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Johanna - I think G is "safe" to use - I don't think there are any special considerations, apart from overall scaling. In other words, I don't know what the scaling of the units is (you could consult the Brainstorm package that SPM5 uses for forward modelling), but I don't think the scaling of the units is terribly important for the kind of work we do. Rik > Hello folks, > > I have just began using SMP5. I'd like to programme an inverse solution > using the gain matrix, G, created by forward computations. I'd like to > know if the G, used by the function spm_eeg_inv_evoked, assumes units Am > for current and V for signal? And is it other wise "safe" to be used just > as any gain matrix, or should I take something special into consideration? > > Thanks for any answers, > Johanna > -- ------------------------------------------------------- DR RICHARD HENSON MRC Cognition & Brain Sciences Unit 15 Chaucer Road Cambridge, CB2 7EF England EMAIL: [log in to unmask] URL: http://www.mrc-cbu.cam.ac.uk/~rik.henson TEL +44 (0)1223 355 294 x522 FAX +44 (0)1223 359 062 MOB +44 (0)794 1377 345 -------------------------------------------------------