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The Maynard Smith Model of Sympatric Speciation
ARTICLE IN PRESS Journal of Theoretical Biology 239 (2006) 172–182 www.elsevier.com/locate/yjtbi The Maynard Smith model of sympatric speciation Sergey Gavriletsa,b,Ã aDepartment of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA bDepartment of Mathematics, University of Tennessee, Knoxville, TN 37996, USA Received 4 March 2005; received in revised form 23 July 2005; accepted 24 July 2005 Available online 20 October 2005 Abstract The paper entitled ‘‘Sympatric speciation,’’ which was published by John Maynard Smith in 1966, initiated the development of mathematical models aiming to identify the conditions for sympatric speciation. A part of that paper was devoted to a specific two-locus, two-allele model of sympatric speciation in a population occupying a two-niche system. Maynard Smith provided some initial numerical results on this model. Later, Dickinson and Antonovics (1973) and Caisse and Antonovics (1978) performed more extensive numerical studies on the model. Here, I report analytical results on the haploid version of the Maynard Smith model. I show how the conditions for sympatric and parapatric speciation and the levels of resulting genetic divergence and reproductive isolation are affected by the strength of disruptive selection and nonrandom mating, recombination rate, and the rates of male and female dispersal between the niches. r 2005 Elsevier Ltd. All rights reserved. Keywords: Sympatric; Speciation; Mathematical model; Maynard Smith 1. Introduction ‘‘Animal speciation and evolution’’ which forcefully argued against the importance of sympatric speciation in nature. John Maynard Smith has made a number of extremely By the mid-1960s, solid theoretical work on sympatric important contributions to evolutionary biology, many of speciation was needed to help clarify the arguments and which have also found various applications well outside conflicting evidence on sympatric speciation. -
In Defense of Massive Modularity
3 In Defense of Massive Modularity Dan Sperber In October 1990, a psychologist, Susan Gelman, and three anthropolo- gists whose interest in cognition had been guided and encouraged by Jacques Mehler, Scott Atran, Larry Hirschfeld, and myself, organized a conference on “Cultural Knowledge and Domain Specificity” (see Hirsch- feld and Gelman, 1994). Jacques advised us in the preparation of the conference, and while we failed to convince him to write a paper, he did play a major role in the discussions. A main issue at stake was the degree to which cognitive development, everyday cognition, and cultural knowledge are based on dedicated do- main-specific mechanisms, as opposed to a domain-general intelligence and learning capacity. Thanks in particular to the work of developmental psychologists such as Susan Carey, Rochel Gelman, Susan Gelman, Frank Keil, Alan Leslie, Jacques Mehler, Elizabeth Spelke (who were all there), the issue of domain-specificity—which, of course, Noam Chomsky had been the first to raise—was becoming a central one in cognitive psychol- ogy. Evolutionary psychology, represented at the conference by Leda Cosmides and John Tooby, was putting forward new arguments for seeing human cognition as involving mostly domain- or task-specific evolved adaptations. We were a few anthropologists, far from the main- stream of our discipline, who also saw domain-specific cognitive pro- cesses as both constraining and contributing to cultural development. Taking for granted that domain-specific dispositions are an important feature of human cognition, three questions arise: 1. To what extent are these domain-specific dispositions based on truly autonomous mental mechanisms or “modules,” as opposed to being 48 D. -
Preferences Under Pressure
Eric Skoog Preferences Under Pressure Conflict, Threat Cues and Willingness to Compromise Dissertation presented at Uppsala University to be publicly examined in Zootissalen, EBC, Villavägen 9, Uppsala, Friday, 13 March 2020 at 10:15 for the degree of Doctor of Philosophy. The examination will be conducted in English. Faculty examiner: Associate Professor Thomas Zeitzoff (American University, School of Public Affairs). Abstract Skoog, E. 2020. Preferences Under Pressure. Conflict, Threat Cues and Willingness to Compromise. Report / Department of Peace and Conflict Research 121. 66 pp. Uppsala: Department of Peace and Conflict Research. ISBN 978-91-506-2805-0. Understanding how preferences are formed is a key question in the social sciences. The ability of agents to interact with each other is a prerequisite for well-functioning societies. Nevertheless, the process whereby the preferences of agents in conflict are formed have often been black boxed, and the literature on the effects of armed conflict on individuals reveals a great variation in terms of outcomes. Sometimes, individuals are willing to cooperate and interact even with former enemies, while sometimes, we see outright refusal to cooperate or interact at all. In this dissertation, I look at the role of threat in driving some of these divergent results. Armed conflict is rife with physical threats to life, limb and property, and there has been much research pointing to the impact of threat on preferences, attitudes and behavior. Research in the field of evolutionary psychology has revealed that threat is not a singular category, but a nuanced phenomenon, where different types of threat may lead to different responses. -
