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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Excitatory and suppressive receptive field subunits in awake monkey primary visual cortex (V1)
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Excitatory and suppressive receptive field subunits in awake monkey primary visual cortex (V1)

机译：清醒的猴子初级视觉皮层（V1）中的兴奋性和抑制性感受野亚基

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摘要

An essential step in understanding visual processing is to characterize the neuronal receptive fields (RFs) at each stage of the visual pathway. However, RF characterization beyond simple cells in the primary visual cortex (V1) remains a major challenge. Recent application of spike-triggered covariance (STC) analysis has greatly facilitated characterization of complex cell RFs in anesthetized animals. Here we apply STC to RF characterization in awake monkey V1. We found up to nine subunits for each cell, including one or two dominant excitatory subunits as described by the standard model, along with additional excitatory and suppressive subunits with weaker contributions. Compared with the dominant subunits, the nondominant excitatory subunits prefer similar orientations and spatial frequencies but have larger spatial envelopes. They contribute to response invariance to small changes in stimulus orientation, position, and spatial frequency. In contrast, the suppressive subunits are tuned to orientations 45°-90° different from the excitatory subunits, which may underlie cross-orientation suppression. Together, the excitatory and suppressive subunits form a compact description of RFs in awake monkey V1, allowing prediction of the responses to arbitrary visual stimuli.
机译：理解视觉处理的重要步骤是表征视觉通路各个阶段的神经元感受野（RF）。然而，超出初级视觉皮层（V1）中简单细胞的RF表征仍然是一个重大挑战。尖峰触发协方差（STC）分析的最新应用极大地促进了麻醉动物中复杂细胞RF的表征。在这里，我们将STC应用于清醒猴子V1中的RF表征。我们发现每个细胞最多有9个亚基，包括标准模型所描述的一个或两个主要的兴奋性亚基，以及其他贡献较弱的兴奋性和抑制性亚基。与显性亚基相比，非显性兴奋性亚基倾向于相似的方向和空间频率，但具有较大的空间包络。它们会导致对刺激方向，位置和空间频率的微小变化做出响应不变性。相反，抑制性亚基被调节为与兴奋性亚基不同的45°-90°取向，这可能是交叉取向抑制的基础。兴奋性亚基和抑制性亚基共同构成了清醒猴子V1中RF的紧凑描述，从而可以预测对任意视觉刺激的反应。

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