I am currently using spm8 to prepare a DCM analysis however in my GLM I have 4 separate sessions and cannot create a VOI for the subject across all 4 sessions. I tried creating them individually and then using to following code to combine the VOIs:
>> load VOI2, xY2 = xY; load VOI
>> xY.y = [xY.y; xY2.y];
>> xY.X0 = blkdiag(xY.X0,xY2.X0);
>> save VOIC xY
however when I load the combine VOIs into DCM it still only displays one session. Is there something I am missing from the above to concatenate the VOI's. I already created a GLM with all the onsets for the conditions on one session and am using that for the DCM analysis however I am extracting the VOIs from the other GLM with 4 individual sessions since the data looks better using that.
Thanks,
Ajith
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