Hello SPMers! I'm trying to make my first DCM model for ERP and I'd like to clarify some moments:
1)My ECD model was done using ERP grand average data for more than 50 subjects, so can I apply this grand average data to SPM or I should choose only one person from my study?
2)My ECD model contains both single and regional dipoles though residual variance is rather good, so is it applicable for DCM study?
3)The quantity of dipoles is 8, so the model may be too complex - is it possible to throw away those sources, in which I'm not interested in? (to compare models with different connections)
Thank you very much!