This study investigates corporate relationships with environmental organizations by examining hyperlinks in the corporate environmental responsibility (CER) sections of the Fortune 2008 Global 500 corporate websites. It is assumed that hyperlinked organizations either represent their current inter-organizational relationship or create symbolic relationships among organizations. Results show that Asian companies have fewer hyperlink relations with other organizations compared with those in North America and Western Europe. Network analysis also confirms that U.S. companies are explicitly connected with stakeholders for CER practices, and (...) governmental organizations have a relatively central role in the global CER system. Nonprofit organizations are the most frequently hyperlinked with Fortune Global 500 corporations. (shrink)

(From the Press's Website) -/- Winner of the 2004 Lakatos Prize, Thought in a Hostile World is an exploration of the evolution of cognition, especially human cognition, by one of today's foremost philosophers of biology and of mind. Features an exploration of the evolution of human cognition. Written by one of today’s foremost philosophers of mind and language. Presents a set of analytic tools for thinking about cognition and its evolution. Offers a critique of nativist, modular versions of evolutionary psychology, (...) rejecting the example of language as a model for thinking about human cognitive capacities. Applies to the areas of cognitive science, philosophy of mind, and evolutionary psychology. -/- . (shrink)

There is nothing like an overwhelming consensus of opinion to encourage a less than rigourous approach to analyzing complex ethical issues. Unfortunately, this is nowhere more apparent than in the discussion of human reproductive cloning contained in the federal House of Representatives Standing Committee on Legal and Constitutional Affairs’ report on human cloning, released last August The report may well fulfil the first half of its project, namely the empirical task of adequately summarizing and categorizing the various submissions made to (...) the Committee. However, it is clearly inadequate as a discussion of the ethical and legal permissibility of human reproductive cloning. (shrink)

"No human now gathers for himself or herself the essential resources for life: food, shelter, clothing, and the like. Humans are obligate co-operator, and this has been true for tens of thousands of years; probably much longer. In this regard, humans are very unusual. Cooperation outside the family is rare: though it can be very profitable, it is also very risky, as cooperation makes an agent vulnerable to incompetence and cheating. This book presents a new picture of the emergence of (...) cooperation in our lineage, developing through four fairly distinct phases from a baseline that was probably fairly similar to living great apes, who cooperate, but in fairly minimal ways. As adults, they rarely depend on others when the outcome really matters. This book suggests that cooperation began to be more important for humans through an initial phase of cooperative foraging generating immediate returns from collective action in small mobile bands. This established in our lineage about 1.8 million years ago, perhaps earlier. Over the rest of the Pleistocene, cooperation became more extended in its social scale, with forms of cooperation between bands gradually establishing, and in spatial and temporal scale too, with various forms of reciprocation becoming important. The final phase was the emergence of cooperation in large scale, hierarchical societies in the Holocene, beginning about 12,000 years ago. This picture is nested in a reading of the archaeological and ethnographic record, and twinned to an account of the gradual elaboration of cultural learning in our lineage, making cooperation both more profitable and more stable"--. (shrink)

We are moral apes, a difference between humans and our relatives that has received significant recent attention in the evolutionary literature. Evolutionary accounts of morality have often been recruited in support of error theory: moral language is truth-apt, but substantive moral claims are never true. In this article, we: locate evolutionary error theory within the broader framework of the relationship between folk conceptions of a domain and our best scientific conception of that same domain; within that broader framework, argue that (...) error theory and vindication are two ends of a continuum, and that in the light of our best science, many folk conceptual structures are neither hopelessly wrong nor fully vindicated; and argue that while there is no full vindication of morality, no seamless reduction of normative facts to natural facts, nevertheless one important strand in the evolutionary history of moral thinking does support reductive naturalism—moral facts are facts about cooperation, and the conditions and practices that support or undermine it. In making our case for, we first respond to the important error theoretic argument that the appeal to moral facts is explanatorily redundant, and second, we make a positive case that true moral beliefs are a ‘fuel for success’, a map by which we steer, flexibly, in a variety of social interactions. The vindication, we stress, is at most partial: moral cognition is a complex mosaic, with a complex genealogy, and selection for truth-tracking is only one thread in that genealogy. (shrink)

