Dear SPMers
I have a number of DCM questions-
SMOOTHING:
Is there any reason to use a small smoothing kernel in DCM analysis, more
than in the cnventional analysis (I saw 3.75 and 5 mm in the published
papers)?
INTERPRETATION:
1- How are the 'intrinsic connnections' calculated? Is it the connections
during baseline (the tails of the hrf)?
2 - What is the meaning of the 'b' parameters: Is it the STRENGTH of the
connection during the external input, or is it the CHANGE in strength
during the external input relative to baseline?
In other words: Are the 'b' parameters comparable across different models
of the same subject? across subjects?
GROUP ANALYSIS:
Is there a way to do group analysis in DCM2? Which '.img' files can be
imported to the second level?
Thanks a lot for any help
Tali Bitan
Research Associate
Department of Communication Sciences & Disorders
Northwestern University, IL
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