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SPM  April 2009

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Subject:

Re: first and second level analses question

From:

"Stephen J. Fromm" <[log in to unmask]>

Reply-To:

Stephen J. Fromm

Date:

Fri, 10 Apr 2009 19:46:28 +0100

Content-Type:

text/plain

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Parts/Attachments

text/plain (52 lines)

On Thu, 9 Apr 2009 12:01:54 -0400, Jeffrey West 
<[log in to unmask]> wrote:

>hello
> 
>i am attempting to limit the overall sessions required for my first level 
analysis. basically, i have two groups of subjects, each with 10 participants, 
totalling 20 subjects.  for my tasks, i have 2 scans, one scan performed prior 
to training administering an easy 1 task and an easy 2 task, also, a hard 1 
task and a hard 2 task. this is the same pattern for both groups. 
> 
>i would like to put as many of the variables into the first level analysis as 
possible, to eliminate the arguement that the pre and post or the easy and 
hard tasks may have different baselines. so for example, for my first analysis, i 
want to look at group 1 pre-training for the easy 1 and 2 and the hard 1 and 2 
variables. i am using spm2 for these analyses. so for this first level analysis, 
each subject will have 4 sessions (one for easy1, easy 2, hard 1, and hard2) 
and that will give me 40 total sessions. this seems like  a lot of seesions, one 
for me to enter and two for the computer to analyze. i am ok with doing this 
(as long as i dont have to start over), but it seems there should be a way to 
combine e1 with e2 and h1 with h2 to take the sessions down to 20 total. i 
can do this, but then i am stuck because i do not have vectors for e1 
combined with e2 or h1 combined with h2. i only have vectors for them 
separately. i would really appreciate any suggestions on where to go from 
here.
> 
>because in some of the other analyses i have planned, i would like to look at 
subtracting group 1 (pre-training easy 1 and easy 2) from group 1 (post-
training easy 1 and easy 2), so each subject will have  4 sessions for a total 
of 40 sessions again.

I don't think combining sessions is a good idea, unless you're very careful 
about how you go about it.  (There's been some posts on this list about this, 
one pretty recently I believe.)  Here, by "combining sessions" I assume you 
mean taking multiple scanner runs (run = images gathered without the scanner 
being off) and getting SPM to think they're one run.

If you're concerned about the labor needed to input the data, you might 
consider other labor-saving devices (maybe you already have).  First, you can 
do batch scripting.  Or you can store data (like vectors for onsets, user-
specified regressors) in variables in the matlab workspace, and then just type 
the variable name in the textbox.


> 
>thank you for your time.
> 
>jef
> 
>
>

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