We consider a situation in which individuals search for accurate decisions without direct feedback on their accuracy, but with information about the decisions made by peers in their group. The “wisdom of crowds” hypothesis states that the average judgment of many individuals can give a good estimate of, for example, the outcomes of sporting events and the answers to trivia questions. Two conditions for the application of wisdom of crowds are that estimates should be independent and unbiased. Here, we study (...) how individuals integrate social information when answering trivia questions with answers that range between 0% and 100%. We find that, consistent with the wisdom of crowds hypothesis, average performance improves with group size. However, individuals show a consistent bias to produce estimates that are insufficiently extreme. We find that social information provides significant, albeit small, improvement to group performance. Outliers with answers far from the correct answer move toward the position of the group mean. Given that these outliers also tend to be nearer to 50% than do the answers of other group members, this move creates group polarization away from 50%. By looking at individual performance over different questions we find that some people are more likely to be affected by social influence than others. There is also evidence that people differ in their competence in answering questions, but lack of competence is not significantly correlated with willingness to change guesses. We develop a mathematical model based on these results that postulates a cognitive process in which people first decide whether to take into account peer guesses, and if so, to move in the direction of these guesses. The size of the move is proportional to the distance between their own guess and the average guess of the group. This model closely approximates the distribution of guess movements and shows how outlying incorrect opinions can be systematically removed from a group resulting, in some situations, in improved group performance. However, improvement is only predicted for cases in which the initial guesses of individuals in the group are biased. (shrink)

Case presentations, esthetics, insurance considerations, communicable diseases, referral questions, dental phobia, and legal concerns all play a role in doctor-patient relationships. These topics, and many others, are the subject of this one-of-a-kind resource, designed to show dental students and practitioners how to approach patient relationships.

Is there progress in philosophy? A glass-half-full view is that there is some progress in philosophy. A glass-half-empty view is that there is not as much as we would like. I articulate a version of the glass-half-empty view, argue for it, and then address the crucial question of what explains it.

A month ago, I bought an iPhone. The iPhone has already taken over some of the central functions of my brain. It has replaced part of my memory, storing phone numbers and addresses that I once would have taxed my brain with. It harbors my desires: I call up a memo with the names of my favorite dishes when I need to order at a local restaurant. I use it to calculate, when I need to figure out bills and tips. (...) It is a tremendous resource in an argument, with Google ever present to help settle disputes. I make plans with it, using its calendar to help determine what I can and can’t do in the coming months. I even daydream on the iPhone, idly calling up words and images when my concentration slips. Friends joke that I should get the iPhone implanted into my brain. But if Andy Clark is right, all this would do is speed up the processing, and free up my hands. The iPhone is part of my mind already. Clark is a connoisseur of the myriad ways in which the mind relies on the world to get its work done. The first part of this marvelous book explores some of these ways: the extension of our bodies, the extension of our senses, and crucially, the use of language as a tool to extend our thought. The second part of the book defends the thesis that in at least some of these cases, the world is not serving as a mere instrument for the mind. Rather, the relevant parts of the world have become parts of my mind. My iPhone is not my tool, or at least it is not wholly my tool. Parts of it have become parts of me. This is the thesis of the extended mind: when parts of the environment are coupled to the brain in the right way, they become parts of the mind. The thesis has a long history: I am told that there are hints of it in Dewey, Heidegger, and Wittgenstein. But no-one has done as much to give life to the idea as Andy Clark. In a series of important books and articles—Being There, Natural-Born Cyborgs, “Magic words: How language augments human computation”, and many others—he has explored the many ways in which the boundaries between mind and world are far more flexible than one might have thought.. (shrink)

(1a) If Prince Albert Victor killed those people, he is Jack the Ripper (and Jack the Ripper killed those people). (1b) If Prince Albert Victor had killed those people, Jack the Ripper wouldn't have (and Prince Albert wouldn't have been Jack the Ripper).

