The thresholds of human observers detecting line targets improve significantly when the targets are presented in a spatial context of collinear inducing stimuli. This phenomenon is referred to as spatial facilitation, and may reflect the output of long-range interactions between cortical feature detectors. Spatial facilitation has thus far been observed with luminance-defined, achromatic stimuli on achromatic backgrounds. This study compares spatial facilitation with line targets and collinear, edge-like inducers defined by luminance contrast to spatial facilitation with targets and (...) inducers defined by color contrast. The results of a first experiment show that achromatic inducers facilitate the detection of achromatic targets on gray and colored backgrounds, but tend to suppress the detection of chromatic targets. Chromatic inducers facilitate the detection of chromatic targets on gray and colored backgrounds, but tend to suppress the detection of achromatic targets. Chromatic spatial facilitation appears to be strongest when inducers and background are isoluminant. The results of a second experiment show that spatial facilitation with chromatic targets and inducers requires a longer exposure duration of the inducers than spatial facilitation with achromatic targets and inducers, which is already fully effective at an inducer exposure of 30 ms only. The findings point towards two separate mechanisms for spatial facilitation with collinear form stimuli: one that operates in the domain of luminance, and one that operates in the domain of color contrast. These results are consistent with neural models of boundary and surface formation which suggest that achromatic and chromatic visual cues are represented on different cortical surface representations that are capable of selectively attracting attention. Multiple copies of these achromatic and chromatic surface representations exist corresponding to different ranges of perceived depth from an observer, and each can attract attention to itself. Color and contrast differences between inducing and test stimuli, and transient responses to inducing stimuli, can cause attention to shift across these surface representations in ways that sometimes enhance and sometimes interfere with target detection. (shrink)

A detection task was performed using different pictographic representations of objects in order to test the hypothesis that high-level information (familiarity) may influence detection thresholds. The stimuli were five versions of forms: outline drawings of objects, silhouettes, and three fragmented versions of forms derived from the outlines. The stimuli varied on two parameters: their nameability (easily nameable, hardly nameable, and not nameable) as assessed by a naming task, and their energy content as assessed by a two-dimensional fast-Fourier transform. The greatest (...) amount of energy was observed for silhouettes, and the amount of energy contained in the vertical and horizontal spatial frequency components was equivalent for outlines and the three versions of fragmented forms. Luminance thresholds for the detection of the forms were measured by means of an adaptive method. The results show that thresholds were determined only by the energy content of the stimuli. High-level semantic or name information had no influence on the detectability of the visual signal. The results are discussed in terms of the visibility of spatial frequency components at detection threshold. (shrink)

The main focus of this special issue is on marginality, a multifaceted concept that requires a cross-disciplinary approach. The papers selected here deal with marginality in the formation of the epistemic canon (?the mainstream?) and the production of knowledge in the humanities and social sciences. By employing the vocabulary of marginality (?marginal,? ?margins,? ?luminal,? ?threshold,? as well as dichotomies such as ?minor-major,? ?center-periphery?), we propose a shift from a discussion of the canon in terms of just one category of (...) ?marginals? (a certain race, class, gender etc.) to considering this complex concept in terms of a plurality of players and factors related to marginality broadly defined, some of which have little or nothing to do with power structures and dichotomies. Marginality is thus conceived of as an epistemic category and not as a power status. (shrink)

Brincat and Westheimer [Journal of Neurophysiology 83 (2000) 1900] have reported facilitating interactions in the discrimination of spatially separated target orientations and co-linear inducing orientations by human observers. With smaller gaps between stimuli (short-range effects), facilitating interactions were found to depend on the contrast polarity of the stimuli. With larger gaps (longrange effects), only co-linearity of the stimuli seemed necessary to produce facilitation. In our study, the dependency of facilitating interactions on the intensity (luminance) of line stimuli is investigated (...) by measuring detection thresholds for a target line separated from the end of an inducing line by co-axial gaps ranging from 5 to 200 min of visual arc. We find facilitating interactions between target and inducing orientations, producing short-range and long-range effects similar to those reported by Brincat and Westheimer. In addition, detection thresholds as a function of the co-axial separation between target and inducing line reveal an interaction between the spatial regime of facilitating effects and the luminance of the stimuli. Short-range effects are found to be sensitive to changes in local intensity while long-range effects remain unaffected. (shrink)