In this article I develop a big picture of the evolution of human cooperation, and contrast it to an alternative based on group selection. The crucial claim is that hominin history has seen two major transitions in cooperation, and hence poses two deep puzzles about the origins and stability of cooperation. The first is the transition from great ape social lives to the lives of Pleistocene cooperative foragers; the second is the stability of the social contract through the early Holocene (...) transition to complex hierarchical societies. The first of these transitions is driven, at least initially, by individual advantage: cooperation paid off for individual foragers, initially through mutualist interaction, then through reciprocation. This argument leads to a reanalysis of the role of violence and the nature of the freeriding threat to cooperation. But the conditions that select for cooperative individuals in the Pleistocene were eroded in the Pleistocene–Holocene transition. So we need an alternative account of the survival, and indeed the expansion, of cooperation in the Holocene. Group selection driven by intercommunal conflict really may well be central to this second transition. (shrink)

Responsible leadership is rare. It is not that most leaders are irresponsible, but responsibility in leadership is frequently defined so that an important connotation of responsible leadership is ignored. This article equates responsible leadership with virtuousness. Using this connotation implies that responsible leadership is based on three assumptions—eudaemonism, inherent value, and amplification. Secondarily, this connotation produces two important outcomes—a fixed point for coping with change, and benefits for constituencies who may never be affected otherwise. The meaning and advantages of responsible (...) leadership as virtuous leadership are discussed. (shrink)

This collection reports on the latest research on an increasingly pivotal issue for evolutionary biology: cooperation. The chapters are written from a variety of disciplinary perspectives and utilize research tools that range from empirical survey to conceptual modeling, reflecting the rich diversity of work in the field. They explore a wide taxonomic range, concentrating on bacteria, social insects, and, especially, humans. -/- Part I (“Agents and Environments”) investigates the connections of social cooperation in social organizations to the conditions that make (...) cooperation profitable and stable, focusing on the interactions of agent, population, and environment. Part II (“Agents and Mechanisms”) focuses on how proximate mechanisms emerge and operate in the evolutionary process and how they shape evolutionary trajectories. Throughout the book, certain themes emerge that demonstrate the ubiquity of questions regarding cooperation in evolutionary biology: the generation and division of the profits of cooperation; transitions in individuality; levels of selection, from gene to organism; and the “human cooperation explosion” that makes our own social behavior particularly puzzling from an evolutionary perspective. (shrink)

In this paper I argue, first, that human lifeways depend on cognitive capital that has typically been built over many generations. This process of gradual accumulation produces an adaptive fit between human agents and their environments; an adaptive fit that is the result of hidden‐hand, evolutionary mechanisms. To explain distinctive features of human life, we need to understand how cultures evolve. Second, I distinguish a range of different evolutionary models of culture. Third, I argue that none of meme‐based models, dual (...) inheritance models, nor Boyd and Richerson's models fully succeed in explaining this adaptive fit between agent and the world. I then briefly develop an alternative. Finally, I explore (in a preliminary way) constraints on cultural adaptation. The processes of cultural evolution sometimes built a fit between agents and their environment, but they do not always do so. Why is folk medicine, for example, so much less reliable than folk natural history? (shrink)

Within paleoanthropology, the origin of behavioral modernity is a famous problem. Very large-brained hominins have lived for around half a million years, yet social lives resembling those known from the ethnographic record appeared perhaps 100,000 years ago. Why did it take 400,000 years for humans to start acting like humans? In this article, I argue that part of the solution is a transition in the economic foundations of cooperation from a relatively undemanding form, to one that imposed much more stress (...) on human motivational and cognitive mechanisms. The rich normative, ceremonial, and ideological lives of humans are a response to this economic revolution in forager lives; from one depending on immediate return mutualism to one depending on delayed and third-party reciprocation. (shrink)

