In amblyopia, abnormal visual experience during development leads to an enduring loss of visual acuity in adulthood. Physiological studies in animal models suggest that intracortical GABAergic inhibition may mediate visual deficits in amblyopia. To better understand the relationship between visual cortical γ-aminobutyric acid (GABA) and perceptual suppression in persons with amblyopia (PWA), we employed magnetic resonance spectroscopy (MRS) to quantify GABA levels in both PWA and normally-sighted persons (NSP). In the same individuals, we obtained psychophysical measures of perceptual suppression for (...) a variety of ocular configurations. In PWA, we found a robust negative correlation between the depth of amblyopia (the difference in visual acuity between the amblyopic and non-amblyopic eyes) and GABA concentration that was specific to visual cortex and was not observed in a sensorimotor cortical control region. Moreover, lower levels of visual cortical GABA were associated with weaker perceptual suppression of the fellow eye by the amblyopic eye and stronger suppression of the amblyopic eye by the fellow eye. Taken together, our findings provide evidence that intracortical GABAergic inhibition is an important component of the pathology of human amblyopia and suggest possible therapeutic interventions to restore vision in the amblyopic eye through enhancement of visual cortical GABAergic signaling in PWA. (shrink)

Byrne & Russon's target article displays all the difficulties encountered when one fails to take a methodological behaviourist approach to imitation. Their conceptual apparatus is grounded in a mixture of introspection and folk psychology. Their distinction between action-level and program-level imitation falters on goal imputation for sequential acts. In an alternative gradient descent model, behaviour can be simulated as a frustration/satisfaction gradient descent in the animal's “potentiality space,” as defined by knowledge, inventiveness, and the surrounding environment.

Like _Beyond All Appearances_,_ _which it supplements, Paul Weiss’s new book is a fundamental work which faces all the hard issues which are not only at the heart of philosophy but at the core of our entire culture. Readers of Mr. Weiss’s phenomenology of religion will need no introduction to this new work which expands and clari­fies many of the issues raised in _Beyond All Appearances. _However, no knowl­edge of Paul Weiss’s previous books is required to understand and (...) appreciate this brilliant new exposition. Weiss’s plain style makes his ideas accessible to all intelligent readers, whether or not they have been trained as professional philosophers. Here in _First Considerations _Mr. Weiss addresses himself to such topics as actuality, internalization, evidence, names, substance, being, natures and possibilities, existence, unity and the cosmos—issues which have engrossed him as a moral philosopher and meta­physician throughout his distinguished career. In his progress through the ideas and issues expounded in this new book Mr. Weiss is concerned with the human condition distinctive of this species of ours. Rigorously applied, his moral philosophy is as complete and thorough as that of any of the major thinkers, and provides as complete a guide as, for example, that of Buddhism. A highly original work, no doubt well in advance of current trends in philosophy, _First Considerations _will provoke further thought and discussion and will be regarded as a seminal work in modern philosophical approaches. (shrink)

2. Because of the possibility of lies, or the misuse of language, I believe that Professor Hempel's formulation of the problem of empirical certainty must be interpreted as a convenient abbreviation, in linguistic terms, of a question about beliefs. A complete formulation of the question would have to make some reference to the speaker's beliefs as he utters an "experiential statement.".

Eliminative materialism is the thesis that our common-sense conception of psychological phenomena constitutes a radically false theory, a theory so fundamentally defective that both the principles and the ontology of that theory will eventually be displaced, rather than smoothly reduced, by completed neuroscience. Our mutual understanding and even our introspection may then be reconstituted within the conceptual framework of completed neuroscience, a theory we may expect to be more powerful by far than the common-sense psychology it displaces, and more substantially (...) integrated within physical science generally. My purpose in this paper is to explore these projections, especially as they bear on (1) the principal elements of common-sense psychology: the propositional attitudes (beliefs, desires, etc.), and (2) the conception of rationality in which these elements figure. (shrink)

The Mind-Body Problem Questions: What is the mind? What is its connection to the body? Most basic division of answers: Dualist and Materialist (or Physicalist) responses.

