ZangYF Group's CVs

用SPM5的PairedTTest处理数据时，选择刺激组和对照组数据的先后顺序对结果有影响么？

我分别试了对调它们的顺序，然后contrast都是1 -1，发现结果一模一样，T值的正负也是一样。

如果说数据选择的先后顺序没有影响，那应该如何来解释结果呢？比如说刺激数据在前，对照数据在后，contrast是1 -1，那T值是正值的脑区代表的是刺激>对照，还是刺激<对照？

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 ReH

Dear SONG Xiao-Wei and YAN Chao-Gan:

Thank you for making REST fmri analysis software available. It has
been very helpful in my analyses.
I have a question about how the software analyzes covariables.

I notice that you add both a linear and a mean regressor to the
covariable matrix.
I understand why you add the mean, but why is the linear regressor also added?
Wouldn't this have been taken care of by detrending the data?

thank you,
-----
Darren Gitelman

Dear Dr. YAN Chao-Gan,

My name is Phuong Hoa, I am studying in Korea. I found your REST toolkit and I am interested in it.

Now I try to measure the functional connectivity from fMRI data with task-related (visual and motor stimuli).

I used ROI-wise with AAL template, but I saw all the correlation coefficient in the result is very high.

Does REST can analyze this kind of data? (Because I wonder REST is for resting-state analysis).

Best regards,
Phuong Hoa