我看了一篇关于resting的文章，上面有这么一段话：After slice acquisition correction and head motion correction, the fMRI was normalized to the standard SPM2 echoplanar imaging template, re-sampled to 3-mm cubic voxels, and then spatially smoothed with a Gaussian kernel of 4* 4*4mm3 full-width at half-maximum. The resulting fMRI data were temporally band-pass filtered (0.01~o0.08 Hz) to reduce the low-frequency drift and physiological highfrequency respiratory and cardiac noise [1] for further ReHo analysis. For result visualization, the individual highresolution three-dimensional anatomical image was also normalized to the standard SPM2 template. Averaging all individual normalized anatomical images generated the mean normalized anatomical image across participants. The voxels outside the mean brain were excluded to create a mask. Only the voxels within the mask were included in further analysis.
这篇文章里讲到了spatially smooth， 而视频教程上是说在计算reho之前不应该做空间平滑的，我也觉得不应该做空间平滑这个地方，想听听各位老师的意见。
还有为什么要做两次标准化？
谢谢！