Discuss (controversial) issues

Hi,

It is well-known that depending where we choose seed region of the DMN (e.g.., PCC or mPFC) we can get major difference between the networks. Why is that? If region A was correlated with region B, then it does not matter which of them was seed. Is it because the network we get is a statistical map? So, for example, the most strong correlation of A is with B. But B, has stronger connection with C. So, the when A is a seed I will see the B. But When B is the seed I will not see the A. 

Dear experts,

Hi @all,

I have a question regarding the smoothing of RS fMRI data. I want to compare patiens and controls based on ALFF, fALFF,  ReHO, VHMC and also want to use the extracted AAL ROIs to analyze each subject individually for calculating cross-correlation between ROIs. Now I was wondering if it is even necessary to apply smoothing to the data at all? I was also wondering if it is necessary to apply the head motion scrubbing regressors or if ths will corrupt the calculation of ALFF, fALL asf. ? Because as I understood scrubbing removes bad time points.

Dear experts,

I am a novice in fMRI. I would like to ask a question about  the preprocessing of ReHo. Is it necessary to include "nuisance regression" in the preprocessing step? In some literatures it was not mentioned, while in some others it was included. Is "nuisance regression" necessary?

Thank you for your kind reply!

Charlotte.

Dear experts,

Please help me! 

What's the relation between the region of secondary somatosensory cortex (S2) and parietal operculum (OP)?

Is the region of S2 contained within OP entirely, or OP contained within S2 entirely?

Thank you very much!

Dear colleagues I am beginner in rest state fMRI experiments, my question might look silly for you, I saw many rest fMRI protocols they mentioned that TR should not exceed 3000ms, is it technical issue or it has some relation to mechanism of the brain networking and MR signal, and what they mean by Default mode network shows up in resting fMRI as areas with temporally correlated baseline activity, 0.01 Hz < frequency < 0.08 Hz. thank you for your contribution.

Dear experts,

Hi,