The question I have relates to concatenating sessions for DCM analysis. I have been told to include a user defined regressor (UDR) in the design matrix to account for the change in sessions. The regressor consists of 0's followed by 1's for 3 scans at the end and beginning of each session (except for the first 3 and last 3 scans). Does this regressor account for the change in sessions?
Alternatively, I was wondering whether a UDR that consist of one column per session in the design matrix with 1's during the scans for each session and 0's for rest of the scans would work?
Regards,
Dhananjay
|