Using Finsler brane solutions [see details and methods in: S. Vacaru, Class. Quant. Grav. 28:215001, 2011], we show that neutrinos may surpass the speed of light in vacuum which can be explained by trapping effects from gravity theories on eight dimensional (co) tangent bundles on Lorentzian manifolds to spacetimes in general and special relativity. In nonholonomic variables, the bulk gravity is described by Finsler modifications depending on velocity/momentum coordinates. Possible super-luminal phenomena are determined by the width of locally anisotropic brane (...) (spacetime) and induced by generating functions and integration functions and constants in coefficients of metrics and nonlinear connections. We conclude that Finsler brane gravity trapping mechanism may explain neutrino super-luminal effects and almost preserve the paradigm of Einstein relativity as the standard one for particle physics and gravity. (shrink)

Application of egalitarian and prioritarian accounts of health resource allocation in low‐income countries have both been criticized for implying distribution outcomes that allow decreasing/undermining health gains and for tolerating unacceptable standards of health care and health status that result from such allocation schemes. Insufficient health care and severe deprivation of health resources are difficult to accept even when justified by aggregative efficiency or legitimized by fair deliberative process in pursuing equality and priority oriented outcomes. I affirm the sufficientarian argument that, (...) given extreme scarcity of public health resources in low‐income countries, neither health status equality between populations nor priority for the worse off is normatively adequate. Nevertheless, the threshold norm alone need not be the sole consideration when a country's total health budget is extremely scarce. Threshold considerations are necessary in developing a theory of fair distribution of health resources that is sensitive to the lexically prior norm of sufficiency. Based on the intuition that shares must not be taken away from those who barely achieve a minimal level of health, I argue that assessments based on standards of minimal physical/mental health must be developed to evaluate the sufficiency of the total resources of health systems in low‐income countries prior to pursuing equality, priority, and efficiency based resource allocation. I also begin to examine how threshold sensitive health resource assessment could be used in the Philippines. (shrink)

Timothy Williamson has recently argued that few mental states are luminous , meaning that to be in that state is to be in a position to know that you are in the state. His argument rests on the plausible principle that beliefs only count as knowledge if they are safely true. That is, any belief that could easily have been false is not a piece of knowledge. I argue that the form of the safety rule Williamson uses is inappropriate, and (...) the correct safety rule might not conflict with luminosity. (shrink)

The Threshold of the Visible World advances a revolutionary new political aesthetic--Kaja Silverman explores the possibilities for looking beyond the restrictive mandates of the self, and the normative aspects of the cultural image-repertoire. She provides a detailed account of the social and psychic forces which constrain us to look and identify in normative ways, and the violence which that normativity implies. Accounting for these phenomena on both a conscious and an unconcious level, Silverman analyzes the psychic and textual conditions (...) under which our "field of vision" can be expanded. The title of this book is taken from Lacan's essay on the mirror stage. In that text, Lacan writes that "the mirror-image would seem to be the threshold of the visible world." He thereby suggests that the visible world has no existence as such until the infant subject has access to an image of self. Lacan intimates that the mirror provides the frame through which one relates to others within the domain of vision, stressing the priority of narcissism and the ego over all other libidinal transactions. The Threshold of the Visible World provides a psychic, social and political specification of Lacan's claim, and most particularly of its implications for the subject's relations to the social other. This is accomplished through examination of the ego, as well as two other categories at the center of Lacan's account of the mirror stage: ideality and identification. This book is an ethical-political project which leads to the re-elaboration of a number of crucial theoretical categories--Silverman offers an account of the bodily ego, of identification, of idealization, of the gaze, of the look, and of the "photographic." The Threshold of the Visible World leads as well to the formulation of a fresh model for conceptualizing sexual, racial and class "difference," and the terms under which it might be dismantled. This book thus seeks to apprehend the field of vision through the frame of a different kind of bodily ego, and discover the pleasures to be derived from corporeal transport. (shrink)

