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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