Dear SPM-experts,
I preprocessed 2 sessions of a subject registering to the first image (SPM12). As I expected, the first row of the rp.txt of the first session contains only zeros, as this is the “original position” of the subject. However, the rp.txt-file of the second session also begins with zeros.
For the second session, I would have expected numbers different from zero, as, if I understood correctly, everything is realigned to the first image and I thought movement is calculated with reference to the first image, too.
Could you please help me to understand this?
And moreover, is this a problem when concatenating sessions, e.g. for connectivity analysis?
Thank you very much,
Carmen
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