Thatcher Robert W
NeuroImaging Laboratory, Applied Neuroscience Research Institute, St. Petersburg, Florida, USA.
Dev Neuropsychol. 2012;37(6):476-96. doi: 10.1080/87565641.2011.619241.
Electroencephalogram (EEG) coherence is a mixture of phase locking interrupted by phase shifts in the spontaneous EEG. Average reference, Laplacian transforms, and independent component (ICA) reconstruction of time series can distort physiologically generated phase differences and invalidate the computation of coherence and phase differences as well as in the computation of directed coherence and phase reset. Time domain measures of phase shift and phase lock are less prone to artifact and are independent of volume conduction. Cross-frequency synchrony in the surface EEG and in Low Resolution Electromagnetic Tomography (LORETA) provides insights into dynamic functions of the brain.
脑电图（EEG）相干性是自发脑电图中由相位偏移中断的锁相混合。时间序列的平均参考、拉普拉斯变换和独立成分分析（ICA）重建可能会扭曲生理产生的相位差异，并使相干性和相位差异的计算以及定向相干性和相位重置的计算无效。相移和锁相的时域测量受伪迹影响较小，并且与容积传导无关。表面脑电图和低分辨率电磁断层扫描（LORETA）中的跨频率同步为大脑的动态功能提供了见解。
