> Two brief questions on SPM'99 from a principiant:
> 1) about slice timing, which slice would you suggest to choose as reference
> having 20 slices for each volume (block-design)?
Someone asked a similar question to this back in May, and it stirred up a
bit of discussion. You may wish to take a look at the old messages:
http://www.mailbase.ac.uk/lists/spm/1999-05/0166.html
http://www.mailbase.ac.uk/lists/spm/1999-05/0168.html
http://www.mailbase.ac.uk/lists/spm/1999-06/0002.html
http://www.mailbase.ac.uk/lists/spm/1999-06/0005.html
http://www.mailbase.ac.uk/lists/spm/1999-06/0012.html
http://www.mailbase.ac.uk/lists/spm/1999-06/0018.html
> 2) about realign, what do you intend with "session"? Two different sessions
> are two blocks of different tasks or two separate functional (and obviously
> anatomical) acquisitions on the same subject at two different moment in
> time?
I think it is the latter.
In spm96b, a session is considered as a block of functional scans where
all the volumes were acquired in the same run - i.e., there is the same
repeat time between all images. If scanning is stopped and restarted,
then it becomes a new session.
Regards,
-John
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