cat's blog

Dear Expert,

I am grateful for your help. I have not received an answer so I am reposting this question. 

I am trying to extract the  time-course signals using DPABI's signal exractor tool for a single subject event-related run that has been pre-processed with SPM. My question is as follows: 

Dear Expert:

I am trying to extract the  time-course signals using DPABI's signal exractor tool for a single subject event-related run that has been pre-processed with SPM. My question is as follows: 

Would the signal extractor tool work for an event-related run? if so, should I enter the 'con.nii' files or the spmT.nii files?

I would really appreciate your  expert guidance,

Best,

Catherine

Dear Experts,
I re-ran 2 subjects through DPABI using the same parameters and ROIs that I used for the same two people that I ran as part of a larger group ( n=50).
When I compare the output folders FunImgARCFWS_ROISIGNALS/ROISIGNALS_subjectx of the same person, the ROI time courses look very different, even though I used the same parameters as before.
Would you know why that is? I can only imaging that in my prior analysis these two subjects were run as part of a different group? Does the ROISignals .text output gets normalized according to the included subjects?

Dear R-fMRI Network team,
I am looking at the ROI Signals_ xxx which outputs the time courses for each ROI and I am surprised that some of these numbers are negative? Could you please explain why that would be the case?
With kind regards,
Catherine

Dear Sir,

I am re-posting this question as I have not yet received an answer.

We have several reviewer questions that I would kindly ask your assistance with and which relate to the use of your very valuable DPARSF toolbox.

1)Using DPARSF we have bandpass filtered at 0.01-0.1 Hz. The reviewer requested to precisely state the 'type of filter". Was the filtering based on a 'discrete cosine transform' as done in SPM with the given frequencies used as cut-off, I believe this is correct, but just wanted to confirm.

Dear Sir,

In your DPARSF toolbox I selected "motion scrubbing" and selected the FD (power) option.
The reviewer of our manuscript asked what the assumed head radius was? Would you be able to help with this?
With kind regards,
Catherine

Dear Sir,

We have several reviewer questions that I would kindly ask your assistance with and which relate to the use of your very valuable DPARSF toolbox.

1)Using DPARSF we have bandpass filtered at 0.01-0.1 Hz. The reviewer requested to precisely state the 'type of filter". Was the filtering based on a 'discrete cosine transform' as done in SPM with the given frequencies used as cut-off?

Dear Expert,

I successfully used DPARSF to define 33 ROI's and to extract the ROI time courses for my subjects.
I have two groups and I want to see if the connectivity within the 33 ROI differs between groups.

I would be grateful if you could advise me on how to set up this analysis in the dpabi "statistical analysis toolbox'. I am not sure what files I need to input from each individual. Are these the .mat files or the .txt files?

With kind regards,
Cat

Dear Expert,

I have calculated the resting state BOLD signal for several ROI's using your valuable toolbox Dpabi in order to assess functional connectivity patterns between these ROI's.

I found out that the ROI_FCMaps for each person show my 120 time points (rows) for each ROI (columns).
I was surprised that some of the time point signal changes were up to negative 12 or positive 6, although most were somewhere between negative 4 and positive 4. Are these outliers? Should I be concerned about the validity of the time point data?

With Kind Regards,
Cat

Dear Experts,

I wish to examine the functional connectivity between 4 regions (ROI's) only. Is this a possibility in DPARSF A.
Or does DPARSF only measure the functional connectivity between the ROIs with the rest of the brain?
Very Kind Regards,
Cat