Results for 'luminance'

46 found
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  1. Luminous margins.Brian Weatherson - 2004 - Australasian Journal of Philosophy 82 (3):373 – 383.
    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 (...)
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  2. Is ~ K ~ KP a luminous condition?Martin Smith - 2022 - Asian Journal of Philosophy 1 (1):1-10.
    One of the most intriguing claims in Sven Rosenkranz’s Justification as Ignorance is that Timothy Williamson’s celebrated anti-luminosity argument can be resisted when it comes to the condition ~K~KP—the condition that one is in no position to know that one is in no position to know P. In this paper, I critically assess this claim.
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  3. What is the Wonder of All Wonders? The Unfolding Awareness... Luminous Flesh.Rudolph Bauer - 2012 - Transmission 1.
    This paper focuses on the unfolding of awareness as embodiment of luminous spaceousness.
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  4. The Luminous Kundalini as the Expanding Luminous Field of Awareness Bring Forth Sublimation.PhD Rudolph Bauer, Rudolph Bauer - 2012 - Transmission 1 (Awareness).
    This paper focuses on the natural unfolding of the kundalini energy which is the expansion of the energy of awareness within the body.
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  5. Phenomenal properties are luminous properties.Geoffrey Hall - 2021 - Synthese 199 (3-4):11001-11022.
    What is the connection between having a phenomenal property and knowing that one has that property? A traditional view on the matter takes the connection to be quite intimate. Whenever one has a phenomenal property, one knows that one does. Recently most authors have denied this traditional view. The goal of this paper is to defend the traditional view. In fact, I will defend something much stronger: I will argue that what it is for a property to be phenomenal is (...)
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  6. Proclus on Place as the Luminous Vehicle of the Soul.Michael J. Griffin - 2012 - Dionysius 30:161-186.
    Proclus argues that place (topos) is a body of light, identified as the luminous vehicle of the soul, which mediates between soul and body and facilitates motion. Simplicius (in Phys. 611,10–13) suggests that this theory is original to Proclus, and unique in describing light as a body. This paper focuses on the function of this theory as a bridge between Proclus’ physics and metaphysics, allowing the Aristotelian physical notion of “natural place” to serve as a mechanism for the descent and (...)
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  7. Spatial facilitation by color and luminance edges: boundary, surface, and attentional factors.Birgitta Dresp & Stephen Grossberg - 1995 - Vision Research 39 (20):3431-3443.
    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 (...)
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  8. Asymmetrical contrast effects induced by luminance and color configurations.Birgitta Dresp-Langley & Stéphane Fischer - 2001 - Perception and Psychophysics 63 (7):1262-1270.
    In psychophysical experiments, the use of a psychophysical procedure of brightness/darkness cancellation shed light on interactions between spatial arrangement and figure–ground contrast in the perceptual filling in of achromatic and colored surfaces.Achromatic and chromatic Kanizsa squares with varying contrast, contrast polarity, and inducer spacingwere used to test how these factors interact in the perceptual filling in of surface brightness or darkness. The results suggest that the neuronal processing of surfaces with apparent contrast, leading to figure–ground segregation (i.e., perceptual organization), is (...)
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  9. Seminar on the Fragmenting Body and the freeing of Luminous Spaciousness to be Embodied.Rudolph Bauer - 2012 - Transmission 2.
    This paper beginning with a Lacanian view point describes fragmentation and the unfolding of awareness in the process of embodiment within the understanding of dzogchen.
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  10. Interaction of color and geometric cues in depth perception: When does red mean "near"?Christophe Guibal & Birgitta Dresp - 2004 - Psychological Research 69:30-40.
    Luminance and color are strong and self-sufficient cues to pictorial depth in visual scenes and images. The present study investigates the conditions Under which luminance or color either strengthens or overrides geometric depth cues. We investigated how luminance contrasts associated with color contrast interact with relative height in the visual field, partial occlusion, and interposition in determining the probability that a given figure is perceived as ‘‘nearer’’ than another. Latencies of ‘‘near’’ responses were analyzed to test for (...)