Despite the prominence of thresholds in theories of distributive justice, there is no general account of what sort of role is played by the idea of a threshold within such theories. This has allowed an ongoing lack of clarity and misunderstanding around views that employ thresholds. In this article, I develop an account of the concept of thresholds in distributive justice. I argue that this concept contains three elements, which threshold views deploy when ranking possible distributions. These elements (...) are (i) the level of the threshold, (ii) what constitutes the value of the threshold, and (iii) how benefits above and below the threshold must be allocated. I highlight three contributions that this particular account of thresholds makes: it clarifies the nature of the shift that occurs at the threshold; it resolves a common misunderstanding about headcount principles; and it shows how the arbitrariness objection can be met. (shrink)

In this paper I argue that there is no viable alternative to construing our knowledge and justified belief as resting on a foundation restricted to truths about our internal states. Against Williamson and others I defend the claim that the internal life of a cognizer really does constitute a special sort of cognitive home that is importantly different from the rest of what we think we know and justifiably believe.

Mental-threshold egalitarianism, well-known examples of which include Jeff McMahan’s two-tiered account of the wrongness of killing and Tom Regan’s theory of animal rights, divides morally considerable beings into equals and unequals on the basis of their individual mental capacities. In this paper, I argue that the line that separates equals from unequals is unavoidably arbitrary and implausibly associates an insignificant difference in empirical reality with a momentous difference in moral status. In response to these objections, McMahan has proposed the (...) introduction of an intermediate moral status. I argue that this move ultimately fails to address the problem. I conclude that, if we are not prepared to give up moral equality, our full and equal moral status must be grounded in a binary property that is not a threshold property. I tentatively suggest that the capacity for phenomenal consciousness is such a property, and a plausible candidate. (shrink)

If you believe that there are restrictions on what we as moral agents can do to others, but that these restrictions can give way in the face of competing considerations, then you believe in thresholds for rights. In this dissertation I develop an account of thresholds for rights, in defence of a position which is often stated but rarely explained or defended. I begin with the obvious question: How much needs to be at stake before a right's claim is overridden? (...) ;Less obvious, but equally crucial, are questions about the distribution of the total which needs to be at stake. After developing a framework for answering that question, in subsequent chapters I deal with other factors which may influence our judgements about the overridability of rights' claims, including the numbers and identities of the agents involved. (shrink)

_Threshold Concepts in Problem-based Learning_ provides a critical discussion and guidance for educational researchers, teachers, innovators and policy makers wanting to explore the interrelationship of PBL and threshold concepts.

The threshold law for N-body fragmentation under dipole forces is formulated. It emerges from the energy dependence of the normalization of the correlated continuum wave function for N fragments. It is shown that the dipole threshold law plays a key role in understanding all threshold fragmentation phenomena since it links the classical threshold law for long-range Coulomb interactions to the statistical law for short-range interactions. Furthermore, a tunnelling mechanism is identified as the common feature which occurs (...) for all three classes of interactions, short-range, dipole and Coulomb. (shrink)

"In Yoga and the Luminous, a book that emerges from more than thirty years of practice, study, and reflection, Christopher Key Chapple addresses the need for an ...

