Questions about covaraites in group-level statistical analysis

Submitted by Peace on
Forums
DPABI/DPABISurf/DPARSF

Dear Experts

Here is a couple of questions regarding a covariate analysis for rsfMRI:

  1. For motion regreseed (as Text Covariates) -> choose mean FD value in headmotion.tsv under the the directory of Realignment right?
  2. For global iFC correlation (as Covariate images)-> which files should I pick up? (FC_FunImgARglobalCWF?)
  3. Gray matter portion (as Covaraite images) ->choose wc*.
  4. Any suggested reading or example for ANCOVA and repeat measure setup

Thanks for considering my request!

Cheers

Larry

Computing connectivity with ROI yields the same cluster. Reasons?

Submitted by JH89 on
Forums
DPABI/DPABISurf/DPARSF

Hi everyone,

after preprocessing I computed functional connectivity of one cluster (one node of the DMN predefined in the toolbox: x = -6 y = 52 z = -2). I did this for 20 subjects. Afterwards I computed a t-test versus zero (SPM contrast: 1) based on the connectivity map of each participant.

 

DPARSF for Rat Data Errors and Questions

Submitted by boggsr on
Forums
DPABI/DPABISurf/DPARSF

Hello,

I am new to using DPARSF and have watched the videos discussing how to you use it for both human and rat data. I still had a few questions though because I still cant get my data to process properly.

1) Do we need whole brain data? (I have 9 slices spanning 1 mm per slice in our interested regions)

2) Our data is in a 128 x 128 matrix, will this cause issues when using the 96x96x30 rat brain template?

cannot extract measures from sample matrices

Submitted by lnestor on

Can anybody answer the query I posted below one week ago? I also neglected to mention that the error messages below are printed to the matlab terminal.

 

Liam.

 

Cell contents reference from a non-cell array object.

 

Error in GraphVar_getDialogData>check_StructureName (line 339)

if isscalar(handles.vpNamesNeo{2})

 

 

Error in GraphVar_getDialogData (line 82)

if(~check_StructureName(handles,forCalcFunc))

 

 

Error in GraphVar_calc (line 29)

Mismatch between coordinates of defined ROI and Matlab output

Submitted by JH89 on
Forums
DPABI/DPABISurf/DPARSF

Hi everyone, I have the following problem: I tried to compute functional connectivity by using the 'Define ROI' button. As ROI I selected one of the Default ROIs (taken from Andrew-Hannas nodes of the DMN). This Region had the following coordinates: -6 52 2 (radius: 5). However, the following output in the Matlab command window does not fit these coordinates. See the following lines ...

Question about Mixed effect analysis

Submitted by mitaomian on
Forums
DPABI/DPABISurf/DPARSF

严老师好, 

   我想请教下关于mixed effect analysis的问题。我想看下实验组和对照组治疗前后ALFF差异，做了mixed effect analysis, 其中interaction effect做出4个脑区。我又做了下每个组治疗前后各自的差异，实验组发现5个脑区，对照组发现7个脑区，这些脑区与之前的4个脑区不全相同。我的问题是，是否需要再单独做治疗前后配对样本t检验，还是重点放在interaction发现的4个脑区上就可以了？另外，mixe分析做出的group effect和condition effect意义是不是不大，是否还需要单独讨论？

   另外，提取时间序列时的“directory”应该选择预处理生成的那个文件夹呢？

   希望您能在百忙之中帮忙解答，谢谢您!

   祝好！

   米涛免

    

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