In lieu of an abstract, here is a brief excerpt of the content:"The Fittest Man in the Kingdom":Thomas Reid and the Glasgow Chair of Moral PhilosophyPaul Wood (bio)Paul Wood Paul Wood is at the Department of History, University of Victoria, PO Box 3045, MS 7381, Victoria BC V8W 3P4 Canada. email: [email protected] August 1996Revised January 1997Notes. An earlier version of this paper was delivered at a plenary session of the 23rd International Hume Conference held at the University of (...) Nottingham. For comments and/or references, the author wishes to thank Roger Emerson, Carol Gibson-Wood, Knud Haakonssen, Ian Simpson Ross, Stephen Snobelen, M. A. Stewart, and the anonymous Hume Studies referees. For permission to cite and quote from manuscripts, he is grateful to the Keeper of the Manuscripts of Scotland as well as to the Librarians of Aberdeen University Library, Edinburgh University Library, Glasgow University Archives and Business Records Centre, Glasgow University Library (Department of Special Collections), the Mitchell Library Glasgow, and Dr. Williams' Library.1. Although little information survives regarding Law's teaching, we do know that he discussed Pufendorf in his classes; see Christine Mary King [Shepherd], "Philosophy and Science in the Arts Curriculum of the Scottish Universities in the Seventeenth Century," (Unpublished Ph.D. Dissertation, University of Edinburgh, 1974), 177. Carmichael's edition of Pufendorf first appeared in Glasgow in 1718, and a second edition was published in Edinburgh in 1724 while Hume was still a student there.2. The surviving correspondence between the two men from this period is to be found in The Letters of David Hume, ed. J.Y.T. Greig, 2 vols. (Oxford: Clarendon Press, 1932), I 32-35; 36-40; 45-48 (hereafter abbreviated as HL).3. The first detailed discussion of the 1745 election appeared in the introduction to David Hume, A Letter from a Gentleman to His Friend in Edinburgh, edited by Ernest C. Mossner and John V. Price (Edinburgh: Edinburgh University Press, 1967). This account has recently been challenged in Roger L. Emerson, "The 'Affair' at Edinburgh and the 'Project' at Glasgow: The Politics of Hume's Attempts to become a Professor," in Hume and Hume's Connexions, edited by M. A. Stewart and John P. Wright (Edinburgh: Edinburgh University Press, 1994), 1-22; and M. A. Stewart, The Kirk and the Infidel (Lancaster: Lancaster University Publications Office, 1995). For historically sensitive contextual analysis of Hume's philosophical relations with Hutcheson, see inter alia James Moore, "Hume and Hutcheson," in Stewart and Wright, 23-57, and M. A. Stewart, Warmth in the Cause of Virtue (Edinburgh: Edinburgh University Press, forthcoming).4. In January 1752, "Mr. Smith read an Account of some of Mr. David Hume's Essays on Commerce" to the Society, and Hume was elected a member in 1753; see Notices and Documents Illustrative of the Literary History of Glasgow, During the Greater Part of Last Century, edited by W. J. Duncan (Glasgow: T. D. Morison, 1886), 132-133. Hume's failed candidacy is discussed in Emerson, "The 'Affair' at Edinburgh," 14-16, and Ian Simpson Ross, The Life of Adam Smith (Oxford: Clarendon Press, 1995), 112-113. Smith's Glasgow colleague from 1751 to 1755, William Cullen, was also sympathetic to Hume's philosophy, as was John Millar, who was elected Professor of Law in 1761. On Cullen and Hume see J.R.R. Christie, "Ether and the Science of Chemistry: 1740-1790," in Conceptions of Ether: Studies in the History of Ether Theories 1740-1900, edited by G. N. Cantor and M.J.S. Hodge (Cambridge: Cambridge University Press, 1981), 90-96.5. David Hume to William Strahan, 26 October 1775, HL II 301.6. See, for example, The Works of Thomas Reid, D.D., edited by Sir William Hamilton, 4th ed. (Edinburgh: Maclachlan and Stewart, 1854), 30n; James McCosh, The Scottish Philosophy, Biographical, Expository, Critical, from Hutcheson to Hamilton (London: Macmillan, 1875), 36; James Veitch, "Philosophy in the Scottish Universities," Mind 2 (1877): 207-234 (209).7. John Rae, Life of Adam Smith (London and New York: Macmillan, 1895); William Robert Scott, Francis Hutcheson: His Life, Teaching and Position in the History of Philosophy (Cambridge: Cambridge University Press, 1900); idem., Adam Smith as Student and Professor (Glasgow: Jackson... (shrink)

