Hi Tiffanny,
See an earlier post by Will Penny on how to perform conjunction
analysis at the 2nd level:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind04&L=SPM&P=R187333
Best,
Bram
On May 25, 2009, at 10:33 AM, Tiffany wrote:
> On 1st level, conjunction analysis is done by highlighting two
> contrasts in the
> results part. But I have problem with doing conjunction analysis on
> the 2nd
> level as there is no new con files generated from the 1st level for
> the
> conjunction.
>
> My case is like this:
> on 1st level, I have the con files of : A1-A2 ; B1-B2 for each
> subject
> on 2nd level, I want to do conjunction of : A1-A2 Vs B1-B2 for all
> subjects
>
> Since on 2nd level the con files of A1-A2, B1-B2 are at different
> folders after
> doing 1-sample t-tests of the constrasts, I couldn't select the two
> contrast
> simultaneously.
>
> I've also tried to use paired sample t-test with con files of A1-A2
> & B1-B2, but
> the error message appeared : "There is no significant voxels" and the
> estimation process stopped.
>
> Could anyone tell me how to perform conjunction analysis at the 2nd
> level?
> Thanks a lot!
>
> Tiffany
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