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All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year Sort by creator [A → Z]' creator [Z → A]' publishing year ↑ (asc)' publishing year ↓ (desc)' title [A → Z]' title [Z → A]' Simple Search Hits 1 – 12 of 12 1 Computing in the face of uncertainty : from neurons to behavior Pouget, Alexandre; Rao, Vikranth Bejjanki (1982 - ). - : University of Rochester, 2011 Abstract: Thesis (Ph. D.)--University of Rochester. Dept. of Brain and Cognitive Sciences, 2010. ; What are the computational mechanisms that underlie perceptual and cognitive behavior? Any answer to this question must start with the observation that the brain has to work with uncertain information at every level of analysis. The presence of uncertainty has the consequence that the problem of computation in the brain becomes one of probabilistic inference. Indeed, we can recast all cognitive processing as comprising sequential stages of probabilistic inference, performed over data of varying abstraction. In this framework, the goal of processing at a particular level is to infer the variable of interest given the input information and the goal of learning at a particular level is to improve the quality of the inference that is being carried out. In this thesis we explore and computationally characterize the inference that underlies cognitive processing at multiple levels, using multiple research methodologies. At the neural level, we derive a simple analytic expression that allows for the relation of network properties to the quality of the inference being carried out during neural representation and transmission. This derivation provides an important tool that can be used to elucidate mechanisms leading to efficient inference. We then use this expression to explore the neural mechanisms that underlie the improvements in behavioral performance, observed during perceptual learning. We report that perceptual learning can be neurally mediated through an improvement in the inference process in early sensory areas. Importantly, this model, in addition to accounting for the training induced changes in behavioral performance, also captures the training induced changes in neural properties. Finally, at the behavioral level, we show that human multi-sensory integration during categorical speech perception is well described by a normative model for optimal inference, thereby providing behavioral evidence for efficient inference in the brain. As opposed to previous studies, the study described here computationally and experimentally probes cue integration in categorical tasks, thereby representing an important extension of previous work since most real-world perceptual tasks involve judgments over categorical dimensions. Keyword: Fisher information; Multi-sensory integration; Perceptual learning; Speech perception URL: http://hdl.handle.net/1802/9602 BASE Hide details 2 Bayesian brain : probabilistic approaches to neural coding Doya, Kenji; Ishii, Shin; Pouget, Alexandre. - Cambridge, Mass. : MIT Press, 2007 MPI für Psycholinguistik Show details 3 Population codes Pouget, Alexandre; Zemel, Richard S. In: Bayesian brain (Cambridge, Mass., 2007), p. 113-130 MPI für Psycholinguistik Show details 4 Computing with population codes Latham, Peter E.; Pouget, Alexandre In: Bayesian brain (Cambridge, Mass., 2007), p. 131-144 MPI für Psycholinguistik Show details 5 A computational neural theory of multisensory spatial representations Pouget, Alexandre; Deneve, Sophie; Duhamel, Jean-René In: Crossmodal space and crossmodal attention (Oxford, 2004), p. 123-140 MPI für Psycholinguistik Show details 6 Multisensory spatial representations in eye-centered coordinates for reaching Pouget, Alexandre; Ducom, Jean-Christophe; Torri, Jeffrey... In: Cognition. - Amsterdam [u.a] : Elsevier 83 (2002) 1, B1 OLC Linguistik Show details 7 Multisensory spatial representations in eye-centered coordinates for reaching Pouget, Alexandre; Ducom, Jean-Christophe; Torri, Jeffrey... In: Cognition. - Amsterdam [u.a] : Elsevier 83 (2002) 1, B1-B11 BLLDB Show details 8 Simulating a lesion in a basis function model of spatial representations : comparison with hemineglect Pouget, Alexandre; Sejnowski, Terrence J. In: Psychological review. - Washington, DC [u.a.] : American Psychological Association 108 (2001) 3, 653-673 BLLDB Show details 9 A new view of hemineglect based on the response properties of parietal neurones Pouget, Alexandre; Sejnowski, Terrence J. In: The hippocampal and parietal foundations of spatial cognition (Oxford [etc.], 1999), p. 127-148 MPI für Psycholinguistik Show details 10 Probabilistic interpretation of population codes Zemel, Richard S.; Dayan, Peter; Pouget, Alexandre In: Neural codes and distributed representations (Cambridge, MA [etc.], 1999), p. 139-166 MPI für Psycholinguistik Show details 11 Statistically efficient estimation using population coding Pouget, Alexandre; Zhang, Kechen; Deneve, Sophie... In: Neural codes and distributed representations (Cambridge, MA [etc.], 1999), p. 55-84 MPI für Psycholinguistik Show details 12 Egocentric Spatial Representation in Early Vision Pouget, Alexandre; Fisher, Stephen A; Sejnowski, Terrence J In: Journal of cognitive neuroscience. - Cambridge, Mass. : MIT Press Journals 5 (1993) 2, 150-161 OLC Linguistik Show details

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