A dynamical neural network model is presented to show critical roles of neural synchronization and stochastic noise in perceptual alternation of ambiguous figures. In the model a coherent percept is represented by synchronized activity of neurons, and perceptual alternation is caused by exclusive activation of two possible percepts of an ambiguous figure. We show that stochastic fluctuation (noise) added to neural activity plays an essential role in obtaining perceptual alternation. We also complete a psychophysical investigation of alternation distributions, which demonstrates that perceptual alternation is caused by a certain kind of stochastic dynamics in the brain.
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