Questions about covaraites in group-level statistical analysis

Submitted by Peace on Thu, 11/02/2017 - 09:18

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

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Computing connectivity with ROI yields the same cluster. Reasons?

Submitted by JH89 on Wed, 11/01/2017 - 08:25

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.

 

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DPARSF for Rat Data Errors and Questions

Submitted by boggsr on Mon, 10/30/2017 - 18:24

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?

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Error in computing ALFF

Submitted by lilizhoucas on Sat, 10/28/2017 - 03:20
 
严老师，
 
您好！我在用Dpabi做到计算ALFF这一步时，matlab总是会弹出这一错误。我尝试过reslice或替换Masks里面的AllResampled_BrainMask_05_91x109x91.nii文件（详见附件），都没有用。请问该如何解决？
 
期待回复！
 
祝好！
 
周丽丽
 
 
Matlab command:
 
Computing ALFF...

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The Laboratory for Brain Connectivity at (UESTC) is currently seeking postdocs

Submitted by laboratoryforbr... on Fri, 10/27/2017 - 08:38

The Laboratory for Brain Connectivity is currently seeking multiple postdoctoral research fellows to join our lab. The lab was established in October 2017 by Bharat Biswal, a Foreign 1000 Talents Professor at UESTC, Chengdu. Our lab is part of the Center of Information in Medicine and the School of Life Science and Technology at the University of Electronic Science and Technology of China (UESTC). The School/Center has a highly selective doctoral program (PhD issuance authority) in Biomedical Engineering and ranks No. 10 nationwide.

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cannot extract measures from sample matrices

Submitted by lnestor on Thu, 10/26/2017 - 16:24

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 Thu, 10/26/2017 - 08:33

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 ...

Forums:

Question about Mixed effect analysis

Submitted by mitaomian on Wed, 10/25/2017 - 00:13

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

    

Forums:

cannot extract measures from sample matrices

Submitted by lnestor on Thu, 10/19/2017 - 13:58

I have read the GraphVar manual - it's all very clear. I want to get used to simply calculating and exporting graph measures using the Conn Matrix files in the sample workspace.  I have loaded just two of the files (to make it quicker) and chosen to calculate measures on the weighted matrices. I chose to extract the Weighted: Strength (UND) values. When I try to do this it just locks the screen and doesn't show anything else (i.e. progress bars). I don't receive any error messages. I have tried on other weighted measures and experience the same thing.

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