Balance between noise and adaptation in competition models of perceptual bistability.
Balance between noise and adaptation in competition models of perceptual bistability.
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DOI：
10.1007/s10827-008-0125-3
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发表时间：
2009-08
影响因子：
1.2
通讯作者：
Rinzel, John
中科院分区：
文献类型：
--
作者：
Shpiro, Asya;Moreno-Bote, Ruben;Rubin, Nava;Rinzel, John
当一个物理刺激引起两种不同的解释，不规则地交替时，就会出现知觉双稳态。噪声和适应过程是描述交替行为的神经元竞争模型中两种可能的切换机制。这两个过程中的任何一个，如果足够强大，都可以单独导致优势的改变。我们通过研究模型来研究它们在产生交替中的相对作用，在这些模型中，通过平滑地改变参数，可以将节奏发生机制从适应驱动改变为噪声驱动。考虑到交替统计的实验限制（优势持续时间分布的平均值和形状以及连续持续时间之间的相关性），我们问我们是否可以排除其中一种机制。我们的结论是，为了遵守观察到的平均值的优势持续时间和它们的变异系数，该模型必须在噪声和适应强度之间的平衡，这两种机制都参与生产交替，在这样一种方式，该系统的操作之间的边界附近的适应驱动和噪声驱动。
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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