> 1- when the software asks , 'which session' the maximum is 46 instead
> of 54(2*27). why?
>
> 2- how can i choose all of the runs, at a time and together. can i
> find a scrip for it?
Hi Ahmad, I think there's some confusion here regarding terminology...
The eigenvariate button extracts a single timeseries for the whole of a session. So if I understand your study correctly, you have a choice here of choosing session 1 or session 2. It does not generate a timeseries for each trial (or "run" as you call them).
Note that typical SPM terminology is that a 'session' is a period of time when the scanner is recording data. Within a session you'll have many trials (which may be grouped together to form blocks).
Best,
Peter.
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