Temporal coding of contrast in primary visual cortex: When, what, and why
Temporal coding of contrast in primary visual cortex: When, what, and why
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DOI：
10.1152/jn.2001.85.3.1039
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发表时间：
2001-03-01
影响因子：
2.5
通讯作者：
Victor, JD
中科院分区：
文献类型：
--
作者：
Reich, DS;Mechler, F;Victor, JD
主要视觉皮层（V1）中的神经元如何编码视觉刺激的对比度？在本文中，明确计算了V1响应传达有关静态视觉刺激对比的信息。这些响应通常包含几个易于区分的时间组件，这些时间成分称为延迟，瞬态，滋补和关闭。计算每个组件和组件中传达的对比度的信息，可以描述可能与对比度编码有关的时间结构的各个方面。结果表明，与触发速率的尖峰火车响应的时间结构相同或更多或多个对比相关的信息与发射速率的时间结构，并且时间编码的信息在响应发作的延迟中最有力地表现出来。瞬态，补品和关闭反应的贡献相对较小。结果还表明，时间编码对于区分细微的对比度差异很重要，而发射速率对于总歧视很有用。这表明神经元反应的时间结构可能会扩展灵长类动物视觉系统中编码的对比度的动态范围。
How do neurons in the primary visual cortex (V1) encode the contrast of a visual stimulus? In this paper, the information that V1 responses convey about the contrast of static visual stimuli is explicitly calculated. These responses often contain several easily distinguished temporal components, which will be called latency, transient, tonic, and off. Calculating the information about contrast conveyed in each component and in groups of components makes it possible to delineate aspects of the temporal structure that may be relevant for contrast encoding. The results indicate that as much or more contrast-related information is encoded into the temporal structure of spike train responses as into the firing rate and that the temporally coded information is manifested most strongly in the latency to response onset. Transient, tonic, and off responses contribute relatively little. The results also reveal that temporal coding is important for distinguishing subtle contrast differences, whereas firing rates are useful for gross discrimination. This suggests that the temporal structure of neurons' responses may extend the dynamic range for contrast encoding in the primate visual system.