Mental capacities for perceiving, remembering, thinking, and planning involve the processing of structured mental representations. A compositional semantics of such representations would explain how the content of any given representation is determined by the contents of its constituents and their mode of combination. While many have argued that semantic theories of mental representations would have broad value for understanding the mind, there have been few attempts to develop such theories in a systematic and empirically constrained way. This paper contributes to (...) that end by developing a semantics for a ‘fragment’ of our mental representational system: the visual system’s representations of the bounding contours of objects. At least three distinct kinds of composition are involved in such representations: ‘concatenation’, ‘feature composition’, and ‘contour composition’. I sketch the constraints on and semantics of each of these. This account has three principal payoffs. First, it models a working framework for compositionally ascribing structure and content to perceptual representations, while highlighting core kinds of evidence that bear on such ascriptions. Second, it shows how a compositional semantics of perception can be compatible with holistic, or Gestalt, phenomena, which are often taken to show that the whole percept is ‘other than the sum of its parts’. Finally, the account illuminates the format of a key type of perceptual representation, bringing out the ways in which contour representations exhibit domain-specific form of the sort that is typical of structured icons such as diagrams and maps, in contrast to typical discursive representations of logic and language. (shrink)

I explore the idea of language reaching its limits by distinguishing two kinds of limits language may have: The first are “Boundaries” which lie on the edges of language, and distinguish what makes sense from what does not. These, I claim, are suitable in making theoretical generalizations. The second are “Contours,” which lie within language, and allow for contrasting and comparing meanings and shades of meanings that we capture in language. These are more suitable for characterizations of particulars, and (...) for literary use. I claim that failure to draw this distinction is responsible for confusions in Sabina Lovibond’s and Richard Rorty’s views of moral thought and language. (shrink)

In the Eurowest pain is discursively framed as something that elides discourse and therefore is outside language. In this framing, pain, as outside language, is given asocial and ahistorical status understood to be beyond human construction. Indeed, played out in systems of belief and practice, pain acts as a medium for reciprocal relations with the metaphysical other since it too is understood as originating and sharing a part in the 'authentic' or 'real' from which the metaphysical, and therefore truth, is (...) understood to emerge. Understood as part of this domain, pain is linked to truth and therefore understood to be a means to truth; hence the use of torture to secure the truth. With this kind of discursive framing, this book works to make apparent the rhetorical play of pain demonstrating its social and political imperatives. (shrink)

A simple working taxonomy with three classes of pictorial completion is proposed as an alternative to Pessoa et al.'s classification: area, surface, and contour completion. The classification is based on psychophysical evidence, not on the different phenomenal attributes of the stimuli, showing that pictorial completion is likely to involve mechanistic interactions in the visual system at different levels of processing. Whether the concept of “filling-in” is an appropriate metaphor for the visual mechanisms that may underlie perceptual completion is questioned.

This article introduces an experimental paradigm to selectively probe the multiple levels of visual processing that influence the formation of object contours, perceptual boundaries, and illusory contours. The experiments test the assumption that, to integrate contour information across space and contrast sign, a spatially short-range filtering process that is sensitive to contrast polarity inputs to a spatially long-range grouping process that pools signals from opposite contrast polarities. The stimuli consisted of thin subthreshold lines, flashed upon gaps between collinear (...) inducers which potentially enable the formation of illusory contours. The subthreshold lines were composed of one or more segments with opposite contrast polarities. The polarity nearest to the inducers was varied to differentially excite the short-range filtering process. The experimental results are consistent with neurophysiological evidence for cortical mechanisms of contour processing and with the Boundary Contour System model, which identifies the short-range filtering process with cortical simple cells, and the long-range grouping process with cortical bipole cells. (shrink)

Book Information Contours of Agency: Essays on Themes from Harry Frankfurt. Edited by Sarah Buss and Lee Overton. MIT Press. Cambridge MA. 2002. Pp. 381.

This article discusses the reasons why illusory contours are likely to result from adaptive perceptual mechanisms that have evolved across species to promote behavioral success.

