Dynamic properties of internal noise probed by modulating binocular rivalry
Dynamic properties of internal noise probed by modulating binocular rivalry
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DOI：
10.1371/journal.pcbi.1007071
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发表时间：
2019-06-01
影响因子：
4.3
通讯作者：
Richard, Bruno
中科院分区：
文献类型：
--
作者：
Baker, Daniel H.;Richard, Bruno
神经系统天生就有噪声，这种噪声会时时影响我们的感知。这在双眼竞争中尤其明显，其中向左眼和右眼显示的竞争刺激的感知随时间交替。我们调制竞争刺激使用动态序列的外部噪声的各种速率和幅度。我们将每个外部噪声序列重复两次，并评估重复过程中感知的一致性。足够高对比度的外部噪声调制增加了基线以上的一致性评分，并且在1/8Hz时最有效。竞争的计算模型，其中内部噪声具有1/f（粉红色）的时间振幅谱，和16%的对比度的标准差，提供了我们的数据的最佳帐户。我们的新技术提供了详细的估计动态特性的内部噪声在双目竞争，并通过扩展的随机过程，驱动我们的感知和其他类型的自发脑activity.Author摘要虽然我们的感知世界似乎恒定，感觉表征是可变的，因为嘈杂的'生物神经元的性质。在这里，我们使用了一个双目竞争的范例，其中冲突的图像显示给两只眼睛，探测这种内部变异的属性。使用一种新的范例，其中的对比度的竞争刺激调制由两个独立的外部噪声流，我们推断的幅度和字符的内部噪声。噪声的时间幅度谱具有1/f谱，类似于自然视觉输入的时间幅度谱，并且与视觉系统进化以匹配其环境的想法一致。
Neural systems are inherently noisy, and this noise can affect our perception from moment to moment. This is particularly apparent in binocular rivalry, where perception of competing stimuli shown to the left and right eyes alternates over time. We modulated rivalling stimuli using dynamic sequences of external noise of various rates and amplitudes. We repeated each external noise sequence twice, and assessed the consistency of percepts across repetitions. External noise modulations of sufficiently high contrast increased consistency scores above baseline, and were most effective at 1/8Hz. A computational model of rivalry in which internal noise has a 1/f (pink) temporal amplitude spectrum, and a standard deviation of 16% contrast, provided the best account of our data. Our novel technique provides detailed estimates of the dynamic properties of internal noise during binocular rivalry, and by extension the stochastic processes that drive our perception and other types of spontaneous brain activity.Author summary Although our perception of the world appears constant, sensory representations are variable because of the noisy' nature of biological neurons. Here we used a binocular rivalry paradigm, in which conflicting images are shown to the two eyes, to probe the properties of this internal variability. Using a novel paradigm in which the contrasts of rivalling stimuli are modulated by two independent external noise streams, we infer the amplitude and character of this internal noise. The temporal amplitude spectrum of the noise has a 1/f spectrum, similar to that of natural visual input, and consistent with the idea that the visual system evolved to match its environment.