Awakening the Luminous Mind is the third book of guided meditation practices in a series by the acclaimed author and teacher, Tenzin Wangyal Rinpoche. Tenzin Rinpoche will guide you to bring these simple practices into your everyday life by turning inward and finding what he calls your "inner refuge." By this he means boundless space, infinite awareness, and the qualities that arise that have the power to transform your life. As you follow the principles in this book and complimentary CD, (...) you will discover greater creativity and intelligence, liberation from suffering, understanding and connectivity, and freedom from the ego that strives to control our life experiences. (shrink)

The continuity thesis of the Poznań school threshold model of the growth of scientific knowledge is considered in the light of the example of Van der Waals' and Boyle-Mariotte's laws. It is argued - using both traditional logical means and the structuralist reconstruction of the example - that the continuity thesis does not hold. A distinction between 'a historical and a systematic point of view' is introduced and it is argued that the continuity thesis of the threshold model (...) presupposes the systematic point of view. However, looking at matters from the systematic point of view need not yield the original theory, looked at from the historical point of view. Applied to the case of Van der Waals/Boyle-Mariotte laws, it turns out that the latter law is not a true idealizing special case of the former, contrary to the continuity thesis. The structuralist analysis of the example indicates that Boyle-Mariotte's law is a false factual law from the historical point of view. However, viewed from the systematic point of view, Boyle-Mariotte's law turns out to be a law which is expandable, adding the relevant new concepts, to an idealized version of Van der Waals' law. This idealizing version of Van der Waal's law in turn is a structuralist specialization of the (general) Van der Waals' law. (shrink)

Despite the prominence of thresholds and limits in theories of distributive justice, there is no general account of their role within such theories. This has allowed an ongoing lack of clarity and misunderstanding around threshold views in distributive justice. In this thesis, I develop an account of the conceptual structure of such views. Such an account helps understand and characterize threshold views, can subsume what may seem to be different debates about such views under one conceptual header, and (...) can be used to further examine and develop patterns of justice that draw on thresholds. In light of this account, I propose a novel characterization of sufficientarianism which sheds new light on the distinctiveness of sufficientarianism as a distributive principle and on the common objections to sufficientarianism. Moreover, I examine and defend limitarianism, which is the view that people should not have more than a certain amount of wealth. In particular, I argue in favour of limitarianism as a midlevel principle for guiding institutional design and individual actions and, furthermore, as a specification of what a just allocation of wealth requires under epistemic constraints. (shrink)

While genomic and proteomic information describe the overall cellular machinery available to an organism, the metabolic profile of an individual at a given time provides a canvas as to the current physiological state. Concentration levels of relevant metabolites vary under different conditions, in particular, in the presence or absence of different disorders. Metabolite concentrations thus mediate an important link between chemistry and biology, contributing to a systems-wide understanding of biological processes and pathways. However, there are a number of challenges in (...) the ontological representation of such information. Firstly, concentration information is numeric and ranges over continuous values, while ontologies consist of discrete classes. Secondly, ontologies usually model only what is certain, and their logical formalisms are adapted to reasoning from certain axioms to logical deductions, however, the link between chemicals and diseases via concentration levels, like many threshold phenomena, is both uncertain and vague. In this paper we evaluate the representation of this knowledge using a combination of concrete domains and probabilistic reasoning. We parse concentration values from HMDB and create an ontology able to distinguish normal from abnormal concentrations and able to evaluate a probabilistic risk category for the presence of an associated disorder. (shrink)

Categorical perception (CP) is said to occur when a continuum of equally spaced physical changes is perceived as unequally spaced as a function of category membership (Harnad, S. (Ed.) (1987). Psychophysical and cognitive aspects of categorical perception: A critical overview. Cambridge: Cambridge University Press). A common suggestion is that CP for color arises because perception is qualitatively distorted when we learn to categorize a dimension. Contrary to this view, we here report that English speakers show no evidence of lowered discrimination (...) thresholds at the boundaries between blue and green categories even though CP is found at these boundaries in a supra-threshold task. Furthermore, there is no evidence of different discrimination thresholds between individuals from two language groups (English and Korean) who use different color terminology in the blue-green region and have different supra-threshold boundaries. Our participants' just noticeable difference (JND) thresholds suggest that they retain a smooth continuum of perceptual space that is not warped by stretching at category boundaries or by within-category compression. At least for the domain of color, categorical perception appears to be a categorical, but not a perceptual phenomenon. (shrink)

