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Dear SPM's users, When we construct a specific DCM model, we should specify different kinds of connections to those sources, but: 1. I wonder that whether the lateral connections only exist between the sources which are in the same level ? And, what does ' the same level ' mean ? Does it mean the two regions own the same function, such as the left visual region and the right visual region ? 2. Does forward connections only exist between the sources which are in the different level ? Such as low-level and the high-level ? 3. Do backward connections are always generate from high-level regions and terminate in those low-level regions ? All in a word, how could we specify the different connections among those sources ? Any help will be appreciated. -- Haoran LI (MS) Brain Imaging Lab, Research Center for Learning Science, Southeast University 2 Si Pai Lou , Nanjing, 210096, P.R.China