Information Systems Theorizing Based on Evolutionary Psychology: an Interdisciplinary Review and Theory Integration Framework1
Kock/IS Theorizing Based on Evolutionary Psychology THEORY AND REVIEW INFORMATION SYSTEMS THEORIZING BASED ON EVOLUTIONARY PSYCHOLOGY: AN INTERDISCIPLINARY REVIEW AND THEORY INTEGRATION FRAMEWORK1 By: Ned Kock on one evolutionary information systems theory—media Division of International Business and Technology naturalness theory—previously developed as an alternative to Studies media richness theory, and one non-evolutionary information Texas A&M International University systems theory, channel expansion theory. 5201 University Boulevard Laredo, TX 78041 Keywords: Information systems, evolutionary psychology, U.S.A. theory development, media richness theory, media naturalness [email protected] theory, channel expansion theory Abstract Introduction Evolutionary psychology holds great promise as one of the possible pillars on which information systems theorizing can While information systems as a distinct area of research has take place. Arguably, evolutionary psychology can provide the potential to be a reference for other disciplines, it is the key to many counterintuitive predictions of behavior reasonable to argue that information systems theorizing can toward technology, because many of the evolved instincts that benefit from fresh new insights from other fields of inquiry, influence our behavior are below our level of conscious which may in turn enhance even more the reference potential awareness; often those instincts lead to behavioral responses of information systems (Baskerville and Myers 2002). After that are not self-evident. This paper provides a discussion of all, to be influential in other disciplines, information systems information systems theorizing based on evolutionary psych- research should address problems that are perceived as rele- ology, centered on key human evolution and evolutionary vant by scholars in those disciplines and in ways that are genetics concepts and notions. -
States in Mind Anthony C. Lopez, Rose Mcdermott, and Michael
States in Mind States in Mind Anthony C. Lopez, Rose McDermott, and Evolution, Coalitional Psychology, and Michael Bang International Politics Petersen One of the most com- monly studied puzzles in international politics is the recurrence of coalitional competition and aggression between political groups such as states. Indeed, this pattern constitutes an enduring and central feature of all politics. Yet de- spite the tragic endurance of this leitmotif throughout history, its manifestation varies through time and space. Some wars are fought for honor or revenge, whereas others are ignited for mere opportunism or as a consequence of vari- ous misperceptions, whatever their source. We argue that evolutionary theory provides a theoretical framework that can explain both the stubborn endur- ance and dynamic diversity of coalitional behavior. Debate on the relevance of “human nature” and biological factors for explaining political behavior is not new.1 Yet the comprehensive value of evo- lutionary theory for explaining important aspects of international politics has not been adequately explicated. As we discuss below, this has in part been a consequence of general skepticism about the validity and scope of evolution- ary theory for explaining political behavior. We argue, however, that evolu- tionary psychology can generate falsiªable ex ante predictions that are of central interest to the study of international politics, and we offer several hy- potheses derived from this model to illustrate the depth of this approach. Evo- lutionary psychologists have already generated a large body of work that suggests that the human brain contains webs of psychological mechanisms, or adaptations, each designed to operate in domains relevant to modern politics, and which emerged as a product of natural selection. -
The Origin of Altruism
book reviews The origin of altruism Unto Others: The Evolution and about? I think the argument is largely seman- degree of relatedness. So we have a single Psychology of Unselfish Behavior tic, and could not be settled by observation. model, but two ways of analysing it. by Elliott Sober and David Sloan Wilson Two examples will make this clearer. More briefly, here is a second example. Harvard University Press: 1998. Pp. 394. First, consider Wilson’s ‘trait group’ Evolutionary game theory was first devel- $29.95, £19.95 model, first published in 1975 but still very oped to explain the ritualistic nature of ani- John Maynard Smith much part of his thinking. A population is mal fights. This had often been explained8 in divided into trait groups, and selection acts terms of the ‘good of the species’: it seemed It is obvious that the parts of organisms have upon them. The members then disperse and desirable to George Price and myself to specific functions. Since Darwin, this has mate randomly, and their offspring come attempt an explanation in terms of individ- been explained by natural selection, but together again in trait groups. There are two ual selection. Sober and Wilson reconsider what is the target of selection? Should indi- kinds of individual: altruists, who benefit (in this model. They come to exactly the same vidual organisms be thought of as the units terms of fitness) each of their fellow group conclusions that we reached, but argue that it of selection, or must one also consider levels members to a degree b, at a cost to themselves is a case of group selection. -