This article and associated short film, entitled Threshold, explores the phenomenon of house as a Cartesian construct of rational cultural detachment, set in binary opposition to the indigenous understanding of nature as connected and sacred. Threshold focuses on the liminal in-between zones of a house – its doors and windows – which both separate and join the inside/outside domains – without belonging to either of them. The film explores the liminal act of crossing this ontological threshold – (...) representing it cinematically as a vibrational, ocular/aural wavering between two ‘worlds’. The intention is to destabilize this duality on an emotional level – in order to interrogate its validity. This strategy references anthropological theory, which asserts that the liminal act stimulates the limbic system containing ancestral, instinctual deposits. The function of the limbic system (part of the triune brain model) accords with Jung’s theory of the collective unconscious – which views the house as an archetypal symbol, central to the meaning of dreams – in representing the psyche of the dreamer. Threshold attempts to invoke this and other archaic symbols as the camera journeys through its interior spaces, discovering its material culture artefacts, which reflect the psychic state of its inhabitants. The paper explores the indigenous belief that there is a mystical (unitive, transformative) relationship existing between space and acoustics that can only be fully appreciated through an emotional experience with it. The adoption of an arts interventionist approach, can, the article will argue, provide an important contribution towards our expanded understanding of Space and Place as an embodied, emotional-cognitive act. (shrink)

The threshold problem is the task of adequately answering the question: “Where does the threshold lie between knowledge and lack thereof?” I start this paper by articulating two conditions for solving it. The first is that the threshold be neither too high nor too low; the second is that the threshold accommodate the significance of knowledge. In addition to explaining these conditions, I also argue that it is plausible that they can be met. Next, I argue (...) that many popular accounts of knowledge cannot meet them. In particular, I lay out a number of problems that standard accounts of knowledge face in trying to meet these conditions. Finally, near the end of this paper, I argue that there is one sort of account that seems to evade these problems. This sort of account, which is called a cluster account of knowledge, says that knowledge is to be accounted for in terms of truth, belief and a cluster of epistemic properties and also that knowledge doesn’t require having all members of the cluster, but merely some subset. (shrink)

Passive Brain-Computer interfaces (pBCIs) are a human-computer communication tool where the computer can detect from neurophysiological signals the current mental or emotional state of the user. The system can then adjust itself to guide the user towards a desired state. One challenge facing developers of pBCIs is that the system's parameters are generally set at the onset of the interaction and remain stable throughout, not adapting to potential changes over time such as fatigue. The goal of this paper is to (...) investigate the improvement of pBCIs with settings adjusted according to the information provided by a second neurophysiological signal. With the use of a second signal, making the system a hybrid pBCI, those parameters can be continuously adjusted with dynamic thresholding to respond to variations such as fatigue or learning. In this experiment, we hypothesize that the adaptive system with dynamic thresholding will improve perceived game experience and objective game performance compared to two other conditions: an adaptive system with single primary signal biocybernetic loop and a control non-adaptive game. A within-subject experiment was conducted with 16 participants using three versions of the game Tetris. Each participant plays 15 minutes of Tetris under three experimental conditions. The control condition is the traditional game of Tetris with a progressive increase in speed. The second condition is a cognitive load only biocybernetic loop with the parameters presented in Ewing et al. (2016). The third condition is our proposed biocybernetic loop using dynamic threshold selection. Electroencephalography was used as the primary signal and automatic facial expression analysis as the secondary signal. Our results show that, contrary to our expectations, the adaptive systems did not improve the participants' experience as participants had more negative affect from the BCI conditions than in the control condition. We endeavored to develop a system that improved upon the authentic version of the Tetris game, however, our proposed adaptive system neither improved players’ perceived experience, nor their objective performance. Nevertheless, this experience can inform developers of hybrid passive BCIs on a novel way to employ various neurophysiological features simultaneously. (shrink)