In this article, I present a substantive proposal about the timing and nature of the final stage of the evolution of full human language, the transition from so-called “protolanguage” to language, and on the origins of a simple protolanguage with structure and displaced reference; a proposal that depends on the idea that the initial expansion of communicative powers in our lineage involved a much expanded role for gesture and mime. But though it defends a substantive proposal, the article also defends (...) and illustrates a methodological proposal too. I argue that language is a special case of a more general phenomenon—cumulative cultural evolution—and while we rarely have direct information about communication, we have more direct information about the cumulative cultural evolution of technical skill, ecological strategies, and social complexity. These same factors also enable us to make a reasonable estimate of the intergenerational social learning capacities of these communities and of the communicative demands these communities face. For example, we can, at least tentatively, identify forms of cooperation that are stable only if third party information is transmitted widely, cheaply, and accurately. So we can use these more direct markers of information accumulation to locate, in broad terms, the period in our evolutionary history during which we became lingual. (shrink)

The subsistence technology of forager communities has varied greatly over space and time. This paper (i) reviews briefly the main causal factors the literature identifies as responsible for this variation; (ii) analyzes in some detail the most prominent idea in the literature on spatial variation:Complex technology is an adaptive response to elevated risks of subsistence failure; (iii) it argues that the alleged empirical support for this hypothesis depends on dubious proxies of risk; (iv) it argues that it fails to explain (...) the subsistence technologies of desert foragers, who generally live with simple technologies in high‐risk environments; (v) it offers an alternative analysis, based on the reduced opportunity costs of complex technologies in highly seasonal environments, on the high value of typical forager targets in those environments and their relatively predictable location in space and time; and (v) the paper concludes with a conjecture about the role of environmental variation in toolkit change over deep time. (shrink)

Until relatively recently, it was often supposed that changes in the material record of hominin life indexed advances in hominin cognitive sophistication in a relatively direct way. In particular, the “Upper Paleolithic Transition”—an apparently abrupt increase in the complexity and disparity of our material culture—was thought to signal the arrival of the fully human mind. While the idea of a direct relationship between material complexity and cognitive sophistication still has some defenders, this view has largely been abandoned. It is now (...) widely appreciated that aspects of ancient hominins’ demographic and social organization have a powerful influence both on the material culture they need and the material culture they can sustain. But if this more nuanced view is right, what does the deep material record tell us about the evolution of hominin cognition? I explore that question in this article. (shrink)

This paper begins by calling attention to a puzzling feature of our deep past: an apparent mis-match between morphological evolution in our lineage, including the expansion of our brain and neocortex, and changes in material culture. Three ideas might explain this mis-match. The apparent mis-match is an illusion: change in material culture is indeed driven by biological evolution, but of a kind difficult to identify in the fossil record; the mismatch is caused by the fact that material culture is sensitive (...) to the social and demographic environment, not just the native cognitive capacities of individual agents. Innovation and its uptake is more reliable in larger social worlds. The mis-match is made possible by adaptive phenotypic plasticity; in particular, cognitive plasticity. Just as material culture evolves through cumulative cultural learning, so too do cognitive skills, including ones which make innovations in, and the transmission of, material culture more efficient. This paper is targeted on the second of these ideas, and distinguishes three different versions of the view that increases in social scale support increases in the complexity of material culture. Those are: cultural selection is more efficient in larger social worlds; larger social worlds support more specialisation, which in turn supports a more complex material culture; cultural learning is more efficient in larger social worlds. The paper argues that the first two of these pathways are probably more important than the third in explaining otherwise puzzling features of the archaeological and ethnographic record. (shrink)

The standard view of the function of reason is that it emerged to enable individuals to make better judgements and choices. Once individuals could think better, and once we had suitable communicative tools, individual reasoning acquired a public face; we reasoned together as well as privately, in our own mind. Hugo Mercier and Dan Sperber argue that this gets the story the wrong way around: reasoning evolved for public purposes: to persuade, negotiate, assess. Once it was established publically, perhaps it (...) acquired a private function too. With the exception of a few minor complaints, this evolutionary case is well made. However, Mercier and Sperber embed their evolutionary case within a modular view of the mind and suggest a modular view of public reasoning itself. While I find the evolutionary case persuasive, I am sceptical of the cognitive science framework. (shrink)

