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Dear Klaas Enno,
Some questions to DCM (multiple subjects)
Design:
E.g.: 1 Subject, 5 Sessions with randomized stimuli
For DCM (audit SPM list):
- concatenate the 5 sessions
- account for session transitions with covariate of no interest
identify ROI’s run DCM
à in SPM99 the data was z-transformed before concatenation
à this possibility was disabled because concatenation is not statistically solid
Should I concatenate?
Should I z-transform the sessions?
Variant 2:
Is there no possibility to concatenate the VOI’s (i.e. the response variables Y.y & Y.XO)?
N.B.: The input from SPM.mat seems to be confined to the onsets (stick-functions)
Cheers,
Sein
-------------------------------------------------------
[work]
Hr. Sein Schmidt
Vision & Motor Systems Group
(Dept. of Neurology)
Charité Campus Mitte
Charitéplatz 1
10117 Berlin, Germany
sein.schmidt-at-charite.de
tel.: ++49 (30) 450.560.045
fax: ++49 (30) 450.560.952
http://www.berlin-neuroimaging-center.de/groups/vision/index_html
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