Andreas -
I'm not sure I understand your question. There is no problem
(in terms of creating a design matrix) with having events every
0.5 scans, starting from either 0.5 or 1.5 (eg, if the first
event happened at 1s after scanning started, and your TR were
2s, you would enter 0.5 for the first scan.)
Apologies if I have misunderstood you
Rik
andreas joachim bartsch wrote:
>
> Dear SPMers,
> specifying efMRI designs - is it possible to use 0.5 scan increments for
> the conditions? I have tried so, SPM accepted the trial onsets of half
> scans without any problem but the result was not ok (it collapsed at
> half of the session modelling). Do I have to start with 0.5 or 1.5 for
> the primary vector of onset?
> TIA-
> andreas
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