This paper has two aims. One is to defend an incrementalist view of the evolution of language, not from those who think that syntax could not evolve incrementally, but from those who defend a fundamental distinction between Gricean communication or ostensive inferential communication and code-based communication. The paper argues against this dichotomy, and sketches ways in which a code-based system could evolve into Gricean communication. The second is to assess the merits of the Sender–Receiver Framework, originally formulated by David Lewis, (...) and much elaborated and set into an evolutionary context by Brian Skyrms and colleagues, as a framework for thinking about the evolution of language. Despite the great strengths of that framework, and despite the great value of a framework that is both general and formally tractable, I argue that there are critical features of language that it fails to capture. (shrink)

This book assesses the real differences between the two conceptions of evolution.

Debates on the contingency of history have largely focused on the history of life. This article targets the supposed contingency of human history. It does not defend a global claim about the overall contingency of history. Rather, it aims to identify and explain the difference between robust and fragile historical trajectories. It does so by considering a set of contrasting cases and identifying critical differences among the cases. The analysis shows that one important source of contingency is the historical emergence (...) of command-and-control institutions; one important source of robustness is the existence of population-level processes structured by relatively stable institutions. (shrink)

Philip Kitcher’s The Ethical Project trios to vindicates ethics through an analysis of its evolutionary and cultural history, a history which in turn, he thinks, supports a particular conception of the role of moral thinking and normative practices in human social life. As Kitcher sees it, that role could hardly be more central: most of what makes human life human, and preferable to the fraught and impoverished societies of the great apes, depends on moral cognition. Prom this view of the (...) role of the ethical project as a social technology, Kitcher derives an account of moral progress and even moral truth: a normative analogue of the idea that truth is the convergence of rational enquiry. To Kitcher’s history, I present an anti-history. Most of what is good about human social life depends on the expansion of our social emotions, not on our capacities to articulate and internalise explicit norms. Indeed, since the Holocene and the origins of complex society, normative thought and normative institutions have been more prominent as tools of exploitation and oppression than as mechanisms of a social peace that balances individual desire with collective co-operation. I argue that the vindication project fails in its own terms: even given Kitcher’s distinctive pragmatic concept of vindication, history debunks rather than vindicates moral cognition. (shrink)

In his profound discussion, Sterelny draws out common themes in the contributions to this topic: selective drivers in the coevolution of cognition and culture, the role of language in it, characteristics of cumulative cultural evolution, and issues of testability. He highlights the growing body of evidence for positive feedback mechanisms in cultural evolution, but also notes that progress is piecemeal, calling for more cross‐border work between cognitive science and research on cultural evolution.

The basic idea of Birch’s analysis is plausible: normative guidance began in agents’ assessment of their own craft skills. But I suggest developing that idea in a different way. I suggest that proto-normative affect plays its guiding role diachronically, in the development of those skills, rather than synchronically, in modulating their moment-by-moment execution. More importantly, I suggest a different pathway to normative affect’s direction at second and third parties. Normative response became social in the context of skilled collaborative activities, for (...) in those activities others’ failures have material consequences for each agent. In such collaborations, all have reason to care about others’ skill, or lack of it. (shrink)

Hutto and Satne identify three research traditions attempting to explain the place of intentional agency in a wholly natural world: naturalistic reduction; sophisticated behaviourism, and pragmatism, and suggest that insights from all three are necessary. While agreeing with that general approach, I develop a somewhat different package, offering an outline of a vindicating genealogy of our interpretative practices. I suggest that these practices had their original foundation in the elaboration of much more complex representation-guided control structures in our lineage and (...) the support and amplification of those control structures through external resources. Cranes became increasingly important in the explanation of systematically successful action. These more complex representational engines coevolved with selection to detect and respond to the control structures of others. Since much of that selection was driven by the advantages of cooperation and coordination, in part these control structures were co-opted as external signals and guarantees, in cooperation and coordination. As the time depth of cooperation and co-ordination extended, these public signals of belief and intent acquired secondary functions, as mechanisms to stabilise and structure control systems, making humans not just more transparent to one another at a time, but more predictable over time. Mindshaping, not just mindreading, became increasingly important in our lineage. (shrink)

