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Dear Mina, I'm not DCM expert but before you get anwers from experts I think this paper could be helpful to answer your questions. Heim S, Eickhoff SB, Ischebeck AK, Friederici AD, Stephan KE, Amunts K (2007) Effective connectivity of the left BA 44, BA 45, and inferior temporal gyrus during lexical and phonological decisions identified with DCM. Hum Brain Mapp. http://www.ncbi.nlm.nih.gov/pubmed/18095285?dopt=Citation Best, Qing Mina Khoshnejad a écrit : > Hello, > > For group analysis in DCM, do we have to select VOI, for each subject > and each run seperately (according to the GLM results for each run)? > It takes a long time to do that, and also there is always variations > across subjects and not all subjects show the excat same pattern. so > the VOI might vary a bit from subject to subject. > > What is the general approach to select VOI for a group DCM? > > Many thanks for your answer in advance. > Mina > > > ------------------------------------------------------------------------ > Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try > it now. > <http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ%20>