Pax6 is a transcription factor essential for the development of tissues including the eyes, central nervous system and endocrine glands of vertebrates and invertebrates. It regulates the expression of a broad range of molecules, including transcription factors, cell adhesion and short‐range cell–cell signalling molecules, hormones and structural proteins. It has been implicated in a number of key biological processes including cell proliferation, migration, adhesion and signalling both in normal development and in oncogenesis. The mechanisms by which Pax6 regulates its downstream (...) targets likely involve the use of different splice variants and interactions with multiple proteins, allowing it to generate different effects in different cells. Extrapolation to developmental transcription factors in general suggests that variation in the nature of individual factors is likely to contribute to the emergence of differences between tissues. BioEssays 24:1041–1051, 2002. © 2002 Wiley‐Periodicals, Inc. (shrink)

Although the advising literature has emphasized the importance of good academic advising, there has been little emphasis on ethical issues. NACADA: The Global Community for Academic Advising provides Core Values to guide ethical behavior. This study used an experimental design to examine perspectives of ethical behavior among faculty, staff, and students. All groups could differentiate between ethical and unethical extremes, but students had difficulty differentiating between ethical and neutral behavior. All groups hesitated to rate advisors as highly ethical or unethical. (...) Even when behavior was seen as less ethical, students and faculty/staff perceived limited opportunity for students to do something about that behavior, such as change advisors. Suggestions are offered to increase the likelihood of more ethical behavior within advisement. (shrink)

This paper is an edited transcription of a talk at the 1997 Montreal symposium on "Consciousness at the Frontiers of Neuroscience". There's not much here that isn't said elsewhere, e.g. in "Facing Up to the Problem of Consciousness" and "How Can We Construct a Science of Consciousness?"]].

Where does the mind stop and the rest of the world begin? The question invites two standard replies. Some accept the demarcations of skin and skull, and say that what is outside the body is outside the mind. Others are impressed by arguments suggesting that the meaning of our words "just ain't in the head", and hold that this externalism about meaning carries over into an externalism about mind. We propose to pursue a third position. We advocate a very different (...) sort of externalism: an _active externalism_, based on the active role of the environment in driving cognitive processes. (shrink)

This essay argues that the American psychologist and philosopher William James should be viewed in the Lutheran Reformation’s tradition because this viewpoint offers the hermeneutical key to his philosophy of religion. Though James obviously didn’t ascribe to biblical authority, he expressed the following religious sensibilities made possible by Martin Luther and his contemporaries: 1) challenge of prevailing systems, 2) anti-rationalism, 3) being pro-religious experience and dynamic belief, 4) need for a personal, caring God, and also 5) a gospel of religious (...) comfort. This essay asks, in one specifi c form, how religious concerns can hold steady over time but cause very different expressions of faith. (shrink)

This essay argues that the American psychologist and philosopher William James should be viewed in the Lutheran Reformation’s tradition because this viewpoint offers the hermeneutical key to his philosophy of religion. Though James obviously didn’t ascribe to biblical authority, he expressed the following religious sensibilities made possible by Martin Luther and his contemporaries: 1) challenge of prevailing systems, 2) anti-rationalism, 3) being pro-religious experience and dynamic belief, 4) need for a personal, caring God, and also 5) a gospel of religious (...) comfort. This essay asks, in one specific form, how religious concerns can hold steady over time but cause very different expressions of faith. (shrink)

This book is a specialized monograph on the development of the mathematical and computational metatheory of reductive logic and proof-search, areas of logic that are becoming important in computer science. A systematic foundational text on these emerging topics, it includes proof-theoretic, semantic/model-theoretic and algorithmic aspects. The scope ranges from the conceptual background to reductive logic, through its mathematical metatheory, to its modern applications in the computational sciences. Suitable for researchers and graduate students in mathematical, computational and philosophical logic, and in (...) theoretical computer science and artificial intelligence, this is the latest in the prestigous world-renowned Oxford Logic Guides, which contains Michael Dummet's Elements of intuitionism (2nd Edition), Dov M. Gabbay, Mark A. Reynolds, and Marcelo Finger's Temporal Logic Mathematical Foundations and Computational Aspects, J. M. Dunn and G. Hardegree's Algebraic Methods in Philosophical Logic, H. Rott's Change, Choice and Inference: A Study of Belief Revision and Nonmonotonic Reasoning, and P. T. Johnstone's Sketches of an Elephant: A Topos Theory Compendium: Volumes 1 and 2. (shrink)

Surely one of the most interesting problems in the study of mind concerns the nature of sentience. How is it that there are sensations, rather than merely sensings? What is it like to be a bat -- or why is it like anything at all? Why aren't we automata or responding but unfeeling Zombies? How does neural activity give rise to subjective experience? As Leibniz put the problem : _It must be confessed, however, that Perception_ [consciousness?]_, and that which depends (...) upon it, are_ _inexplicable by mechanical means, that is to say, by figures and motions. Supposing that there were a_ _machine whose structure produced thought, sensation, and perceptions, we could conceive of it as increased_ _in its interior size with the same proportions until one was able to enter into its interior, as he would into a_ _mill. Now, on going into it he would find only pieces working upon one another, but never would he find_ _anything to explain Perception._ [Montgomery trans.]. (shrink)