In _Matter and Consciousness_, Paul Churchland presents a concise and contemporary overview of the philosophical issues surrounding the mind and explains the main theories and philosophical positions that have been proposed to solve them. Making the case for the relevance of theoretical and experimental results in neuroscience, cognitive science, and artificial intelligence for the philosophy of mind, Churchland reviews current developments in the cognitive sciences and offers a clear and accessible account of the connections to philosophy of mind. For (...) this third edition, the text has been updated and revised throughout. The changes range from references to the iPhone's "Siri" to expanded discussions of the work of such contemporary philosophers as David Chalmers, John Searle, and Thomas Nagel. Churchland describes new research in evolution, genetics, and visual neuroscience, among other areas, arguing that the philosophical significance of these new findings lies in the support they tend to give to the reductive and eliminative versions of materialism. Matter and Consciousness, written by the most distinguished theorist and commentator in the field, offers an authoritative summary and sourcebook for issues in philosophy of mind. It is suitable for use as an introductory undergraduate text. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:"The Fittest Man in the Kingdom":Thomas Reid and the Glasgow Chair of Moral PhilosophyPaul Wood (bio)Paul Wood Paul Wood is at the Department of History, University of Victoria, PO Box 3045, MS 7381, Victoria BC V8W 3P4 Canada. email: [email protected] August 1996Revised January 1997Notes. An earlier version of this paper was delivered at a plenary session of the 23rd International Hume Conference held at the University of (...) Nottingham. For comments and/or references, the author wishes to thank Roger Emerson, Carol Gibson-Wood, Knud Haakonssen, Ian Simpson Ross, Stephen Snobelen, M. A. Stewart, and the anonymous Hume Studies referees. For permission to cite and quote from manuscripts, he is grateful to the Keeper of the Manuscripts of Scotland as well as to the Librarians of Aberdeen University Library, Edinburgh University Library, Glasgow University Archives and Business Records Centre, Glasgow University Library (Department of Special Collections), the Mitchell Library Glasgow, and Dr. Williams' Library.1. Although little information survives regarding Law's teaching, we do know that he discussed Pufendorf in his classes; see Christine Mary King [Shepherd], "Philosophy and Science in the Arts Curriculum of the Scottish Universities in the Seventeenth Century," (Unpublished Ph.D. Dissertation, University of Edinburgh, 1974), 177. Carmichael's edition of Pufendorf first appeared in Glasgow in 1718, and a second edition was published in Edinburgh in 1724 while Hume was still a student there.2. The surviving correspondence between the two men from this period is to be found in The Letters of David Hume, ed. J.Y.T. Greig, 2 vols. (Oxford: Clarendon Press, 1932), I 32-35; 36-40; 45-48 (hereafter abbreviated as HL).3. The first detailed discussion of the 1745 election appeared in the introduction to David Hume, A Letter from a Gentleman to His Friend in Edinburgh, edited by Ernest C. Mossner and John V. Price (Edinburgh: Edinburgh University Press, 1967). This account has recently been challenged in Roger L. Emerson, "The 'Affair' at Edinburgh and the 'Project' at Glasgow: The Politics of Hume's Attempts to become a Professor," in Hume and Hume's Connexions, edited by M. A. Stewart and John P. Wright (Edinburgh: Edinburgh University Press, 1994), 1-22; and M. A. Stewart, The Kirk and the Infidel (Lancaster: Lancaster University Publications Office, 1995). For historically sensitive contextual analysis of Hume's philosophical relations with Hutcheson, see inter alia James Moore, "Hume and Hutcheson," in Stewart and Wright, 23-57, and M. A. Stewart, Warmth in the Cause of Virtue (Edinburgh: Edinburgh University Press, forthcoming).4. In January 1752, "Mr. Smith read an Account of some of Mr. David Hume's Essays on Commerce" to the Society, and Hume was elected a member in 1753; see Notices and Documents Illustrative of the Literary History of Glasgow, During the Greater Part of Last Century, edited by W. J. Duncan (Glasgow: T. D. Morison, 1886), 132-133. Hume's failed candidacy is discussed in Emerson, "The 'Affair' at Edinburgh," 14-16, and Ian Simpson Ross, The Life of Adam Smith (Oxford: Clarendon Press, 1995), 112-113. Smith's Glasgow colleague from 1751 to 1755, William Cullen, was also sympathetic to Hume's philosophy, as was John Millar, who was elected Professor of Law in 1761. On Cullen and Hume see J.R.R. Christie, "Ether and the Science of Chemistry: 1740-1790," in Conceptions of Ether: Studies in the History of Ether Theories 1740-1900, edited by G. N. Cantor and M.J.S. Hodge (Cambridge: Cambridge University Press, 1981), 90-96.5. David Hume to William Strahan, 26 October 1775, HL II 301.6. See, for example, The Works of Thomas Reid, D.D., edited by Sir William Hamilton, 4th ed. (Edinburgh: Maclachlan and Stewart, 1854), 30n; James McCosh, The Scottish Philosophy, Biographical, Expository, Critical, from Hutcheson to Hamilton (London: Macmillan, 1875), 36; James Veitch, "Philosophy in the Scottish Universities," Mind 2 (1877): 207-234 (209).7. John Rae, Life of Adam Smith (London and New York: Macmillan, 1895); William Robert Scott, Francis Hutcheson: His Life, Teaching and Position in the History of Philosophy (Cambridge: Cambridge University Press, 1900); idem., Adam Smith as Student and Professor (Glasgow: Jackson... (shrink)

