Results for 'Birgitta Dresp-Langley'

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  1. 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 effects of attentional (...)
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  2. Phenomena of Illusory Form: Can We Bridge the Gap Between Levels of Explanation?Lothar Spillmann & Birgitta Dresp - 1995 - Perception 24:1333-1364.
    The major theoretical framework relative to the perception of illusory figures is reviewed and discussed in the attempt to provide a unifying explanatory account for these phenomena.
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  3. Depth Perception From Pairs of Overlapping Cues in Pictorial Displays.Birgitta Dresp, Severine Durand & Stephen Grossberg - 2002 - Spatial Visions 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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  4. Apparent Brightness Enhancement in the Kanizsa Square with and Without Illusory Contours.Birgitta Dresp & Jean Lorenceau - 1990 - Perception 19:483-489.
    The perceived strength of darkness enhancement in the centre of surfaces surrounded or not surrounded by illusory contours was investigated as a function of proximity of the constituent elements of the display and their angular size. Magnitude estimation was used to measure the perception of the darkness phenomenon in white-on-grey stimuli. Darkness enhancement was perceived in both types of the stimuli used, but more strongly in the presence of illusory contours. In both cases, perceived darkness enhancement increased with increasing proximity (...)
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  5. On Illusory Contours and Their Functional Significance.Birgitta Dresp - 1997 - Current Psychology of Cognition 16:489-518.
    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.
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  6. Psychophysical Evidence for Low-Level Processing of Illusory Contours and Surfaces in the Kanizsa Square.Birgitta Dresp & Claude Bonnet - 1991 - Vision Research 31:1813-1817.
    Light increment thresholds were measured on either side of one of the illusory contours of a white-on-black Kanizsa square and on the illusory contour itself. The data show that thresholds are elevated when measured on either side of the illusory border. These elevations diminish with increasing distance of the target spot from the white elements which induce the illusory figure. The most striking result, however, is that threshold elevations are considerably lower or even absent when the target is located on (...)
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  7. A Plastic Temporal Brain Code for Conscious State Generation.Birgitta Dresp & Jean Durup - 2009 - Neural Plasticity 2009:1-15.
    Consciousness is known to be limited in processing capacity and often described in terms of a unique processing stream across a single dimension: time. In this paper, we discuss a purely temporal pattern code, functionally decoupled from spatial signals, for conscious state generation in the brain. Arguments in favour of such a code include Dehaene et al.’s long-distance reverberation postulate, Ramachandran’s remapping hypothesis, evidence for a temporal coherence index and coincidence detectors, and Grossberg’s Adaptive Resonance Theory. A time-bin resonance model (...)
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  8. Psychophysical Measures of Illusory Form: Further Evidence for Local Mechanisms.Birgitta Dresp & Claude Bonnet - 1993 - Vision Research 33:759-766.
    Detection thresholds for a small light spot were measured at various distances from the colinear inucer edges of white inducing elements on a dark background. The data show that thresholds are elevated when the target is located close to one or more inducing element(s). Threshold elevations diminish with increasing distance of the target from colinear edges and decreasing surface size of the inducing elements. gradients show the same tendencies. Tbe present observations add empirical support to the idea that illusory figures (...)
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  9.  87
    Seven Properties of Self-Organization in the Human Brain.Birgitta Dresp-Langley - 2020 - Big Data and Cognitive Computing 2 (4):10.
    The principle of self-organization has acquired a fundamental significance in the newly emerging field of computational philosophy. Self-organizing systems have been described in various domains in science and philosophy including physics, neuroscience, biology and medicine, ecology, and sociology. While system architecture and their general purpose may depend on domain-specific concepts and definitions, there are (at least) seven key properties of self-organization clearly identified in brain systems: 1) modular connectivity, 2) unsupervised learning, 3) adaptive ability, 4) functional resiliency, 5) functional plasticity, (...)
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  10. 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 remained (...)
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  11.  49
    Bilateral Symmetry Strengthens the Perceptual Salience of Figure Against Ground.Birgitta Dresp-Langley - 2019 - Symmetry 2 (11):225-250.
    Although symmetry has been discussed in terms of a major law of perceptual organization since the early conceptual efforts of the Gestalt school (Wertheimer, Metzger, Koffka and others), the first quantitative measurements testing for effects of symmetry on processes of Gestalt formation have seen the day only recently. In this study, a psychophysical rating study and a “foreground”-“background” choice response time experiment were run with human observers to test for effects of bilateral symmetry on the perceived strength of figure-ground in (...)
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  12. 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 a (...)
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  13. Does Consciousness Exist Independently of Present Time and Present Time Independently of Consciousness.Birgitta Dresp-Langley & Jean Durup - 2012 - Open Journal of Philosophy 2 (1):45-49.
    While some are currently debating whether time may or may not be an illusion, others keep devoting their time to the science of consciousness. Time as such may be seen as a physical or a subjective variable, and the limitations in our capacity of perceiving and analyzing temporal order and change in physical events definitely constrain our understanding of consciousness which, in return, constrains our conceptual under-standing of time. Temporal codes generated in the brain have been considered as the key (...)
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  14. Colour for Behavioural Success.Birgitta Dresp-Langley - 2018 - I-Perception 2 (9):1-23.
