I'm afraid I don't fully understand. What values are you trying to get, if not the % signal change of the condition of interest compared with baseline/control condition?
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From: SPM (Statistical Parametric Mapping) [[log in to unmask]] On Behalf Of Abraham [[log in to unmask]]
Sent: Thursday, May 20, 2010 11:18 PM
To: [log in to unmask]
Subject: [SPM] Some questions related to fMRI signal change
Dear all,
I use marsbar to obtain % signal change of regressors. But I notice that marsbar only use the SPM.mat and roi.mat files. The signal change seems to be estimated from the results of GLM analysis. If this is so, the signal change is not independent of the model. Is there any way to access the preprocessed data directly and calculate signal change based on them?
Thank you very much.
Abraham
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