This paper responds to Birch and Buskell's thoughtful critique. In it, I defend my use of behavioural ecology. I argue, contra Birch and Buskell, that I can give a principled defence of the emergence of conventions for respecting property, modelling as a network of pairwise iterated PDs between incipient farmers. Second, I defend my scepticism about the power of cultural group selection to optimise community normative packages. Finally, I located my views, as requested, against those of The dawn of everything. (...) I argue that the more complex “original position” envisaged in Dawn depends on special conditions rarely found on Pleistocene Africa. (shrink)

In the U.S. there has been considerable interest in connecting low-income households to alternative food networks like Community Supported Agriculture. To learn more about this possibility we conducted a statewide survey of CSA members in California. A total of 1149 members from 41 CSAs responded. Here we answer the research question: How do CSA members’ socioeconomic and demographic backgrounds, household conditions potentially interfering with membership, and CSA membership experiences vary between lower-income households and higher-income households? We divided members into LIHHs (...) and HIHHs. We present comparisons of LIHHs’ and HIHHs’ employment, race/ethnicity, household composition and education, use of food support, and enjoyment of food-related activities; conditions interfering with membership and major life events; and sources of information influencing decision to join, reasons for joining, ratings of importance of and satisfaction with various CSA attributes, gaps between importance of and satisfaction with various CSA attributes, valuing of the share and willingness to pay more, and impacts of membership. We find that LIHHs are committed CSA members, often more so than HIHHs, and that CSA members in California are disproportionately white, but that racial disproportionality decreases as incomes increase. We conclude by considering: the economic risks that LIHHs face in CSA membership, the intersection of economic risks with race/ethnicity and cultural coding in CSA; and the possibilities of increasing participation of LIHH in CSA. (shrink)

How can we have a sense of the presence of ordinary three-dimensional objects (e.g., an apple on my desk, a partially occluded cat behind a picket fence) when we are only presented with some parts of objects perceived from a particular egocentric viewpoint (e.g., the facing side of the apple, the unoccluded parts of the cat)? This paper presents and defends a novel answer to this question by incorporating insights from two prominent contemporary theories of perception, naïve realism and sensorimotor (...) theory. Naïve realism is the view that perception is fundamentally a matter of obtaining a relation of ‘acquaintance’ with some mind-independent entities (e.g., objects, properties, events). Sensorimotor theory holds that perception involves implicit practical understanding or ‘anticipation’ of the covariance between movements and sensory changes. I argue that perceptual presence is best accounted for in terms of the combination of our direct ‘acquaintance’ with some parts of perceived objects and sensorimotor ‘anticipations’ of how the objects would look different depending on some movements and actions. (shrink)

This chapter connects the major transitions to evolvability and its evolution. It reviews a three-pulse model of the conditions that make the evolution of complexity possible. It specifically outlines the life up to the evolution of fully equipped prokaryote cells, the phase of microbial evolution, and the third phase that sees the evolution of complex development. It compares the prokaryote and multicellular evolvability. The deeply obscure problem of precellular evolution is also evaluated. This chapter shows that individual properties of developmental (...) mechanisms are significant to evolvability, but they are not all that is important. (shrink)

Considering questions at the intersection of time and fiction deepens our understanding of fiction, introduces new questions for philosophy of time, and brings analytic philosophy in discussion with narratology. Philosophers debate whether fictional time can be tensed, whether fictional time can branch, repeat, pause, rewind, or skip and whether fictional time travel is possible. Much of the way we answer these questions will depend on our overall commitment to the nature of fiction. It’s also unclear what, if anything, we can (...) learn about the metaphysics of time from fiction. This chapter will introduce readers to discussions that are shaping the debates in this domain. (shrink)