Background and purpose Changes to deceased organ donation policy in the USA, including opt-out and priority systems, have been proposed to increase registration and donation rates. To study attitudes towards such policies, we surveyed healthcare students to assess support for opt-out and priority systems and reasons for support or opposition. Methods We investigated associations with supporting opt-out, including organ donation knowledge, altruism, trust in the healthcare system, prioritising autonomy and participants’ evaluation of the moral severity of incorrectly assuming consent in (...) opt-in systems or opt-out systems, by conducting an online survey among healthcare students at a large academic institution. Results Of 523 respondents, 86% supported opt-out, including 53% who strongly supported the policy. The most popular reason for supporting opt-out was the potential for increased donation rates, followed by convenience for those not registered but willing to donate. The most popular reason for opposing opt-out was the belief that presuming consent is morally wrong. Those strongly supporting opt-out viewed the opt-in error as more morally unacceptable, and had higher knowledge and altruism scores. Those opposing opt-out viewed the opt-out error as more unacceptable, and had higher autonomy scores. 48% of respondents supported priority within opt-in systems; 31% supported priority in opt-out. Conclusions There is strong support for opt-out organ donation among healthcare students, influenced by both practical and moral considerations. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Ethics & the Environment 8.2 (2003) 31-41 [Access article in PDF] Threescore and TenFire, Place, and Loss in the West David Strohmaier The only conclusion I have ever reached about trees is that I love all trees, but I am in love with pines. —Aldo Leopold, A Sand County Almanac 1He died protecting his pines. It was spring, 1948, and Aldo Leopold was spending time with his family (...) at their beloved cabin they called "the Shack." Over the years, he had planted close to 30,000 trees and shrubs on the property, trying to resuscitate a tired Wisconsin sand farm into some semblance of ecological health. 2 Leopold was keenly aware of fire's natural role in ecosystems, but sometimes there's more to fire and living with fire than energy flow, nutrient flush, and plant physiology. 3During the Leopolds' stay at the Shack, a neighbor's trash fire, fanned by a west wind, escaped its bounds and threatened to overtake the pines. Alone, along one flank of the fire, Aldo suffered a heart attack and was later found dead, lying on his back in the smoldering grass. 4 For the love of pines.In A Sand County Almanac (accepted for publication just one week before his death), Leopold explores several possible reasons for his bias [End Page 31] towards pines: maybe it's because he planted the pines, or pines are rare where he lives, or pines have a longer life expectancy than other trees, or pines are evergreens, or because his neighbors don't have many pines on their land, or pines are worth more to the lumberman than other species, or pines engender more plant diversity than other species. In the end, he concludes that our plant biases reflect not only vocations but avocations, with a delicate allocation of priority as between industry and indolence. The farmer who would rather hunt grouse than milk cows will not dislike hawthorn, no matter if it does invade his pasture. The coon-hunter will not dislike basswood, and I know of quail hunters who bear no grudge against ragweed, despite their annual bout with hayfever. Our biases are indeed a sensitive index to our affections, our tastes, our loyalties, our generosities, and our manner of wasting weekends. 5Leopold's last act in life—fighting a fire endangering something he valued—testifies to the tension between Leopold's concept of thinking like a mountain and our reality of living in the present, between mountain time and human time. It's doubtful that the landscape around the Shack would have suffered permanent damage even if the fire overran his pines. Some trees would have burned and died, but, eventually, the land would revegetate and more pines could be planted. But for humans who, according to the psalmist, live but "[t]hreescore and ten, or even by reason of strength fourscore," 6 we may never see our pines, or any other part of the landscape, fully healed, assuming it even can be. One tree, or grove of trees, is not necessarily interchangeable with another. Places can be lost and never replaced. This is one reason why philosopher Robert Elliot is so skeptical of ecological restoration. Like a work of art, simply replacing it with the most exacting replica will never fully replace the original, for part of an object's value derives from its history: who painted or sculpted it, when it was crafted, the reason behind its contours and colors. 7 Not only are exact replicas in nature hard to come by (even though our science and technology of restoration is improving), but some values can never be restored.Some things are worth protecting from fire simply because they're important to us—even a part of us—and not necessarily because they're resources on their way to becoming beef, venison, or two-by-fours. What's critical, though, as we struggle to live in a land that burns, is getting clear about how we want that land to look and why. I fear that we... (shrink)

