Dear SPMers, I've posted the following message a few weeks ago, but couldn't get any reply yet. If more exlanation about the problem is needed, please let me know. We have 2 conditions (A & B) and we want to identify regions that are significantly activated in both. However, when we apply spm2_conj and use the FDR option, we got the following error: ??? Error using ==> spm_uc_FDR n & number of mapped images doesn't match (1,2) It would be really appreciated if you let me know how to solve this problem. Thank you, Hwamee