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Dear Duncan, Changing the channel type to 'Other' should do the job. Just make sure that you save the dataset properly (either do save(D) in a script or press the 'Save' button in the GUI). If you change the channel type and you then open the dataset again in the reviewing tool there should not be any channels with 'EEG' type there. Vladimir On Tue, Oct 12, 2010 at 3:37 PM, Duncan Astle <[log in to unmask]> wrote: > Dear all...... > > So I am attempting to do a group invertion with my MEG data. Everything seems to be working fine, apart from for 3 of the participants' data sets. For these I think it is trying to use the 'EEG channels' - but there arn't any, and ultimately the invertion fails. It thinks this because there was an one electrode marked as an EEG electrode. I have tried changing the channel information, so that it is listed as 'other', but it still doesn't work. > > Could some one clever please help me find out why it thinks that there are EEG channels, and how to stop it. The other participants' data seem to work fine...... > > Many thanks, > Duncan >