Eggermont J J, Smith G M
Department of Psychology, University of Calgary, Alberta, Canada.
Neuroreport. 1995 Nov 13;6(16):2121-4. doi: 10.1097/00001756-199511000-00006.
Cross-correlograms between spike trains of simultaneously recorded units in cortex show peaks that range in width from a few milliseconds to tens of milliseconds regardless of the distance between the units. The peak width reflects the degree of synchronization between the firings resulting from local connectivity and global synchronization. The local connectivity part may be hidden in the much stronger and broader correlations due to diffuse global synchronizing forces. This study proposes an estimator for such global synchronizing effects upon unit-pair correlations based on local field potentials (LFPs). It appears that the relative importance of the global component in the unit-pair correlograms as predicted by LFPs is largest in spontaneous activity and for units recorded on distant electrodes.
在皮质中同时记录的神经元放电序列之间的互相关图显示，无论神经元之间的距离如何，峰值宽度范围从几毫秒到几十毫秒。峰值宽度反映了由局部连接性和全局同步性所导致的放电同步程度。由于弥散的全局同步力，局部连接性部分可能隐藏在更强、更广泛的相关性之中。本研究基于局部场电位（LFP）提出了一种用于估计此类全局同步效应作用于神经元对相关性的方法。结果表明，由LFP预测的全局成分在神经元对互相关图中的相对重要性在自发活动中以及在记录于远距离电极上的神经元中最大。