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  11. Effects of saturation and contrast polarity on the figure-ground organization of color on gray.Birgitta Dresp-Langley & Adam Reeves - 2014 - Frontiers in Psychology 5:1-9.
    Poorly saturated colors are closer to a pure grey than strongly saturated ones and, therefore, appear less “colorful”. Color saturation is effectively manipulated in the visual arts for balancing conflicting sensations and moods and for inducing the perception of relative distance in the pictorial plane. While perceptual science has proven quite clearly that the luminance contrast of any hue acts as a self-sufficient cue to relative depth in visual images, the role of color saturation in such figure-ground organization has (...)
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  12. Color for the perceptual organization of the pictorial plane: Victor Vasarely's legacy to Gestalt psychology.Birgitta Dresp-Langley & Adam Reeves - 2020 - Heliyon 6 (6):e04375.
    Victor Vasarely's (1906–1997) important legacy to the study of human perception is brought to the forefront and discussed. A large part of his impressive work conveys the appearance of striking three-dimensional shapes and structures in a large-scale pictorial plane. Current perception science explains such effects by invoking brain mechanisms for the processing of monocular (2D) depth cues. Here in this study, we illustrate and explain local effects of 2D color and contrast cues on the perceptual organization in terms of figure-ground (...)
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  13. Losing Confidence in Luminosity.Simon Goldstein & Daniel Waxman - 2020 - Noûs (4):1-30.
    A mental state is luminous if, whenever an agent is in that state, they are in a position to know that they are. Following Timothy Williamson’s Knowledge and Its Limits, a wave of recent work has explored whether there are any non-trivial luminous mental states. A version of Williamson’s anti-luminosity appeals to a safety- theoretic principle connecting knowledge and confidence: if an agent knows p, then p is true in any nearby scenario where she has a similar level of confidence (...)
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  14. Competition for consciousness among visual events: The psychophysics of reentrant visual processes.Vincent Di Lollo, James T. Enns & Ronald A. Rensink - 2000 - Journal Of Experimental Psychology-General 129 (4):481-507.
    Advances in neuroscience implicate reentrant signaling as the predominant form of communication between brain areas. This principle was used in a series of masking experiments that defy explanation by feed-forward theories. The masking occurs when a brief display of target plus mask is continued with the mask alone. Two masking processes were found: an early process affected by physical factors such as adapting luminance and a later process affected by attentional factors such as set size. This later process is (...)
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  15. Luminosity Regained.Selim Berker - 2008 - Philosophers' Imprint 8:1-22.
    The linchpin of Williamson (2000)'s radically externalist epistemological program is an argument for the claim that no non-trivial condition is luminous—that no non-trivial condition is such that whenever it obtains, one is in a position to know that it obtains. I argue that Williamson's anti-luminosity argument succeeds only if one assumes that, even in the limit of ideal reflection, the obtaining of the condition in question and one's beliefs about that condition can be radically disjoint from one another. However, no (...)
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  16. Practical Knowledge without Luminosity.Bob Beddor & Carlotta Pavese - 2021 - Mind 131 (523):917-934.
    According to a rich tradition in philosophy of action, intentional action requires practical knowledge: someone who acts intentionally knows what they are doing while they are doing it. Piñeros Glasscock argues that an anti-luminosity argument, of the sort developed in Williamson, can be readily adapted to provide a reductio of an epistemic condition on intentional action. This paper undertakes a rescue mission on behalf of an epistemic condition on intentional action. We formulate and defend a version of an epistemic condition (...)
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  17. Picture changes during blinks: Looking without seeing and seeing without looking.J. Kevin O'Regan, H. Deubel, James J. Clark & Ronald A. Rensink - 2000 - Visual Cognition 7:191-211.
    Observers inspected normal, high quality color displays of everyday visual scenes while their eye movements were recorded. A large display change occurred each time an eye blink occurred. Display changes could either involve "Central Interest" or "Marginal Interest" locations, as determined from descriptions obtained from independent judges in a prior pilot experiment. Visual salience, as determined by luminance, color, and position of the Central and Marginal interest changes were equalized. -/- The results obtained were very similar to those obtained (...)
