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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Coarse to fine dynamics of monocular and binocular processing in human pattern vision
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Coarse to fine dynamics of monocular and binocular processing in human pattern vision

机译：人类模式视觉中单眼和双眼处理的精细动态

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摘要

Biological image processing has been hypothesized to adopt a coarse to fine strategy: the image is initially analyzed at a coarse spatial scale, and this analysis is then used to guide subsequent inspection at a finer scale. Neurons in visual cortex often display response characteristics that are consistent with this hypothesis for both monocular and binocular signals. Puzzlingly, measurements in human observers have failed to expose similar coarse to fine dynamics for human pattern vision, questioning the applicability of direct parallels between single neurons and perception. We performed a series of measurements using experimental protocols that were specifically designed to examine this question in more detail. We were able to confirm that, when the analysis is restricted to the linear properties of the perceptual process, no coarse to fine dynamics were evident in the data. However, when the analysis was extended to nonlinear descriptors, a clear coarse to fine structure emerged that consisted of two processes: an early nonlinear process operating on a coarse spatial scale followed by a linear process operating on a fine spatial scale. These results potentially serve to reduce the gap between the electrophysiological and behavioral findings.
机译：假设生物图像处理采用了从粗到精的策略：首先在粗略的空间尺度上对图像进行分析，然后使用该分析来指导在更精细的尺度上进行后续检查。视觉皮层中的神经元通常表现出与单眼和双眼信号的假设相一致的反应特征。令人费解的是，人类观察者的测量未能揭示人类模式视觉的类似的从粗到精细的动态，从而质疑了单个神经元和感知之间直接平行的适用性。我们使用专门设计用来更详细地研究这个问题的实验方案进行了一系列测量。我们能够确认，当分析仅限于感知过程的线性特性时，数据中没有明显的从粗到细的动态变化。但是，当将分析扩展到非线性描述符时，出现了由两个过程组成的清晰的从粗糙到精细的结构：一个早期的非线性过程在一个粗糙的空间尺度上运行，然后是一个线性过程在一个精细的空间尺度上运行。这些结果可能有助于缩小电生理和行为发现之间的差距。

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