Paola Valsasina wrote:

Dear FS list,

I have a couple of questions about QDEC toolbox.

1. If I perform a multiple regression model and I obtain a significant

cluster of correlation, is it possible to extract the corresponding regression coefficient, in order to report the strength of this correlation at that point?

If you run the simulation, there should be a file in each contrast output directory called something like "cache.th20.abs.y.ocn.dat". This has a matrix of numbers. The rows are each subject, the columns are each significant cluster.

2. Is it possible to perform some kind of masking? (e.g., to quantify

correlation with a metric only within cortical areas that are different between groups?)

Not within QDEC. You can run mri_glmfit and give it a mask (--mask).

3. Is it correct that it is not possible to overlay the results of

different qdec models on the same brain within qdec toolbox, but that we have to use a different tool (e.g. freeview?) to overlay multiple sig.mgh images at the same time?

Correct, you cannot overlay different models in qdec.

doug

Thank you for any help

Kind regards,

Paola

http://www.5xmille.org

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