There is a very striking difference between even the simplest ethnographically known human societies and those of the chimps and bonobos. Chimp and bonobo societies are closed societies: with the exception of adolescent females who disperse from their natal group and join a nearby group (never to return to their group of origin), a pan residential group is the whole social world of the agents who make it up. That is not true of forager bands, which have fluid memberships, and (...) regular associations with neighbouring bands. They are components of a larger social world. The open and fluid character of forager bands brings with it many advantages, so the stability of this more vertically complex form of social life is not difficult to explain, once it establishes. But how did it establish, if, as is likely, earlier hominin social worlds resemble those of our close pan relatives in the suspicion (even hostility) of one band to another? How did hominin social organisation transition from life in closed bands, each distrustful of its neighbours, to the much more open social lives of foragers? I will discuss and synthesise two approaches to this problem, one ecological, based on the work of Robert Layton and his colleagues, and another that is organised around an expansion of kin recognition, an idea primarily driven by Bernard Chapais. The paper closes by discussing potential archaeological signatures both of more open social worlds, and of the supposed causal drivers of such worlds. (shrink)

This article has both substantive and methodological goals. Methodologically, it shows that rational choice theory is an especially important tool for guiding research in contexts in which agents appear to be acting against their best interests. The Neolithic transition is one such case, and the article develops a substantive conception of that transition, illustrating the heuristic power of behavioral ecology.

What do events such as scandals, industrial accidents, activist threats, and mass shootings have in common? They can all trigger an audience’s stigma judgment about the organization involved in the event. Despite the prevalence of these stigma-triggering events, management research has provided little conceptual work to characterize the dimensions and processes of organizational event stigma. This article takes the perspective of the evaluating audience to unpack the stigma judgment process, identify critical dimensions for categorizing types of event stigma, and explore (...) the role of the stigmatizers’ aesthetic, emotional, and cognitive reactions as well as their practical considerations in producing what we call “sticky stigmas.” Our event stigma typology provides clarity regarding how stigmas differ based on the types of events and audiences’ reactions and why some event stigmas are stronger and more long-lasting than others. We highlight the role of emotions and aesthetics in stigma formation and the various ethical dilemmas that influence stigma stickiness. (shrink)

Individuals’ beliefs about the malleability of emotions have been theorised to play a role in their psychological distress by influencing emotion regulation processes, such as the use of emotion regulation strategies. We conducted a meta-analysis to test this idea across studies with a focus on the relationships between emotion malleability beliefs and five distinct emotion regulation strategies: cognitive reappraisal, suppression, avoidance, rumination, and acceptance. Further, using two-stage meta-analytic structural equation modelling (TSSEM), we examined whether the emotion regulation strategies mediate the (...) cross-sectional relationship between emotion malleability beliefs and psychological distress across studies. Thirty-seven studies were included in the meta-analyses and 55 cross-sectional studies were included in the TSSEM. Results demonstrated that, across studies, emotion malleability beliefs were significantly associated with greater use of putatively helpful strategies (particularly with cognitive reappraisal) and less use of putatively unhelpful strategies (particularly with avoidance). The use of cognitive reappraisal and avoidance partially mediated the relationship between emotion malleability beliefs and psychological distress. These results highlight the importance of considering beliefs about the malleability of emotions in the context of emotion regulation. These findings suggest the potential role of emotion malleability beliefs in interventions for individuals with emotion regulation-related difficulties and psychological distress. (shrink)

In his 21st-century explorer’s uniform, Nordiclooking Spencer Wells kneels alongside nearly naked, smaller, African hunters who sport bows and arrows. Featured on the National Geographic Web site, “Explorer-in-Residence” Wells hold a bachelor’s and doctorate degree in biology. He is also a filmmaker who both masterminded and hosted National Geographic’s 2002 documentary, The Journey of Man: A Genetic Odyssey, which explains to non-scientists a molecular anthropology narrative of how humans left Africa 60,000 years ago to populate the rest of the globe.In (...) his latest exploratory adventure, Wells is the project leader and spokesperson for the recently announced “Genographic Project,” a “landmark study of the human journey.” In April 2005, National Geographic and IBM, with funding from the Waitt Family Foundation, launched the Genographic Project as a five-year “research partnership” that aims to “trace the migratory history of the human species” and “map how the Earth was populated.”. (shrink)

