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首页> 外文期刊>The European Journal of Neuroscience >Stimulus locking and feature selectivity prevail in complementary frequency ranges of V1 local field potentials.
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Stimulus locking and feature selectivity prevail in complementary frequency ranges of V1 local field potentials.

机译：在V1局部电场电势的互补频率范围内，普遍存在刺激锁定和特征选择性。

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摘要

The local field potential (LFP) is a population measure of neuronal activity complementary to spike trains. Whereas the response properties of the spiking activity in the visual cortex have been characterized extensively, the responses of the LFP have not been well explored. No coherent picture exists about which frequency ranges exhibit feature tuning or show stimulus locked activity. Addressing this, we recorded LFP in the primary visual cortex of alert cats and calculated the tuning indices for orientation, spatial and temporal frequency. Furthermore, we quantified the locking of the power in different LFP frequency bands to the velocity profile of artificial and natural stimuli. We found that the LFP in alert animals is well tuned with similar specificity to orientation, spatial frequency and temporal frequency. Tuning to these features is most prominent in two frequency bands (8-23 Hz and 39-109 Hz). In two complementary frequency bands (23-39 Hz and above 109 Hz) the dynamics of the LFP power is locked tightly to the temporal structure of the stimulus. This locking is furthermore independent of the spatial structure of the stimulus. Together these four frequency bands cover the whole frequency range investigated. In contrast to previous studies, which often reported correlates of visual processing only in a limited frequency range of the LFP, the present results suggest that the entire frequency range of the LFP can be assigned a role in visual processing.
机译：局部场电势（LFP）是对神经元活动的补充，它是对峰值序列的补充。尽管已经广泛表征了视觉皮层中突刺活动的响应特性，但尚未很好地研究LFP的响应。关于哪个频率范围显示特征调整或显示刺激锁定活动，不存在任何连贯的图片。为了解决这个问题，我们将LFP记录在警觉猫的主要视觉皮层中，并计算了定向，空间和时间频率的调整指数。此外，我们量化了在不同的LFP频带中，功率对人工和自然刺激的速度分布的锁定。我们发现，对机敏动物的LFP进行了很好的调整，具有与定向，空间频率和时间频率相似的特异性。在两个频段（8-23 Hz和39-109 Hz）中，对这些功能的调谐最为突出。在两个互补频带（23-39 Hz和109 Hz以上）中，LFP功率的动态紧密地锁定在刺激的时间结构上。此外，该锁定与刺激的空间结构无关。这四个频带一起覆盖了所研究的整个频率范围。与以前的研究（经常报道仅在LFP的有限频率范围内进行视觉处理的相关性）相反，本研究结果表明，可以将LFP的整个频率范围分配给视觉处理。

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