Neuroinformatician blog

Submitted by iftu11 on
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Significance of functional correlation matrices on a group level

Submitted by David on
Forums
DPABI/DPABISurf/DPARSF

Hi,

I extracted the ROI time courses via DPABI and specified the AAL atlas. This gives me a of ROI correlation matrix as mat-file for every test subject. But how to determine the significance of the correlations between ROI's on a group level, i.e. if a correlation is significant over all test subjects?

question about mask in alff

Submitted by fish on
Forums
DPABI/DPABISurf/DPARSF

Dear Dr.Yan,

 Could I bother you a basic question ? When I was doing ALFF, the mask should be the graymask I made based on the subjects, or be the one-sample t-test? Because the result between the two methods is a little different. The second question is that if I regress out the graymatter volume from the alff, what the mask should I put into?

Best

Fish

Error: Index of element to remove exceeds matrix dimensions

Submitted by gspitz on
Forums
GraphVar

Dear users,

 

I have started to use GraphVar, though am still learning all of the functions.

I was able to follow the tutorial, but am now running into some difficulties using some of my own 'practice' data of 5 participants.

I have used ExploreDTI to create some connecitivty matrices. ExploreDTI does not output the matrices in the correct format required for GraphVar, whereby the main diagonal may not always equal to '0'. I have, therefore, changed all main diagonal elements to equal '0'.

Want to know more about SICE ( Sparse Inverse Covariance Estimation)

Submitted by minihk on
Forums
GraphVar

Hii all,

I would like to know more about SICE method. In GraphVar I am using following procedure for creating connectivity matrices from time series.

Using time series of fmri images I want to create connectivity matrix of particular SICE target density (0.25-0.45) with an increment of 0.05.  I would like to know more about SICE target density. Does it means, say 0.25 target density means 25 percent of your connections are retained or not?.

Pls help me to clear this doubt.

 

Thanks,

Mini

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