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  18. Luminosity in the stream of consciousness.David Jenkins - 2018 - Synthese 198 (Suppl 7):1549-1562.
    Williamson’s “anti-luminosity” argument aims to establish that there are no significant luminous conditions. “Far from forming a cognitive home”, luminous conditions are mere “curiosities”. Even supposing Williamson’s argument succeeds in showing that there are no significant luminous states his conclusion has not thereby been established. When it comes to determining what is luminous, mental events and processes are among the best candidates. It is events and processes, after all, which constitute the stream of consciousness. Judgment, for instance, is plausibly self-conscious. (...)
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  19. Free Progress Education.Marco Masi - 2017 - Indy Edition.
    Schools, colleges, and universities have become homogenizing systems that are almost exclusively focused on imposing a pre-ordered curricula through exams and grades or tight research lines. In the process, they are killing passion, creativity, and individuals’ potential and skills. Ultimately, schools and academia make up a system that serves a collective machinery but suffocates individual growth. This state of affairs is not a necessary evil. Learning, discovering and teaching can be a natural, spontaneous and luminous expressions of a free and (...)
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  20. How to Know That You’re Not a Zombie.Brentyn J. Ramm - 2024 - Erkenntnis:1-22.
    I am aware of the tree and its leaves, but am I aware of my awareness of these things? When I try to introspect my awareness, I just find myself attending to objects and their properties. This observation is known as the ‘transparency of experience’. On the other hand, I seem to directly know that I am aware. Given the first observation, it is not clear how I know that I am aware. Fred Dretske thought that the problem was so (...)
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  21. Discrimination and Self-Knowledge.Patrick Greenough - 2012 - In Declan Smithies & Daniel Stoljar (eds.), Introspection and Consciousness. Oxford University Press.
    In this paper I show that a variety of Cartesian Conceptions of the mental are unworkable. In particular, I offer a much weaker conception of limited discrimination than the one advanced by Williamson (2000) and show that this weaker conception, together with some plausible background assumptions, is not only able to undermine the claim that our core mental states are luminous (roughly: if one is in such a state then one is in a position to know that one is) but (...)
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  22. Simultaneous brightness and apparent depth from true colors on grey: Chevreul revisited.Birgitta Dresp-Langley & Adam Reeves - 2012 - Seeing and Perceiving 25 (6):597-618.
    We show that true colors as defined by Chevreul (1839) produce unsuspected simultaneous brightness induction effects on their immediate grey backgrounds when these are placed on a darker (black) general background surrounding two spatially separated configurations. Assimilation and apparent contrast may occur in one and the same stimulus display. We examined the possible link between these effects and the perceived depth of the color patterns which induce them as a function of their luminance contrast. Patterns of square-shaped inducers of (...)
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  23. A self-consistent opponent-colors theory.Tal Hendel - manuscript
    Hering’s opponent-colors theory suggests that our color sensations are produced by three mechanisms: a red–green mechanism, a yellow–blue mechanism, and a white–black mechanism. The first two mechanisms give rise to our sensations of hued colors; the third mechanism gives rise to our sensations of hueless colors. Noticeably, whereas the pair of colors produced by each of the hued mechanisms do not mix to yield a phenomenal intermediate (i.e., there are no greenish reds, reddish greens, yellowish blues, or bluish yellows), the (...)
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  24. Consciousness and the End of Materialism: Seeking identity and harmony in a dark era.Spyridon Kakos - 2018 - International Journal of Theology, Philosophy and Science 2 (2):17-33.
    “I am me”, but what does this mean? For centuries humans identified themselves as conscious beings with free will, beings that are important in the cosmos they live in. However, modern science has been trying to reduce us into unimportant pawns in a cold universe and diminish our sense of consciousness into a mere illusion generated by lifeless matter. Our identity in the cosmos is nothing more than a deception and all the scientific evidence seem to support this idea. Or (...)