Stephen Pinker sets out over a dozen arguments in The language instinct (Morrow, New York, 1994) for his widely shared view that natural language is inadequate as a medium for thought. Thus he argues we must suppose that the primary medium of thought and inference is an innate propositional representation system, mentalese. I reply to the various arguments and so defend the view that some thought essentially involves natural language. I argue mentalese doesn't solve any of the problems Pinker cites (...) for the view that we think in natural language. So I don't think I think the way he thinks I think. (shrink)

Working memory is the system responsible for maintaining and manipulating information, in the face of ongoing distraction. In turn, WM span is perceived to be an individual-differences construct reflecting the limited capacity of this system. Recently, however, there has been some evidence to suggest that WM capacity can increase through training, raising the possibility that training can functionally alter the neural structures supporting WM. To address the hypothesis that the neural substrates underlying WM are targeted by training, we conducted a (...) meta-analysis of functional magnetic resonance imaging studies of WM training using Activation Likelihood Estimation. Our results demonstrate that WM training is associated exclusively with decreases in blood oxygenation level-dependent responses in clusters within the fronto-parietal system that underlie WM, including the bilateral inferior parietal lobule, middle and superior frontal gyri, and medial frontal gyrus bordering on the cingulate gyrus. We discuss the various psychological and physiological mechanisms that could be responsible for the observed reductions in the BOLD signal in relation to WM training, and consider their implications for the construct of WM span as a limited resource. (shrink)

T h i s article examines the ethical implications of the desirefor disembodiment situated in the texts and technologies of cyberspace. The article is divided into 2 parts. The first traces the conceptual history of dualism, demonstrating its exclusive cultural politics and investigating the socio-political consequences of encoding this metaphysical information in contemporary media technology. The second part examines the material conditions of new communication technology, arguing that the issue of access reduplicates in practice the exclusivity of dualism. The article (...) concludes by investigating the ethical implications of employing dualistic metaphysics as a legitimizing narrative of media technology and cyberculture. (shrink)

Originally published: Oxford: Clarendon Press, 1932.

There is growing interest in the use of technology to enhance the tracking and quality of clinical information available for patients in disaster settings. This paper describes the design and evaluation of the Wireless Internet Information System for Medical Response in Disasters (WIISARD).

Microscale techniques have been applied to biological assays for nearly two decades, but haven't been widely integrated as common tools in biological laboratories. The significant differences between several physical phenomena at the microscale versus the macroscale have been exploited to provide a variety of new types of assays (such as gradient production or spatial cell patterning). However, the use of these devices by biologists seems to be limited by issues regarding biological validation, ease of use, and the limited available readouts (...) for assays done using microtechnology. Critical validation work has been done recently that highlights the current challenges for microfluidic methods and suggest ways in which future devices might be improved to better integrate with biological assays. With more validation and improved designs, microscale techniques hold immense promise as a platform to study aspects of cell biology that are not possible using current macroscale techniques. BioEssays 30:811–821, 2008. © 2008 Wiley Periodicals, Inc. (shrink)

Hierarchical systems such as cortical tissue will indeed exhibit dynamics that are scale-dependent, but Nunez's conjecture that theoretically independent transfer functions for each level can be specified and then combined ignores the fact that, in cortex, the same excitatory neuronal populations will contribute to both local and global dynamics.

Purpose: Our aim was to determine if self-determined motivation (SDM) in elite, men’s soccer changes over time and differs as a function of age, skill-grouping, and engagement in soccer play and practice. We tested predictions from the Developmental Model of Sport Participation (DMSP) regarding relations between practice and play and SDM among both elite and non-elite samples. Methods: Elite youth soccer players in the UK (n = 31; from the Under 13/U13 yr and U15 yr age groups) completed practice history (...) and motivation questionnaires at time1 (T1) and ~2 years later (T2: now U15 yr & U17 yr). Non-elite players (n = 32; from U15 yr and U17 yr) completed the same questionnaires at T2 only. Results: For the elite groups, global SDM decreased over time for the current U17 group (from U15), but no change was seen for the current U15 group (from U13). Age group differences at T2 mirrored these data, with U17 players showing lower global SDM and higher controlled motivation than U15 elites. The non-elite players did not show age group differences, but elites scored higher for global SDM and autonomous motivation than non-elites. The recent hours accumulated in practice negatively correlated with global SDM in elite and non-elite groups, but play was unrelated to measures of motivation. Conclusions: Differences in SDM as a function of age and skill point towards the dynamic nature of these motivations over time, likely a result of proximity to external rewards related to professional status. Although high volumes of practice are related to lower global SDM in both skill groups, the absence of any relations between SDM and soccer play does not support a key prediction related to the DMSP. (shrink)