Collinearity or correspondence between the contours of the inducing figure to allow `contour continuation' or `figure completion' were, according to G. Kanizsa, the necessary conditions for producing anomalous surfaces or contours. Since Kanizsa's early work various hypotheses have been advanced to explain the phenomenon, but very few examples of anomalous contours that do not satisfy the above conditions have been reported. When two small white discs (1 cm in diameter) are set on a larger black disc in (...) slow rotation, the two discs, after some observation time, will appear as the extremities of a rigid cylinder displaced in depth. The surface of the cylinder, under dim illumination, appears as a whitish transparent surface. However, when the two discs are substituted by a circle and a semicircle of the same size, a clear anomalous contour appears to form the cylinder, even under clear light conditions and when the colours are reversed; i.e., black circles on white disc. The anomalous contours are not apparent when the configuration is stationary. I will demonstrate how the anomalous contours of a stereokinetic cylinder can be obtained even without the “interruption” of the lines in the semicircle. (shrink)

Heidegger’s thinking should not be labelled rationalist or irrationalist. Because the definitions of rationality and irrationality, which can be seen as derived from Descartes’ or Cartesian philosophy, are deconstructed by Heidegger. The movement of this deconstruction is twofold: at the same time it is a thinking retrieval of the ontologico-historical origin of (Western) thought. The retrieval results in Heidegger’s notion of temporalising Being. This ‘notion’ can also be seen as informed by Nietzsche’s ‘will to power’ and, in turn, to inform (...) its understanding or interpretation itself. (shrink)

Necessarily, if S lacks the ability to exercise control, S is not an agent. If S is not an agent, S cannot act intentionally, responsibly, or rationally, nor can S possess or exercise free will. In spite of the obvious importance of control, however, no general account of control exists. In this paper I reflect on the nature of control itself. I develop accounts of control ’s exercise and control ’s possession that illuminate what it is for degrees of control (...) —that is, the degree of control an agent possesses or exercises in a given circumstance—to vary. Finally, I demonstrate the usefulness of the account on offer by showing how it generates a solution to a long-standing problem for causalist theories of action, namely, the problem of deviant causation. (shrink)

The world of sports today is grappling with dehumanizing tendencies. New technologies are changing sport as we know it, altering the experience of being an athlete in radical ways. These tendencies call for new approaches to sport that consider the human elements of sport. To this end, and as a response to transhumanist and posthumanist arguments, I propose and draw the contours of a humanist theory of sport. I argue that it complements prevailing theories of sport like formalism, broad (...) internalism (or interpretivism), and conventionalism and is better equipped to tackle the pressing concerns of dehumanization in sports. It is rooted in a humanism of embodiment and underscores our corporeal embeddedness in a natural and social world. Taking this into the context of sport, I argue that sport humanism can inform an understanding of sport as a human engagement that involves embodiment, ambiguity, and repetition. On this basis, I outline an ethics of embodiment that can throw new light on moral questions and actions concerning dignity, freedom, and ecology to direct sport toward more sustainable and humane forms of practice. (shrink)

The original essays in this book address Harry Frankfurt's influential writing on personal identity, love, value, moral responsibility, and the freedom and ...

Both the concept of a Darwinian tree of life (TOL) and the possibility of its accurate reconstruction have been much criticized. Criticisms mostly revolve around the extensive occurrence of lateral gene transfer (LGT), instances of uptake of complete organisms to become organelles (with the associated subsequent gene transfer to the nucleus), as well as the implications of more subtle aspects of the biological species concept. Here we argue that none of these criticisms are sufficient to abandon the valuable TOL concept (...) and the biological realities it captures. Especially important is the need to conceptually distinguish between organismal trees and gene trees, which necessitates incorporating insights of widely occurring LGT into modern evolutionary theory. We demonstrate that all criticisms, while based on important new findings, do not invalidate the TOL. After considering the implications of these new insights, we find that the contours of evolution are best represented by a TOL. (shrink)

Results from three experiments using spatial forced-choice techniques show that an illusory contour improves the detectability of a spatially superimposed, 1pixel-thin subthreshold line of either contrast polarity. Furthermore, the subthreshold line is found to enhance the visibility of an illusory contour bridging the gap between the two colinear edges of physically defined boundaries. Stimuli which do not induce illusory contours, but reduce uncertainty about the spatial position of the line, give rise to a slight detection facilitation, but the threshold (...) of 75% correct responses is not attained. The data indicate that superimposing illusory contours and 1pixel thin subthreshold lines produces interactions which are similar to classic subthreshold summation. This provides psychophysical evidence for the functional equivalence of illusory and real lines, as suggested by neurophysiological data from single-cell recordings in V1 and V2 of cats and primates. (shrink)

This is the first chapter to our edited collection of essays on the nature and ethics of blame. In this chapter we introduce the reader to contemporary discussions about blame and its relationship to other issues (e.g. free will and moral responsibility), and we situate the essays in this volume with respect to those discussions.