The articles in this issue represent the pursuit of a new understanding of the human past, one that can replace the neo-saltationist view of a human revolution with models that can account for the complexities of the archaeological record and of human social lives. The articulation of archaeological, philosophical, and biological perspectives seems to offer a strong foundation for exploring available evidence, and this was the rationale for collecting these particular articles. Even at this preliminary stage there is a coherence (...) emerging in proposals: the origin and operation of symbolically rich, complexly signaling human social systems was the consequence of the long-term evolution of multiple components of perceiving and negotiating social interactions, a contingent outcome of myriad adaptive shifts rather than a single event. (shrink)

ExtractBrian Skyrms's Signals has the virtues familiar from his Evolution of the Social Contract and The Stag Hunt. He begins with a very simple model of agents in interaction, and in a series of brief and beautifully clear chapters, this model and its successors are explored, elaborated, connected and illustrated through biological theory and the social sciences. Signals borrows its core model from David Lewis: it is Lewis's signalling game. In this game, two agents interact. One agent can observe which (...) of two equi-probable states the world is in, but that agent cannot act directly and profitably on that information. However, the informed agent can act in a way that will be perceptually salient to a second agent: say, by raising a red or a green flag. The second agent does have the capacity to respond appropriately to each state of the world. If that second agent chooses the right option, given the state of the world, both are rewarded. If the second agent fails to choose the right action, neither are. Obviously, the two agents are best off if they have a practice in which the informed agent regularly chooses a distinct, salient cue in response to each of the two world states, and in which the powerful agent uses that cue to select the rewarding act. Less obviously, agents with simple trial and error learning capacities can learn to signal and respond: neither explicit negotiation nor cognitive sophistication are required. Likewise, if individual agents do not have the capacity to learn, but if they breed true but with some variation, the evolutionary version of trial and error learning can take a population to one of the signalling system equilibria. View HTML Send article to KindleTo send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle. Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply. Find out more about the Kindle Personal Document Service.A GLASS HALF-FULL: BRIAN SKYRMS'S SIGNALSVolume 28, Issue 1Kim Sterelny DOI: https://doi.org/10.1017/S0266267112000120Your Kindle email address Please provide your Kindle email.@free.kindle.com@kindle.com Available formats PDF Please select a format to send. By using this service, you agree that you will only keep articles for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services. Please confirm that you accept the terms of use. Cancel Send ×Send article to Dropbox To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Dropbox. A GLASS HALF-FULL: BRIAN SKYRMS'S SIGNALSVolume 28, Issue 1Kim Sterelny DOI: https://doi.org/10.1017/S0266267112000120Available formats PDF Please select a format to send. By using this service, you agree that you will only keep articles for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services. Please confirm that you accept the terms of use. Cancel Send ×Send article to Google Drive To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive. A GLASS HALF-FULL: BRIAN SKYRMS'S SIGNALSVolume 28, Issue 1Kim Sterelny DOI: https://doi.org/10.1017/S0266267112000120Available formats PDF Please select a format to send. By using this service, you agree that you will only keep articles for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services. Please confirm that you accept the terms of use. Cancel Send ×Export citation Request permission. (shrink)

The use of ethnography to understand archaeology is both prevalent and controversial. This paper develops an alternative approach, using ethnography to build and test a general theory of forager behaviors, and their variations in different conditions, one which can then be applied even to prehistoric sites differing from contemporary experience. Human behavioral ecology is chosen as the framework theory, and forager social learning as a case study. The argument is then applied to social learning in the late Pleistocene, and hence (...) to a famous archaeological puzzle: the late Pleistocene acceleration of technical innovation and regional differentiation. (shrink)