The Descent of Edward Wilson
prospectmagazine.co.uk http://www.prospectmagazine.co.uk/magazine/edward-wilson-social-conquest- earth-evolutionary-errors-origin-species/ The descent of Edward Wilson A new book on evolution by a great biologist makes a slew of mistakes The Social Conquest of Earth By Edward O Wilson (WW Norton, £18.99, May) When he received the manuscript of The Origin of Species, John Murray, the publisher, sent it to a referee who suggested that Darwin should jettison all that evolution stuff and concentrate on pigeons. It’s funny in the same way as the spoof review of Lady Chatterley’s Lover, which praised its interesting “passages on pheasant raising, the apprehending of poachers, ways of controlling vermin, and other chores and duties of the professional gamekeeper” but added: “Unfortunately one is obliged to wade through many pages of extraneous material in order to discover and savour these sidelights on the management of a Midland shooting estate, and in this reviewer’s opinion this book can not take the place of JR Miller’s Practical Gamekeeping.” I am not being funny when I say of Edward Wilson’s latest book that there are interesting and informative chapters on human evolution, and on the ways of social insects (which he knows better than any man alive), and it was a good idea to write a book comparing these two pinnacles of social evolution, but unfortunately one is obliged to wade through many pages of erroneous and downright perverse misunderstandings of evolutionary theory. In particular, Wilson now rejects “kin selection” (I shall explain this below) and replaces it with a revival of “group selection”—the poorly defined and incoherent view that evolution is driven by the differential survival of whole groups of organisms. -
A Lego Model of the Modularity of the Mind Steven J
Eastern Illinois University The Keep Faculty Research and Creative Activity Psychology January 2004 A Lego Model of the Modularity of the Mind Steven J. Scher Eastern Illinois University, [email protected] Follow this and additional works at: http://thekeep.eiu.edu/psych_fac Part of the Psychology Commons Recommended Citation Scher, Steven J., "A Lego Model of the Modularity of the Mind" (2004). Faculty Research and Creative Activity. 32. http://thekeep.eiu.edu/psych_fac/32 This Article is brought to you for free and open access by the Psychology at The Keep. It has been accepted for inclusion in Faculty Research and Creative Activity by an authorized administrator of The Keep. For more information, please contact [email protected]. A LEGO MODEL OF THE MODULARITY OF THE MIND STEVEN J. SCHER Eastern Illinois University Abstract. In this paper I propose that the dominant form of evolutionary psychology (which I term “cognitive adaptationism”) can be improved by adopting an alternative version of the concept of mental modularity. I suggest a metaphor of mental modules as Lego blocks. The Lego blocks represent a relatively small set of elementary operations that the mind/brain can carry out. These Lego blocks are repeatedly assembled in different ways to execute a wide variety of different functions. These repeated assemblies correspond more closely to the things that cognitive adaptationists have asserted are modules. Arguments in favor of the Lego model include the fact that the localized neural systems identified in the brain appear to carry out elementary operations, rather than higher-level functions, and the fact that evolution by natural selection occurs by the gradual modification of small-level features. -
Steven Pinker Why Nature & Nurture Won't Go Away
Steven Pinker Why nature & nurture won’t go away When Richard Mulcaster referred in that debates over nature and nurture 1581 to “that treasure . bestowed on evoke more rancor than just about any them by nature, to be bettered in them issue in the world of ideas. by nurture,” he gave the world a eupho- During much of the twentieth century, nious name for an opposition that has a common position in this debate was to been debated ever since. People’s beliefs deny that human nature existed at all– about the relative importance of heredi- to aver, with José Ortega y Gasset, that ty and environment affect their opinions “Man has no nature; what he has is his- on an astonishing range of topics. Do tory.” The doctrine that the mind is a adolescents engage in violence because blank slate was not only a cornerstone of the way their parents treated them of behaviorism in psychology and social early in life? Are people inherently ag- constructionism in the social sciences, gressive and sel½sh, calling for a market but also extended widely into main- economy and a strong police, or could stream intellectual life.1 they become peaceable and cooperative, Part of the blank slate’s appeal came allowing the state to wither and a spon- from the realization that many differ- taneous socialism to blossom? Is there a ences among people in different classes universal aesthetic that allows great art and ethnic groups that formerly were to transcend time and place, or are peo- 1 Carl N. Degler, In Search of Human Nature: ple’s tastes determined by their era and The Decline and Revival of Darwinism in American culture? With so much seemingly at Social Thought (New York: Oxford University stake in so many ½elds, it is no surprise Press, 1991); Steven Pinker, The Blank Slate: The Modern Denial of Human Nature (New York: Viking, 2002); Robin Fox, The Search for Soci- ety: Quest for a Biosocial Science and Morality Steven Pinker, Johnstone Family Professor in the (New Brunswick, N.J.: Rutgers University department of psychology at Harvard University, Press, 1989); Eric M. -
