Event Abstract Back to Event Measuring speed of moving textures: Different pooling of motion information for human ocular following and perception Claudio Simoncini1*, Laurent U. Perrinet2, Anna Montagnini2, Pascal Mamassian3 and Guillaume Masson2 1 Institut de neuroscience de la Timone, CNRS, France 2 Institut de Neurosciences Cognitives de la Méditerranée (INCM) CNRS, France 3 Université Paris Descartes, Laboratoire Psychologie de la Perception (CNRS UMR 8158), France To measure speed and direction of moving objects, the cortical motion system pools information across different spatiotemporal channels. One yet unsolved question is to understand how the brain pools this information and whether this pooling is generic or adaptive at the behavioral contexts. Here, we investigate in humans this integration process for two different tasks: psychophysical speed discrimination and ocular following eye movements, which are a probe of early motion detection and integration (Masson & Perrinet, 2011). For both tasks, we used short presentations of “moving textures” stimuli (Schrater et al., 2000) in which the width of the spatial frequency distribution (Bsf) was varied. We found that larger Bsf elicited stronger initial eye velocity during the open-loop part of tracking responses. Moreover, richer stimuli resulted in more accurate and reliable motor responses. By contrast, larger Bsf had a detrimental effect upon speed discrimination performance: speed discrimination thresholds linearly decreased when the width of spatial frequency distribution increased. These opposite results can be explained by a different decoding strategy where speed information is under the control of different gain setting mechanisms. We tested this model by measuring contrast response functions of both ocular following and speed discrimination for each Bsf. We found that varying spatial frequency distribution had opposite effect upon contrast gain control. Increasing Bsf lowered half-saturation contrast for ocular following but increased it for perception. Our results supports the view that speed-based perception and tracking eye movements are under the control of different early decoding mechanism. References Masson, G.S. & Perrinet, L.U. The behavioural receptive field underlying motion integration for primate tracking eye movements. Neurosci. BioBehav. Review 36, 1-25 (2011). Schrater, P.R., Knill, D.C. & Simoncelli, E.P. Mechanism of visual motion detection. Nat. Neurosci. 3, 64-68 (2000). Keywords: Eye Movements, Motion Perception, Psychophysics Conference: Neural Coding, Decision-Making & Integration in Time, Rauischholzhausen, Germany, 26 Apr - 29 Apr, 2012. Presentation Type: Poster Presentation Topic: Neural Coding, Decision-Making & Integration in Time Citation: Simoncini C, Perrinet LU, Montagnini A, Mamassian P and Masson G (2012). Measuring speed of moving textures: Different pooling of motion information for human ocular following and perception. Front. Neurosci. Conference Abstract: Neural Coding, Decision-Making & Integration in Time. doi: 10.3389/conf.fnins.2012.86.00016 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 12 Jan 2012; Published Online: 16 Jan 2012. * Correspondence: Mr. Claudio Simoncini, Institut de neuroscience de la Timone, CNRS, Marseille, France, claudio.simoncini@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Claudio Simoncini Laurent U Perrinet Anna Montagnini Pascal Mamassian Guillaume Masson Google Claudio Simoncini Laurent U Perrinet Anna Montagnini Pascal Mamassian Guillaume Masson Google Scholar Claudio Simoncini Laurent U Perrinet Anna Montagnini Pascal Mamassian Guillaume Masson PubMed Claudio Simoncini Laurent U Perrinet Anna Montagnini Pascal Mamassian Guillaume Masson Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.