    Colour information not only helps sustain the survival of animal species by guiding sexual selection and foraging behaviour but also is an important factor in the cultural and technological development of our own species. This is illustrated by examples from the visual arts and from state-of-the-art imaging technology, where the strategic use of colour has become a powerful tool for guiding the planning and execution of interventional procedures. The functional role of colour information in terms of its potential benefits to (...)
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  15. Color and Figure-Ground: From Signals to Qualia.Birgitta Dresp-Langley & Adam Reeves (eds.) - 2014 - Routledge.
    The laws which predict how the perceptual quality of figure-ground can be extracted from the most elementary visual signals were discovered by the Gestaltists, and form an essential part of their movement (see especially Metzger, 1930, and Wertheimer, 1923 translated and re-edited by Lothar Spillmann, 2009 and 2012, respectively). Distinguishing figure from ground is a prerequisite for perception of both form and space (the relative positions, trajectories, and distances of objects in the visual field. The human brain has an astonishing (...)
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  16. The Communication Contract and Its Ten Ground Clauses.Birgitta Dresp-Langley - 2008 - Journal of Business Ethics 87 (3):415-436.
    Global society issues are putting increasing pressure on both small and large organizations to communicate ethically at all levels. Achieving this requires social skills beyond the choice of language or vocabulary and relies above all on individual social responsibility. Arguments from social contract philosophy and speech act theory lead to consider a communication contract that identifies the necessary individual skills for ethical communication on the basis of a limited number of explicit clauses. These latter are pragmatically binding for all partners (...)
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  17. Affine Geometry, Visual Sensation, and Preference for Symmetry of Things in a Thing.Birgitta Dresp-Langley - 2016 - Symmetry 127 (8).
    Evolution and geometry generate complexity in similar ways. Evolution drives natural selection while geometry may capture the logic of this selection and express it visually, in terms of specific generic properties representing some kind of advantage. Geometry is ideally suited for expressing the logic of evolutionary selection for symmetry, which is found in the shape curves of vein systems and other natural objects such as leaves, cell membranes, or tunnel systems built by ants. The topology and geometry of symmetry is (...)
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  18. On Galileo's Visions: Piercing the Spheres of the Heavens by Eye and Mind.Birgitta Dresp-Langley - 2014 - Perception 43:1280-1282.
    This bookreview discusses Piccolino and Wades' book on Galileo's impact on contemporary perception science.
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  19. Visual Spatial Learning of Complex Object Structures Through Virtual and Real-World Data.Chiara Silvestri, Rene Motro, Bernard Maurin & Birgitta Dresp-Langley - 2010 - Design Studies 31:364-380.
    This article probes the visual spatial représentations underlying the creative conceptual design of complex objects.
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  20. Beyond the Classic Receptive Field: The Effect of Contextual Stimuli.Lothar Spillmann, Birgitta Dresp-Langley & Chia-Huei Tseng - 2015 - Journal of Vision 15:1-22.
    Following the pioneering studies of the receptive field (RF), the concept gained further significance for visual perception by the discovery of input effects from beyond the classical RF. These studies demonstrated that neuronal responses could be modulated by stimuli outside their RFs, consistent with the perception of induced brightness, color, orientation, and motion. Lesion scotomata are similarly modulated perceptually from the surround by RFs that have migrated from the interior to the outer edge of the scotoma and in this way (...)
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  21. Why the Brain Knows More Than We Do.Birgitta Dresp-Langley - 2011 - Brain Sciences 2:1-21.
    Scientific studies have shown that non-conscious stimuli and représentations influence information processing during conscious experience. In the light of such evidence, questions about potential functional links between non-conscious brain representations and conscious experience arise. This article discusses models capable of explaining how statistical learning mechanisms in dedicated resonant circuits could generate specific temporal activity traces of non-conscious representations in the brain. How reentrant signaling, top-down matching, and statistical coincidence of such activity traces may lead to the progressive consolidation of neural (...)
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  22. 2D Geometry Predicts Perceived Visual Curvature in Context-Free Viewing.Birgitta Dresp-Langley - 2015 - Computational Intelligence and Neuroscience 2015 (708759):1-9.
    Planar geometry was exploited for the computation of symmetric visual curves in the image plane, with consistent variations in local parameters such as sagitta, chordlength, and the curves’ height-to-width ratio, an indicator of the visual area covered by the curve, also called aspect ratio. Image representations of single curves (no local image context) were presented to human observers to measure their visual sensation of curvature magnitude elicited by a given curve. Nonlinear regression analysis was performed on both the individual and (...)
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  23.  88
    AISC 17 Talk: The Explanatory Problems of Deep Learning in Artificial Intelligence and Computational Cognitive Science: Two Possible Research Agendas.Antonio Lieto - 2018 - In Proceedings of AISC 2017.
    Endowing artificial systems with explanatory capacities about the reasons guiding their decisions, represents a crucial challenge and research objective in the current fields of Artificial Intelligence (AI) and Computational Cognitive Science [Langley et al., 2017]. Current mainstream AI systems, in fact, despite the enormous progresses reached in specific tasks, mostly fail to provide a transparent account of the reasons determining their behavior (both in cases of a successful or unsuccessful output). This is due to the fact that the classical problem (...)
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  24. Dynamic Characteristics of Spatial Mechanisms Coding Contour Structures. 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 the (...)
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