The doctrine that the character of our perceptual knowledge is plastic, and can vary substantially with the theories embraced by the perceiver, has been criticized in a recent paper by Fodor. His arguments are based on certain experimental facts and theoretical approaches in cognitive psychology. My aim in this paper is threefold: to show that Fodor's views on the impenetrability of perceptual processing do not secure a theory-neutral foundation for knowledge; to show that his views on impenetrability are almost certainly (...) false; and to provide some additional arguments for, and illustrations of, the theoretical character of all observation judgments. (shrink)

In _ Plato's Camera_, eminent philosopher Paul Churchland offers a novel account of how the brain constructs a representation -- or "takes a picture" -- of the universe's timeless categorical and dynamical structure. This construction process, which begins at birth, yields the enduring background conceptual framework with which we will interpret our sensory experience for the rest of our lives. But, as even Plato knew, to make singular perceptual judgments requires that we possess an antecedent framework of abstract categories (...) to which any perceived particular can be relevantly assimilated. How that background framework is assembled in the first place is the motivating mystery, and the primary target, of Churchland's book. Unexpectedly, this neurobiologically grounded account of human cognition also provides a systematic story of how such low-level epistemological activities are integrated within an enveloping framework of linguistic structures and regulatory mechanisms at the social level. As Churchland illustrates, this integration of cognitive mechanisms at several levels has launched the human race on an epistemological adventure denied to all other terrestrial creatures. (shrink)

The present essay is addressed simultaneously to two distinct audiences.

A study in the philosophy of science, proposing a strong form of the doctrine of scientific realism' and developing its implications for issues in the philosophy of mind.

"Churchland and Hooker have collected ten papers by prominent philosophers of science which challenge van Fraassen's thesis from a variety of realist perspectives. Together with van Fraassen's extensive reply... these articles provide a comprehensive picture of the current debate in philosophy of science between realists and anti-realists."—Jeffrey Bub and David MacCallum, Foundations of Physics Letters.

A Neurocomputationial Perspective illustrates the fertility of the concepts and data drawn from the study of the brain and of artificial networks that model the...

In _ Plato's Camera_, eminent philosopher Paul Churchland offers a novel account of how the brain constructs a representation -- or "takes a picture" -- of the universe's timeless categorical and dynamical structure. This construction process, which begins at birth, yields the enduring background conceptual framework with which we will interpret our sensory experience for the rest of our lives. But, as even Plato knew, to make singular perceptual judgments requires that we possess an antecedent framework of abstract categories (...) to which any perceived particular can be relevantly assimilated. How that background framework is assembled in the first place is the motivating mystery, and the primary target, of Churchland's book. Unexpectedly, this neurobiologically grounded account of human cognition also provides a systematic story of how such low-level epistemological activities are integrated within an enveloping framework of linguistic structures and regulatory mechanisms at the social level. As Churchland illustrates, this integration of cognitive mechanisms at several levels has launched the human race on an epistemological adventure denied to all other terrestrial creatures. (shrink)

Churchland explores the unfolding impact of the several empirical sciences of the mind, especially cognitive neurobiology and computational neuroscience on a variety of traditional issues central to the discipline of philosophy. Representing Churchland's most recent research, they continue his research program, launched over thirty years ago which has evolved into the field of neurophilosophy. Topics such as the nature of Consciousness, the nature of cognition and intelligence, the nature of moral knowledge and moral reasoning, neurosemantics or world-representation in the brain, (...) the nature of our subjective sensory qualia and their relation to objective science, and the future of philosophy itself are here addressed in a lively, graphical, and accessible manner. Throughout the volume, Churchland's view that science is as important as philosophy is emphasised. Several of the color figures in the volume will allow the reader to perform some novel phenomenological experiments on his/her own visual system. (shrink)

