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Hi Bethany,

You should just get a thresh_zstat  image for each component which, for each voxel, gives you an idea of which voxels are driving that component. But this doesn't tell you whether this component was "active" in your group.

To perform group statistics (e.g. whether a particular component exhibits statistically significant involvement for your group), you will need to use dual regression:

https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/DualRegression
https://fsl.fmrib.ox.ac.uk/fslcourse/lectures/practicals/ica/index.html#group

Cheers,

Paul

On Sep 9 2019, at 9:36 pm, Bethany Sussman <[log in to unmask]> wrote:
Hello Experts,

I am new to MELODIC ICA and I believe some of the output is missing from the group stats output. I do not see the group t or f files (for each component) in the groupmelodic.ica directory (or any of its subdirectories). I am running MELODIC ICA from the GUI but loading a program and setting the data.

Is this an automatic output of MELODIC ICA and is there a likely reason that it is not being generated?

In the stats arguments, I am currently using:
Variance-normalise timecourses (selected)
Automatic dimensionality estimation (selected)
Multi-session temporal concatenation

in Post-Stats, I am using:
Threshold IC maps: 0.5
Background image: Mean highres
Output full stats folder (selected)

There are two data inputs and fairly standard pre-processing options selected.

I greatly appreciate any help.

Thank you,

Bethany

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