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  25. Filled/non-filled pairs: An empirical challenge to the integrated information theory of consciousness.Amber R. Hopkins & Kelvin J. McQueen - 2022 - Consciousness and Cognition 97 (C):103245.
    Perceptual filling-in for vision is the insertion of visual properties (e.g., color, contour, luminance, or motion) into one’s visual field, when those properties have no corresponding retinal input. This paper introduces and provides preliminary empirical support for filled/non-filled pairs, pairs of images that appear identical, yet differ by amount of filling-in. It is argued that such image pairs are important to the experimental testing of theories of consciousness. We review recent experimental research and conclude that filling-in involves brain activity (...)
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  26. Phenomenal qualities and the development of perceptual integration.Mariann Hudak, Zoltan Jakab & Ilona Kovacs - 2013 - In Liliana Albertazzi (ed.), The Wiley-Blackwell Handbook of Experimental Phenomenology; Visual Perception of Shape, Space and Appearance. Wiley-Blackwell.
    In this chapter, data concerning the development of principal aspects of vision is reviewed. First, the development of colour vision and luminance perception is discussed. Relevant data accumulated so far indicates that perception of colour and luminance is present by 6-9 months of age. The presence of typical color illusions at this age suggests that the phenomenal character of color experience is comparable to that of adults well before the first birthday. Thus it seems plausible that color perception (...)
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  27. The influence of cast shadows on visual search.Ronald A. Rensink & Patrick Cavanagh - 2004 - Perception 33:1339-1358.
    We show that cast shadows can have a significant influence on the speed of visual search. In particular, we find that search based on the shape of a region is affected when the region is darker than the background and corresponds to a shadow formed by lighting from above. Results support the proposal that an early-level system rapidly identifies regions as shadows and then discounts them, making their shapes more difficult to access. Several constraints used by this system are mapped (...)
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  28. Inside, and Beyond „Nothingness”.Klein Adrian - 2022 - Cunoașterea Științifică 1 (1):37-43.
    A brief introduction to the subquantum regime, where the origination of all the observable events and processes of tour physical world can be found. Descending along the scale supplied by the divisibility of Quanta toward increasingly fine structures bearing fractional charges, down to the infinitesimal values where Information couples to space and time, we penetrate into a new, still barely explored reality, which nonetheless is supported by the laws of modern physics. We just begin understanding the properties of the physical (...)
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  29. Radiance of Time.Gus Koehler - manuscript
    For Vajrayana Buddhism, the now is an interval, a boundary, a point of tension and suspension with an atmosphere of uncertainty. It is a bifurcation point of variable length; its name is “bardo.” The bardo is immersed in the conventional, or “seeming” reality. It emerges from what is called the “unstained” ultimate or primordial emptiness or “basal clear light.” Further, the ultimate is not the sphere of cognition. Cognition, including cognition of time, belongs to conventional reality. Buddhahood, in contrast, is (...)
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  30. Knowing How One Knows.Giovanni Rolla - 2019 - Logos and Episteme 10 (2):195-205.
    In this paper, I argue that knowledge is dimly luminous. That is: if a person knows that p, she knows how she knows that p. The argument depends on a safety-based account of propositional knowledge, which is salient in Williamson’s critique of the ‘KK’ principle. I combine that account with non-intellectualism about knowledge-how – according to which, if a person knows how to φ, then in nearly all (if not all) nearby possible worlds in which she φes in the same (...)
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  31. Divine Emanation as Cosmic Origin: Ibn Sīnā and His Critics.Syamsuddin Arif - 2012 - TSAQAFAH - Journal of Islamic Thought and Civilization 8 (2):331-346.
    The question of cosmic beginning has always attracted considerable attention from serious thinkers past and present. Among many contesting theories that have emerged, that of emanation was appropriated by Muslim philosophers like Ibn Sînâ in order to reconcile the Aristotelian doctrine of the eternity of matter with the teaching of al-Qur’ân on the One Creator-God. According to this theory, the universe, which comprises a multitude of entities, is generated from a transcendent Being, the One, that is unitary, through the medium (...)