In this book, Livingston develops the political implications of formal results obtained over the course of the twentieth century in set theory, metalogic, and computational theory. He argues that the results achieved by thinkers such as Cantor, Russell, Godel, Turing, and Cohen, even when they suggest inherent paradoxes and limitations to the structuring capacities of language or symbolic thought, have far-reaching implications for understanding the nature of political communities and their development and transformation. Alain Badiou's analysis of logical-mathematical structures forms (...) the backbone of his comprehensive and provocative theory of ontology, politics, and the possibilities of radical change. Through interpretive readings of Badiou's work as well as the texts of Giorgio Agamben, Jacques Lacan, Jacques Derrida, Gilles Deleuze, and Ludwig Wittgenstein, Livingston develops a formally based taxonomy of critical positions on the nature and structure of political communities. These readings, along with readings of Parmenides and Plato, show how the formal results can transfigure two interrelated and ancient problems of the One and the Many: the problem of the relationship of a Form or Idea to the many of its participants, and the problem of the relationship of a social whole to its many constituents. (shrink)

This collection was prepared in the belief that the most useful and revealing of anyone's writings are often those shorter essays penned in conflict with...

The Hurvich-Jameson (H-J) opponent-process network offers a familiar account of the empirical structure of the phenomenological color space for humans, an account with a number of predictive and explanatory virtues. Its successes form the bulk of the existing reasons for suggesting a strict identity between our various color sensations on the one hand, and our various coding vectors across the color-opponent neurons in our primary visual pathways on the other. But anti-reductionists standardly complain that the systematic parallels discovered by the (...) H-J network are just empirical correspondences, constructed post facto, with no predictive or explanatory purchase on the intrinsic characters of qualia proper. The present paper disputes that complaint, by illustrating that the H-J model yields some novel and unappreciated predictions, and some novel and unappreciated explanations, concerning the qualitative characters of a considerable variety of color sensations possible for human experience, color sensations that normal people have almost certainly never had before, color sensations whose accurate descriptions in ordinary language appear semantically ill-formed or even self-contradictory. Specifically, these "impossible" color sensations are activation-vectors (across our opponent-process neurons) that lie inside the space of neuronally possible activation-vectors, but outside the central 'color spindle' that confines the familiar range of sensations for possible objective colors. These extra-spindle chimerical-color sensations correspond to no reflective color that you will ever see objectively displayed on a physical object. But the H-J model both predicts their existence and explains their highly anomalous qualitative characters in some detail. It also suggests how to produce these rogue sensations by a simple procedure made available in the latter half of this paper. The relevant color plates will allow you to savor these sensations for yourself. (shrink)

For the uninitiated, there are two major tendencies in the modeling of human cognition. The older, tradtional school believes, in essence, that full human cognition can be modeled by dividing the world up into distinct entities -- called __symbol s__-- such as “dog”, “cat”, “run”, “bite”, “happy”, “tumbleweed”, and so on, and then manipulating this vast set of symbols by a very complex and very subtle set of rules. The opposing school claims that this system, while it might be good (...) at concluding that Paris is the capital of France or that there must be blood flowing in the left-rear leg of a cow, can never capture the full measure -- indeed, the essence -- of human cognition. For them, the essential features of cognition emerge from the combined effects of myriad, tiny actions far below the surface of consciousness. This is the camp to which Paul Churchland belongs. (shrink)

The problem of explaining consciousness remains a problem about the meaning of language: the ordinary language of consciousness in which we define and express our sensations, thoughts, dreams and memories. This book argues that the problem arises from a quest that has taken shape over the twentieth century, and that the analysis of history provides new resources for understanding and resolving it. Paul Livingston traces the development of the characteristic practices of analytic philosophy to problems about the relationship of (...) experience to linguistic meaning, focusing on the theories of such philosophers as Carnap, Schlick, Neurath, Husserl, Ryle, Putnam, Fodor and Wittgenstein. Clearly written and avoiding technicalities, this book will be eagerly sought out by professionals and graduate students in philosophy and cognitive science. (shrink)

Paul M. Pietroski presents an ambitious new account of human languages as generative procedures that respect substantive constraints. He argues that meanings are neither concepts nor extensions, and sentences do not have truth conditions; meanings are composable instructions for how to access and assemble concepts of a special sort.

Professor Clark's splendid essay represents a step forward from which there should be no retreat. Ourde factomoral cognition involves a complex and evolving interplay between, on the one hand, thenondiscursive cognitive mechanisms of the biological brain, and, on the other, the often highly discursive extra-personal “scaffolding” that structures the social world in which our brains are normally situated, a world that has been, to a large extent, created by our own moral and political activity. That interplay extends the reach and (...) elevates the quality of the original nondiscursive cognition, and thus any adequate account of moral cognition must address both of these contributing dimensions. An account that focuses only on brain mechanisms will be missing something vital. (shrink)