Hello,
In SPM, preprocessing, including slice timing, realign and co-registration, is applied separately in different sessions. However, “image to write” in normalization and “image to smooth” in smooth do not require users to enter the image files separately by different sessions. Is it all right to do normalization and smooth without separating the image by different sessions?
In first level analysis, I enter scans from error trials into one regressor, instead of leaving the scans from error trials in the baseline. However, the problem is that the error trials did not always appear in every session. Is it all right to leave “0” in the onset and the duration in first level analysis when there is no error trial in a given session? Notice that the timing parameter in my design is “seconds”.
Thanks for advice in advance.
Sincerely,
Yihui
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