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  32. New Treatie on the use and reform of understanding.Victor Mota - manuscript
    following Spinoza an, somewhat, Locke, trough a luminous path of a unique philosophical adventure.
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  33. Sixth Force and Photonic Overman.Hermes Varini - 2020 - Society. Communication. Education Peter the Great St. Petersburg Polytechnic University 2020 (1):29.
    In contrast to the Nietzschean conception of Übermensch as signifying, hitherto, a supermanhood in moral terms alone, the principle of the latter lies in its being antithetical to the present human status, and in its thus proving altogether superior both ontologically and physically. With this premise the notions of Sixth Force and Photonic Frame are now associated. Set forth after a qualitative fashion, while the former is related to the thus far known elemental constituents of matter, as well as to (...)
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  34. Disjunctive luminosity.Drew Johnson - 2021 - Thought: A Journal of Philosophy 10 (2):118-126.
    Williamson's influential anti-luminosity argument aims to show that our own mental states are not “luminous,” and that we are thus “cognitively homeless.” Among other things, this argument represents a significant challenge to the idea that we enjoy basic self-knowledge of our own occurrent mental states. In this paper, I summarize Williamson's anti-luminosity argument, and discuss the role that the notion of “epistemic basis” plays in it. I argue that the anti-luminosity argument relies upon a particular version of the basis-relative safety (...)
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  35. Heidegger’s Question of Being: The Unity of Topos and Logos.Axel Onur Karamercan - 2023 - Sophia 1:1-17.
    In this article, I elucidate the significance of Heidegger’s ‘question of being’ from a topological point of view by explaining the relationship between his thought of place and language. After exploring various hermeneutic strategies of reading Heidegger’s oeuvre, I turn to Richard Capobianco’s interpretation of Heidegger and critically engage with his idea of the experience of being itself as the ‘luminous selfshowing of logos’. In doing so, I explain the later turn from ‘truth’ to ‘place’ and articulate why logos needs (...)
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  36. Mad Speculation and Absolute Inhumanism: Lovecraft, Ligotti, and the Weirding of Philosophy.Ben Woodard - 2011 - Continent 1 (1):3-13.
    continent. 1.1 : 3-13. / 0/ – Introduction I want to propose, as a trajectory into the philosophically weird, an absurd theoretical claim and pursue it, or perhaps more accurately, construct it as I point to it, collecting the ground work behind me like the Perpetual Train from China Mieville's Iron Council which puts down track as it moves reclaiming it along the way. The strange trajectory is the following: Kant's critical philosophy and much of continental philosophy which has followed, (...)
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  37. Plotinus’s conception of unity and multiplicity as the root to the medieval distinction between lux and lumen.Yael Raizman-Kedar - 2006 - Studies in History and Philosophy of Science Part A 37 (3):379-397.
    Plotinus resolved the paradox of the immanent transcendence, characterizing the relation between the One and the universe, through his theory of the two energeiai. According to this doctrine, all existents have an internal activity and an external activity: the internal activity comprises the true essence and substance of each being; the external activity is emitted outwards as its image. The source of the emission is thus present in the lower layer of being by virtue of its manifold images. The prominence (...)
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  38. Die Idee der Verwandlung.Andreas Dorschel - 2007 - In Verwandlungsmusik. Über komponierte Transfigurationen. Universal Edition. pp. 11-51.
    Within the European history of ideas, at least three conceptions of metamorphosis can be distinguished. First, as celebrated in Ovid’s Metamorphoses, there is the vision of an open-ended flux of shapes in all directions, potentially with the ambiguous result of wavering identity. Secondly, at the centre of the synoptic gospels Jesus’s transfiguration is presented as a luminous elevation, rendering his true nature unambiguous. Thirdly, alchemy conceives of metamorphosis as contingent upon a meeting of polarities. The distinction is fit to disclose (...)
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  39. Visual features as carriers of abstract quantitative information.Ronald A. Rensink - 2022 - Journal of Experimental Psychology: General 8 (151):1793-1820.