In sensory biology, a major outstanding question is how sensory receptor cells minimize noise while maximizing signal to set the detection threshold. This optimization could be problematic because the origin of both the signals and the limiting noise in most sensory systems is believed to lie in stimulus transduction. Signal processing in receptor cells can improve the signal‐to‐noise ratio. However, neural circuits can further optimize the detection threshold by pooling signals from sensory receptor cells and processing them using (...) a combination of linear and nonlinear filtering mechanisms. In the visual system, noise limiting light detection has been assumed to arise from stimulus transduction in rod photoreceptors. In this context, the evolutionary optimization of the signal‐to‐noise ratio in the retina has proven critical in allowing visual sensitivity to approach the limits set by the quantal nature of light. Here, we discuss how noise in the mammalian retina is mitigated to allow for highly sensitive night vision. (shrink)

Shared intentionality is key for understanding human cooperation and cognition. This paper proposes a new way of looking at shared intentionality as a set of interconnected threshold traits, highlighting the role of developmental niche construction in its evolution. This perspective suggests that shared intentionality may have arisen from environmental changes and interactions influencing existing traits, rather than genetic variation for novel cognitive machinery.

In “Constitutivism without Normative Thresholds,” Kathryn Lindeman raises two objections to what she aptly calls Threshold Constitutivism. My aim in this short discussion is to respond to her first objection. Although I will argue that this objection fails, I will also argue that thinking through how to respond to it reminds us of something important, namely, that many of the Norm-Governed Kinds that are directly related to intentional action are social kinds, that is, kinds whose existence conditions we ourselves (...) collectively write. Everyone, whether constitutivist or not, needs to think seriously about what those existence conditions should be. [1] Journal of Ethics and Social Policy 12 (3): 231-258 (2017). [2] Lindeman’s second objection depends on her view, which I do not share, that “Normative Constitutivism has ambitions to be an explanatory strategy for norms in general” (238, my emphasis). (shrink)

This essay represents a serious but fictional obituary of a scientific concept called the Threshold Dose–Response Model, which has long dominated the fields of toxicology and the broader biomedical sciences. Recent evidence indicates that the Threshold Dose–Response Model has long outlived its utility to predict low‐dose effects. In fact, so poorly does this model predict low‐dose responses that the idea arose that it should receive a symbolic burial recounting its achievements and failings, hence this obituary. BioEssays 29:686–688, 2007. (...) © 2007 Wiley Periodicals, Inc. (shrink)

Suárez’s primary attempt to rethink angelology can be found in the De Angelis. This work is a mighty commentary on the prima pars of Aquinas’ Summa Theologiae (qq. 50-64) which Suárez left to his colleagues after his years in Coimbra (1597-1607), and which was published posthumously in Lyon in 1620. The composition of the text is somewhat stratified and it includes many references to the Disputationes Metaphysicae, but Suárez most likely already started writing it during his years of teaching in (...) Spain and Italy (1575-1597), before 1597. Because of its Thomistic inspiration, the De angelis is a fundamentally theological and doctrinal work, the metaphysical core of which is independently treated in the DM 35, entitled De immateriali substantia creata. In this passage, which is eminently theoretical, Suárez grapples with the most important quaestiones concerning angels under a metaphysical point of view, therein offering one of the most interesting overviews of early modern angelology. In this paper, I will refer especially to the DM 35, a more synthetic and peculiar work, with some reference to De Angelis as well. I will focus especially on sections 1-3 of DM 35, and try to reconstruct Suárez’s views on the following points: a) the cosmological necessity of angels, their rational demonstrability and the possibility of man’s knowing them (sections 1-2); b) the immaterial essence of angels (section 3). (shrink)

