How local is the local field potential?

How local is the local field potential?
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DOI:
10.1016/j.neuron.2011.09.029
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发表时间:
2011-12-08
期刊:
影响因子:
16.2
通讯作者:
Schroeder CE
Schroeder CE
中科院分区:
医学1区
文献类型:
--
作者:
Kajikawa Y;Schroeder CE

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局部场电位 (LFP) 在神经生理学研究中变得越来越重要。 LFP 通过索引与 EEG、MEG 和血流动力学 (fMRI) 信号相关的活动来补充动作电位记录。最近的报告表明,LFP 反映了数百微米的非常小的区域内的活动。我们通过比较猕猴听觉皮层的 LFP、电流源密度 (CSD) 和多单元活动 (MUA) 信号来检验这一结论。通过频率调谐带宽估计,这些信号的“收听区域”系统地不同,顺序为:MUA < CSD < LFP。计算分析证实,观察到的 LFP 收到了非本地捐款。直接测量表明 LFP 被动扩散到距离其起源一厘米以上的地点。这些发现似乎与 LFP 的频率内容无关。我们的结果挑战了 LFP 录音通常在极其有限的本地域上集成的想法。相反,LFP 表现为本地电势与远程站点“体积传导”电势的混合体。
Local field potentials (LFPs) are of growing importance in neurophysiological investigations. LFPs supplement action potential recordings by indexing activity relevant to EEG, MEG and hemodynamic (fMRI) signals. Recent reports suggest that LFPs reflect activity within very small domains of several hundred microns. We examined this conclusion by comparing LFP, current source density (CSD), and multiunit activity (MUA) signals in macaque auditory cortex. Estimated by frequency tuning bandwidths, these signals' “listening areas” differ systematically with an order of: MUA < CSD < LFP. Computational analyses confirm that observed LFPs receive non-local contributions. Direct measurements indicate passive spread of LFPs to sites more than a centimeter from their origins. These findings appear to be independent of the frequency content of the LFP. Our results challenge the idea that LFP recordings typically integrate over extremely circumscribed local domains. Rather, LFPs appear as a mixture of local potentials with “volume conducted” potentials from distant sites.
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