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Dear Toshi I hope you don't mind CC'ing the SPM mailing list so others can benefit. I assume this is DCM for fMRI? You should indeed have one DCM containing all your conditions, unless there's good reason not to. So yes, I would recommend creating a single model. Feel free to post the details of your task / DCM design if you'd like them scrutinised. Best Peter -----Original Message----- From: Toshi Kawagoe [mailto:[log in to unmask]] Sent: 16 February 2017 04:34 To: Zeidman, Peter <[log in to unmask]> Subject: Re: different DCM results between simple averaging and BPA averaging Dear Peter Thank you for your kind reply. Your explanation was easy to understand. At first, I did option 2 but I did not found the "Contrast of connections" button. I create one DCM file containing one condition. So there are 2 DCM file per a subject because I had 2 conditions. Maybe this way of creating DCM*.mat was not good, was it? Then, should I redo making the DCM .mat file? Thank you. My best, Toshi