The pattern of ups and downs in a sequence with varying pitch can be heard as a melodic contour. Contrary to single pitch, the neural representation of melodic contour information in the auditory cortex is rarely investigated, and it is not clear whether the processing entails a hemispheric asymmetry. The present magnetoencephalography study assessed the neuromagnetic responses of N = 18 normal-hearing adults to four-note sequences with fixed vs. varying pitch that were presented either monaurally or diotically; data were analyzed (...) using minimum-norm reconstructions. The first note of the sequences elicited prominent transient activity in posterior auditory regions (Planum temporale), especially contralateral to the ear of entry. In contrast, the response to the subsequent notes originated from more anterior areas (Planum polare) and was larger for melodic contours than for fixed pitch sequences, independent from the ear of entry and without hemispheric asymmetry. Together, the results point to a gradient in the early cortical processing of melodic contours, both in spatial and functional terms, where posterior auditory activity reflects the onset of a pitch sequence and anterior activity reflects its subsequent notes, including the difference between sequences with fixed pitch and melodic contours. (shrink)

The Islamization of Syria, a multi-faceted social and cultural process not limited to demography, was slow and highly variable across different locales. This article analyzes geographical works—ten in Arabic, one in Persian, and one in Hebrew— as well as the earliest Ottoman defters of the province to outline the process of Islamization in Syria from the Islamic conquest in the seventh century to the Ottoman conquest in the sixteenth. Geographical texts cannot be mined as databases, but when interpreted as literature (...) they provide often detailed information regarding the foundation of mosques, the slow conversion of multi-religious shrines, and areas within Syria known for particular religious affiliations. (shrink)

McKillop explores the thought of a number of English-Canadian thinkers from the 1860s to the 1920s, decades that saw Canada’s entry into the modern age.

RESUMEN Algunos textos de Abelardo, Tomás de Aquino, Llull y el Cusano, no solo muestran una forma específicamente medieval de encarar la diversidad interreligiosa, sino aun algo más, a saber, que las apreciables diferencias políticas y epistémicas que separan al medioevo de la modernidad no implican que la tolerancia sea una noción propiamente moderna, ni que su versión medieval resulte ajena a cierta admisión de la libertad religiosa y de la pluralidad en la verdad. ABSTRACT The examination of texts by (...) Abelard, Thomas Aquinas, Llull, and Nicholas of Cusa shows that they do not merely reflect a specifically medieval way of addressing interreligious diversity. Rather, it shows that the significant political and epistemic differences separating the Middle Ages from Modernity do not imply that tolerance is a specifically modern concept, and that the medieval version of tolerance allows for a certain degree of religious freedom and pluralism regarding truth. RESUMO Alguns textos de Abelardo, Tomás de Aquino, Llull e Nicolau de Cusa não somente mostram uma forma especificamente medieval de encarar a diversidade inter-religiosa, mas também algo mais: as apreciáveis diferenças políticas e epistêmicas que separam a Idade Média da Modernidade não implicam que a tolerância seja uma noção propriamente moderna, nem que sua versão medieval acabe sendo alheia a certa admissão da liberdade religiosa e da pluralidade na verdade. (shrink)

This article contemplates symbols and values inscribed on Cairo’s landscape during the 2011 revolution and the period since, focusing on Tahrir Square and the role of the Egyptian flag in street discourses there. I start by briefly pondering how intertwined popular narratives readied the square and flag as emblems of dissent. Next I examine how these appropriations shaped protests in the square, and how military authorities who retook control in 2013 re-coopted the square and flag, with the reabsorption of each (...) critical to that of the other and executed in the same place: Tahrir. Pro-military factions have created the pretense that they were for the revolution by altering the square and structures around it. Furthermore, the square has remained open to the public, but ceased to be inviting. This relates to post-revolutionary alterations that psychologically repel entry. I consider these changes in light of affordance theory, value sensitive design research and especially the defensible space model, arguing that Tahrir Square has been symbolically cordoned and closed. (shrink)