Balance between noise and adaptation in competition models of perceptual bistability |
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Authors: | Asya Shpiro Ruben Moreno-Bote Nava Rubin John Rinzel |
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Institution: | (1) Center for Neural Science, New York University, 4 Washington Place, New York, NY 10003, USA;(2) Courant Institute of Mathematical Sciences, 251 Mercer St., New York, NY 10012, USA;(3) Present address: Department of Mathematics, Medgar Evers College, City University of New York, Brooklyn, New York, NY 11225, USA;(4) Present address: Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY 14627, USA |
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Abstract: | Perceptual bistability occurs when a physical stimulus gives rise to two distinct interpretations that alternate irregularly.
Noise and adaptation processes are two possible mechanisms for switching in neuronal competition models that describe the
alternating behaviors. Either of these processes, if strong enough, could alone cause the alternations in dominance. We examined
their relative role in producing alternations by studying models where by smoothly varying the parameters, one can change
the rhythmogenesis mechanism from being adaptation-driven to noise-driven. In consideration of the experimental constraints
on the statistics of the alternations (mean and shape of the dominance duration distribution and correlations between successive
durations) we ask whether we can rule out one of the mechanisms. We conclude that in order to comply with the observed mean
of the dominance durations and their coefficient of variation, the models must operate within a balance between the noise
and adaptation strength—both mechanisms are involved in producing alternations, in such a way that the system operates near
the boundary between being adaptation-driven and noise-driven. |
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Keywords: | Bistability Competition Mutual inhibition Attractor Oscillator Noise |
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