This essay tries to demonstrate two distinct but complementary visions to a central theme of Christian faith: humanity’s redemption in the crucified Christ. It will attempt to show how the poetics of Simone Weil (1909–1943) and the poetic art of Georges Rouault (1871–1943) embody different understandings of Christian faith. Considering faith from a philosophical approach, Weil detaches the sufferings of Christ from the totality of salvific history. Viewing faith from the artistic approach, Rouault places the crucified Christ in the context (...) of the history of salvation, including Mary and the Church. Though different from one another, these two visions reveal to us a light in the midst of our dark or suffering existence that makes audible or perceptible the silence of God’s love in Christ that is its source. (shrink)

In this paper I shall argue that Tim Williamson’s argument for the anti-luminosity of many mental states faces difficult logical, psychological and epistemological problems. From a logical point of view, his argument is correct. However, the contrary argument that says that the anti-luminosity thesis does not necessarily follow from it is also correct. This opens a sceptical scenario. Hence, if Williamson wants to convince us that we should rationally prefer his argument rather than the other, he needs to add considerations (...) that are not merely logical. These are psychological and epistemological in nature. However, none of these considerations is convincing. (shrink)

Matthias Joseph Scheeben has been described as one of the greatest and least read theologians of the modern era. This article provides an overview of his theology of predestination, which remains a significant but little-studied aspect of his thought. Section I offers a general sketch of Scheeben's theology of predestination, employing the chapter on this topic in The Mysteries of Christianity as a primary source. Section II takes a deeper look at Scheeben's theology of predestination through an engagement with relevant (...) sections of his untranslated masterwork, the Dogmatik. This section will highlight Scheeben's relationship to both the de auxiliis controversy and the thought of Thomas Aquinas. Connections between Scheeben's theology of predestination and his other theological positions are noted throughout. (shrink)

A dynamic threshold, which controls the nature and course of learning, is a pivotal concept in Page's general localist framework. This commentary addresses various issues surrounding biologically plausible implementations for such thresholds. Relevant previous research is noted and the particular difficulties relating to the creation of so-called instance representations are highlighted. It is stressed that these issues also apply to distributed models.

Touching on Nancy and Derrida offers a glimpse not only into the thesis both of Jean-Luc Nancy's critique of touch and of Derrida's Le Toucher, but also into the threshold of a technology of (the) sense to come. This glimpse is an interrogation, and one that is both historic and historical, in the sense that Derrida, in addressing Jean-Luc Nancy's work, has presented us with an encyclopedic history of touch in the philosophic tradition from Aristotle to Nancy, one in (...) which what Derrida calls “transcendental archifacticity” is accorded its proper value, and within which any seeming anthropological privilege, as an inherent aspect of the Phenomenological Reduction is, as Derrida says, ‘overshadowed.’ Such an overshadowing is both strategic, in terms of a historical phenomenological project, and tactical, in Derrida's investigative sense: tactical in terms of implementation, manifestation, manipulation (i.e. through the application of the hand, manus) and in terms of tact, tactility; to which must be tacked on, à la Nancy, con-tact, ‘with touch,’ a ‘with-touch’ in which a béance, a gash or dash, opens out in-between, ‘at the very point’ to use Derrida's repeated specification, of bifurcation and of con-tact, at the junction point of the ‘spacing out’ of a laminated différance con-noting more than it has or had ever done in Derrida's work itself. *. (shrink)