Theory Is Available Light
Magazine R406 Theory in Biology without which, as we know, nothing makes sense in biology. In the 1960s, the Japanese mathematical biologist Motoo Theory is Kimura conceived the neutral available light theory of evolution, which assumes that the overwhelming majority of molecular mutations Martin A. Nowak do not affect the fitness of an individual. Today most methods Many people praise Gregor for reconstructing phylogenies Mendel as the founding father of from genetic data assume the genetics. Few, however, know that neutral theory is correct. In a as a student at the University of brilliant PhD thesis submitted in Vienna he excelled in 1964, Bill Hamilton formulated the Mathematics, but failed Botany theory behind ‘selfish genes’. In Sir Ronald Fisher, with Haldane and twice, which prevented him from the 1970s, John Maynard Smith Wright one of the founders of population pursuing an academic career. He brought game theory to biology: genetics. (Courtesy of Antony Barrington- Brown and the Science Photo Library.) entered a monastery and evolutionary game theory is a continued to do science. He found generic description of evolutionary the rules of genetic inheritance dynamics whenever fitness is not population dynamics of infectious because he had a clear constant, but depends on the agents and immune cells without mathematical hypothesis even to composition of the population. At the aid of mathematical models. the extent of ignoring ambiguous about the same time, Manfred Crucial questions, such as what results that did not fit his Eigen and Peter Schuster determines the virus load in HIV mathematical expectation. pioneered an information theoretic infection, how fast is the turnover Ronald Fisher considered approach to evolution with quasi- rate of HIV-infected cells, or what Mendel as a mathematician with species theory, while Josef explains the long and variable an interest in biology. -
Evolutionary Psychology: a Primer
Evolutionary Psychology: A Primer Leda Cosmides & John Tooby Center for Evolutionary Psychology UC Santa Barbara http://www.psych.ucsb.edu/research/cep/ Introduction The goal of research in evolutionary psychology is to discover and understand the design of the human mind. Evolutionary psychology is an approach to psychology, in which knowledge and principles from evolutionary biology are put to use in research on the structure of the human mind. It is not an area of study, like vision, reasoning, or social behavior. It is a way of thinking about psychology that can be applied to any topic within it. In this view, the mind is a set of information-processing machines that were designed by natural selection to solve adaptive problems faced by our hunter-gatherer ancestors. This way of thinking about the brain, mind, and behavior is changing how scientists approach old topics, and opening up new ones. This chapter is a primer on the concepts and arguments that animate it. Debauching the mind: Evolutionary psychology's past and present In the final pages of the Origin of Species, after he had presented the theory of evolution by natural selection, Darwin made a bold prediction: "In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation." Thirty years later, William James tried to do just that in his seminal book, Principles of Psychology, one of the founding works of experimental psychology (James, 1890). In Principles, James talked a lot of "instincts". -
Evolutionary Psychology – 2007
Evolutionary Psychology www.epjournal.net – 2007. 5(4): 683-695 ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ Original Article What’s in a Name: Is “Evolutionary Psychology” Eclipsing “Sociobiology” in the Scientific Literature? Gregory D. Webster, Department of Psychology, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA. Email: [email protected] (Corresponding author) Abstract: Is the term “evolutionary psychology” supplanting “sociobiology” in the scientific literature? How influential was E. O. Wilson’s (1975) book, Sociobiology, in establishing the discipline of the same name? Similarly, how influential were the two Tooby-Cosmides chapters appearing in The Adapted Mind (Cosmides and Tooby, 1992; Tooby and Cosmides, 1992) in establishing evolutionary psychology as a viable outgrowth of sociobiology? The purpose of the present research was to answer these questions using quantitative analyses of publication trends. The Internet search engine Google Scholar was used to count the number of hits (i.e., the number of scholarly works, citations, etc.) for “sociobiology” and “evolutionary psychology” separately per year from 1960 to 2003. Interrupted time-series analyses revealed significant increases (intercept shifts) for sociobiology hits between 1974 and 1975, and for evolutionary psychology hits between 1991 and 1992. Evolutionary psychology hits also experienced a significant increase in change-over-time (a slope shift) between 1991 and 1992. Growth curve analyses revealed that the rate of growth for evolutionary psychology, which