滑动窗相关的频率依赖关系

S. Shakil, S. Keilholz, Chin-Hui Lee
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引用次数: 17

摘要

滑动窗口相关(SWC)是静息状态功能MRI扫描中研究功能连接动态的最常用方法之一。这些扫描信号通常是非平稳的,通常在SWC分析之前进行带通滤波,因此相关信号中存在多个频率分量。在本文中,我们研究了两个频率的影响,在这样的信号通过扩展的发现,早期的研究,只考虑一个单一的频率。虽然如前期研究所述,当窗口长度接近最小窗口长度时,SWC的波动会减小,但SWC给出平稳相关值的能力取决于两个频率的比值,而不仅仅是最小频率。此外,在一定条件下,从非平稳分析中提取出调制频率以外的一些不需要的分量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On frequency dependencies of sliding window correlation
Sliding window correlation (SWC) is one of the most popular methods to study the dynamics of functional connectivity from resting-state functional MRI scans. These scanned signals are often non-stationary and normally bandpass filtered before the SWC analysis, so there are more than one frequency component present in the correlating signals. In this paper we study the effects of two frequencies in such signals by extending the findings of an earlier study that considered only a single frequency. Although the fluctuations in the SWC are reduced when the length of the window approaches the minimum window length, as reported in the earlier study, but the ability of the SWC to give the stationary correlation value dependents on the ratio of the two frequencies rather than the minimum frequency only. Furthermore, some undesirable components other than the modulating frequency would be extracted from non-stationary analysis under certain conditions.
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