    Four experiments investigated the extent to which abstract quantitative information can be conveyed by basic visual features. This was done by asking observers to estimate and discriminate Pearson correlation in graphical representations where the first data dimension of each element was encoded by its horizontal position, and the second by the value of one of its visual features; perceiving correlation then requires combining the information in the two encodings via a common abstract representation. Four visual features were examined: luminance, (...)
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  40. Estabelecimento da Gestação nos Animais.Emanuel Isaque Cordeiro da Silva - manuscript
    OBJETIVO A gestação nos mamíferos domésticos é um processo fisiológico que implica mudanças físicas, metabólicas e hormonais na fêmea, que culminam com o nascimento de um novo indivíduo. Desta forma, a compreensão de tais mudanças e como estas favorecem um ambiente ideal de desenvolvimento embrionário inicial, até a placentação e a fisiologia envolvidas durante esses processos é fundamental na tomada de decisões quanto à saúde reprodutiva da fêmea, na seleção de futuras matrizes e até mesmo para a saúde fetal e (...)
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  41. Short- and long-range effects in line contrast integration.Birgitta Dresp-Langley - 2002 - Vision Research 42:2493-2498.
    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 (...)
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  42. Dynamic characteristics of spatial mechanisms coding contour structures.Birgitta Dresp - 1999 - Spatial Vision 12:29-42.
    Spatial facilitation has been observed with luminance-defined, achromatic stimuli on achromatic backgrounds as well as with targets and inducers defined by colour contrast. This paper reviews psychophysical results from detection experiments with human observers showing the conditions under which spatially separated contour inducers facilitate the detection of simultaneously presented target stimuli. The findings point towards two types of spatial mechanisms: (i) Short-range mechanisms that are sensitive to narrowly spaced stimuli of small size and, at distinct target locations, selective to (...)
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  43. Scrutiny of Einstein’s Causality.Mohamed Elmansour Hassani - manuscript
    In the present paper, the so-called Einstein’s causality is scrutinized and proven to be an illusion, a sort of mathematical fiction, and the causality as a well-established universal principle would be absolutely valid for subluminal, luminal and superluminal signals under any natural and/or artificial circumstances. It is also shown that any attempt to apply special relativity theory to superluminality of physical phenomena would be a complete waste of time since this theory has the light speed in vacuum as an upper (...)
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  44. Review of Lorraine Daston & Katharine Park, Wonders and the Order of Nature, 1150-1750. [REVIEW]John Sutton - 1999 - Times Literary Supplement 5001.
    Curious about the nature of light, Robert Boyle spent a series of late nights taking detailed observations of shining veal shanks, stinking fish, pieces of rotten wood which glowed in the dark, and a ‘noctiluca’ distilled from human urine. Once, report Lorraine Daston and Katharine Park, with "only a foot-boy" to assist him, Boyle put a luminous diamond to the nocturnal test, "plunging it into oil and acid, spitting on it, and ‘taking it into bed with me, and holding it (...)
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  45.  66
    A real eye opener. La fotografía de Vivian Maier.Pablo Pavesi - 2017 - Boletín de Estética 13 (40):61-75.
    Vivian Maier’s street photography shows us a sudden transfiguration of reality, by which persons, scenes and things become faerical (neologism that also receives one of the senses of the French féerie , a play where supernatural, or, in this case, also infranatural creatures appear). We propose that this transfiguration is an apparition – a faerical epiphany (always earthy and fleshy) that follows two ways, one sunny and luminous, the other obscure and subterranean. We will examine Maier’s body, reflected in her (...)
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  46. Depth perception from pairs of overlapping cues in pictorial displays.Birgitta Dresp, Severine Durand & Stephen Grossberg - 2002 - Spatial Vision 15:255-276.
    The experiments reported herein probe the visual cortical mechanisms that control near–far percepts in response to two-dimensional stimuli. Figural contrast is found to be a principal factor for the emergence of percepts of near versus far in pictorial stimuli, especially when stimulus duration is brief. Pictorial factors such as interposition (Experiment 1) and partial occlusion Experiments 2 and 3) may cooperate, as generally predicted by cue combination models, or compete with contrast factors in the manner predicted by the FACADE model. (...)
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