Rebecca
You need to input the cope images from g.feat for each subject in your analyses.
With respect to a ROI, you can threshold on one FSL's masks (e.g. left anterior cingulate, right nucleus accumbens) if you have an a priori regarding a specific region of the brain.
From here, you can then extract a % change score for each subject in a particular region (e.g. left anterior cingulate, right nucleus accumbens) in FEATQUERY using the same mask you thresholded on.
Liam.
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Liam Nestor, Ph.D
Office C8-523
Laboratory for Molecular Neuroimaging
Semel Institute for Neuroscience and Human Behavior
760 Westwood Plaza
Los Angeles 90024
Tel: 310-206-0655
E-mail: [log in to unmask]
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________________________________________
From: FSL - FMRIB's Software Library [[log in to unmask]] On Behalf Of Rebecca [[log in to unmask]]
Sent: Tuesday, April 21, 2009 9:02 AM
To: [log in to unmask]
Subject: [FSL] ROI on g.feat?
Dear All,
I would like some advice about performing an ROI on my data. I am looking for
percentage signal change and just want to make sure I am using the correct
file.
I have combined first level analyses using fixed effects to produce a g.feat per
subject for the task.
My question is which analysis do I perform the ROI on - the 2 first level
analysis (then get the mean of the two values)
OR
the g.feat analysis for each individual subject. In other words use the g.feat
file as though it is a first level analysis.
Any advice is greatly appreciated
Rebecca
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