as an essential aspect of life has been neglected, or at least misunderstood. We therefore summon Maxwell’s Demon and its distant relative the ratchet, and apply these to biology. (shrink)

In this book, Sarah Rolfe Prodan examines the spiritual poetry of Michelangelo in light of three contexts: the Catholic Reformation movement, Renaissance Augustinianism, and the tradition of Italian religious devotion. Prodan combines a literary, historical, and biographical approach to analyze the mystical constructs and conceits in Michelangelo's poems, thereby deepening our understanding of the artist's spiritual life in the context of Catholic Reform in the mid-sixteenth century. Prodan also demonstrates how Michelangelo's poetry is part of an Augustinian tradition that (...) emphasizes mystical and moral evolution of the self. Examining such elements of early modern devotion as prayer, lauda singing, and the contemplation of religious images, Prodan provides a unique perspective on the subtleties of Michelangelo's approach to life and to art. Throughout, Prodan argues that Michelangelo's art can be more deeply understood when considered together with his poetry, which points to a spirituality that deeply informed all of his production. (shrink)

This book deals with a topic that has been largely neglected by philosophers of science to date: the ability to refer and analyze in tandem. On the basis of a set of philosophical case studies involving both problems in number theory and issues concerning time and cosmology from the era of Galileo, Newton and Leibniz up through the present day, the author argues that scientific knowledge is a combination of accurate reference and analytical interpretation. In order to think well, we (...) must be able to refer successfully, so that we can show publicly and clearly what we are talking about. And we must be able to analyze well, that is, to discover productive and explanatory conditions of intelligibility for the things we are thinking about. The book’s central claim is that the kinds of representations that make successful reference possible and those that make successful analysis possible are not the same, so that significant scientific and mathematical work typically proceeds by means of a heterogeneous discourse that juxtaposes and often superimposes a variety of kinds of representation, including formal and natural languages as well as more iconic modes. It demonstrates the virtues and necessity of heterogeneity in historically central reasoning, thus filling an important gap in the literature and fostering a new, timely discussion on the epistemology of science and mathematics. (shrink)

In this article I engage with the notion that Christ ought to be understood to have a fallen human nature because Christ sanctifies human nature, and it is fallen humanity that needs sanctifying. In opposition to this line of thought, I argue that the Son of God assumed an unfallen nature, but with the powers of fallenness operative within it, and that this notion is consistent with a distinct account of sanctification. In support of these claims, I develop distinctions between (...) a conjoining union and a transferring union, and between the Chalcedonian union at the incarnation and the extension of that union on the cross. At the assumption a conjoining union occurred, not a transferring union. Christ sanctified his own nature, prior to a transferring union. (shrink)

This book develops and empirically tests a social theory of political participation. It overturns prior understandings of why some people vote more often than others. The book shows that the standard demographic variables are not proxies for variation in the individual costs and benefits of participation, but for systematic variation in the patterns of social ties between potential voters. Potential voters who move in larger social circles, particularly those including politicians and other mobilizing actors, have more access to the flurry (...) of electoral activity prodding citizens to vote and increasing political discussion. Treating voting as a socially defined practice instead of as an individual choice over personal payoffs, a social theory of participation is derived from a mathematical model with behavioral foundations that is empirically calibrated and tested using multiple methods and data sources. (shrink)