Bifurcation analysis applied to a model of motion integration with a multistable stimulus

James Rankin 1, * Émilien Tlapale 1 Romain Veltz 1 Olivier Faugeras 1 Pierre Kornprobst 1
* Auteur correspondant
CRISAM - Inria Sophia Antipolis - Méditerranée , INRIA Rocquencourt, ENS Paris - École normale supérieure - Paris, UNS - Université Nice Sophia Antipolis, CNRS - Centre National de la Recherche Scientifique : UMR8548
Abstract : A computational study into the motion perception dynamics of a multistable psychophysics stimulus is presented. A diagonally drifting grating viewed through a square aperture is can be perceived as moving in the actual grating direction or in line with the aperture edges (horizontally or vertically). The different percepts are the product of interplay between ambiguous contour cues and specific terminator cues. We present a dynamical model of motion integration that performs direction selection for such a stimulus and link the different percepts to coexisting steady-states of the underlying equations. We apply the powerful tools of bifurcation analysis and numerical continuation to study the changes to the model's solution structure under the variation of parameters. Indeed, we apply these tools in a systematic way, taking into account biological and mathematical constraints, in order to fix model parameters. A region of parameter space is identified for which the model reproduces the qualitative behaviour observed in experiments. The temporal dynamics of motion integration are studied within this region; specifically, the effect of varying the stimulus gain is studied, which allows for qualitative predictions to be made.
Type de document :
[Research Report] RR-7822, INRIA. 2011, pp.39
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Soumis le : mercredi 23 mai 2012 - 08:14:06
Dernière modification le : jeudi 26 avril 2018 - 10:28:51
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James Rankin, Émilien Tlapale, Romain Veltz, Olivier Faugeras, Pierre Kornprobst. Bifurcation analysis applied to a model of motion integration with a multistable stimulus. [Research Report] RR-7822, INRIA. 2011, pp.39. 〈hal-00646387v2〉



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