Motion direction integration following the onset of multistable stimuli (II): stability properties explain dynamic shifts in the dominant perceived direction

Abstract : We use a mathematical model to investigate the early temporal dynamics of motion integration with a multistable input. A drifting grating stimulus is considered with an aperture configuration that supports horizontal (H), diagonal (D) or vertical (V) perceived directions for the same input. A shift in perceptual dominance from D to either H/V with increased presentation duration has been shown in short-presentation psychophysics experiments; see our companion abstract (I). We work with a neural fields, population-level representation of cortical activity that performs motion integration of the competing oblique (D) and cardinal (H/V) local direction signals [Rankin et al., 2011, INRIA Report 7822]. When a dynamical system diverges away from a weakly unstable state it can spend an extended transient period close to the unstable state before divergence [Strogatz, 2001, Nonlinear Dynamics and Chaos, Perseus, NY]. Of the competing states representing the alternative percepts, the initially dominant D is computed to be weakly unstable whilst the subsequently dominant H/V are computed to be stable. The property of weak stability explains the gradual shift in dominance from D to H/V. Moreover, as contrast increases, D becomes strongly unstable reducing the latency of this shift in perceptual dominance.
Type de document :
Communication dans un congrès
European Conference on Visual Perception, 2012, Alghero, Italy. pion; London, 2012
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https://hal.inria.fr/hal-00845610
Contributeur : Pierre Kornprobst <>
Soumis le : mercredi 17 juillet 2013 - 14:14:23
Dernière modification le : vendredi 18 mai 2018 - 01:24:58

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  • HAL Id : hal-00845610, version 1

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James Rankin, Andrew Meso, Guillaume S. Masson, Olivier Faugeras, Pierre Kornprobst. Motion direction integration following the onset of multistable stimuli (II): stability properties explain dynamic shifts in the dominant perceived direction. European Conference on Visual Perception, 2012, Alghero, Italy. pion; London, 2012. 〈hal-00845610〉

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