Since its appearance over a decade ago, Timothy Williamson's anti-luminosity argument has come under sustained attack. Defenders of the luminous overwhelmingly object to the argument's use of a certain margin-for-error premise. Williamson himself claims that the premise follows easily from a safety condition on knowledge together with his description of the thought experiment. But luminists argue that this is not so: the margin-for-error premise either requires an implausible interpretation of the safety requirement on knowledge, or it requires other equally implausible (...) assumptions. In this paper I bolster the margin-for-error premise against these attacks by recasting Williamson's own two-part defence, the first part intended to work on the assumption that there is no constitutive connection between the phenomenal and the doxastic, and the second intended to work without this assumption. Pace various luminists, I argue that the appeals to safety needed for Williamson's two-part defence are plausible. I also argue that all that is needed to generate the margin-for-error premise from these safety conditions is an empirical assumption about the kinds of creatures we are: that is, creatures whose beliefs are structured by certain dispositions. By recasting the anti-luminosity argument in this way, we can understand what is really at stake in the debate about luminosity: that is, whether we are luminous. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Philosophy and Rhetoric 33.4 (2000) 303-318 [Access article in PDF] The Threshold of the Self Bradford Vivian The subject has a history. Classical Greek sculpture expressed a fascination with the formal beauty of one's self. Ever gazing outward or upward, the marble figures symbolized the Greek preoccupation with a boldness of being, a constant focus on the ideals of the body and mind, which, through their pursuit, might (...) allow one a foretaste of heaven. Centuries later, as the pagan symbols of the ancient world were replaced with those of the growing Byzantine Empire, blocks of the same marble were fashioned into very different expressions. The ideals of form made manifest in the smooth, taught lines and surfaces of classical Greek sculpture were supplanted by Byzantine art's attention to the less perfect details of the individual: distinctive and common faces, beards, clothing, and less glorified bodies. The gazes of the Byzantine statues were cast down, contemplative, reflecting Byzantium's early Christian emphasis upon the modesty of human existence, the pious appraisal of one's time on Earth. Each of these sculptural styles is a material way of thinking and expressing one's being in the world. In this context, each is also symptomatic of the conditions in which such being was possible.The subject must not be conceived as a transcendent entity. Quite to the contrary, there is a historicity to our being and its expression, to our subjectivity and its elaboration. Within a more sweeping perspective, our epochal narratives of the subject--as well as the modes of thought and speech by which we make sense of ourselves--change with each passing age.At the forefront of the current era is a manifold effort to rethink and elaborate anew the concept of the subject. Feminist scholars have initiated political critique and transformation by arguing that the very notion of a subject in Western discourse has functioned as a trope of masculine privilege cloaked in the language of equality and secular humanism. 1 Postmodernists, of course, define contemporary subjectivity as de-centered and fragmented by nature (e.g., Baudrillard 1994; Latour 1993; Lyotard 1984). And [End Page 303] a variety of interdisciplinary studies illuminate the role of modern science and technology in not only sustaining our being, but actually constituting the human; in short, our daily interdependence and union with artificial body parts, synthetic products, life-support machines, test-tube reproduction, computers, and more, characterizes the arrival of what has been called "the posthuman." 2 Like ancient marble from a quarry, however, all of these materials are sculpted in historically specific ways to simultaneously think and express our subjectivity.What role might rhetoric play in this re-imagining of subjectivity? Modern Western thought has defined the subject according to content--that is, by the nature of the essence or being the subject is said to possess. Drawn around this content, the subject comes to appear enclosed, perhaps autonomous, and identical to itself. In this essay, however, I argue that the self may be conceived as a form--a rhetorical form--that exists only in its continual aesthetic creation, in its indefinite becoming. The self is, by this account, isomorphic with the threshold out of which it is composed. Such a formulation makes the self open to difference, to continual movement and transformation, instead of identical to itself.I aim in this essay to explore the abstract rhetorical forms and functions out of which the self is composed. The distinction here amounts to no longer asking, "What is a subject?" but, "What conditions and forces enable the ongoing production of the self?" Commensurate with such a proposal, it will be essential to ask how this movement--this continual becoming--of the self is brought about. The answer to this question ultimately will amplify the role of rhetoric in, not simply expressing, but actually producing conditions of being. In what follows, I begin by reviewing the very general aspects of subjectivity that I wish to call into question. Thereafter, I explore how the subject might be conceived differently. Finally, I discuss the manner in which rhetoric may... (shrink)