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Dear Emily, There is a fix in the conversion code that was necessary for the Biosemi used at the FIL where the trigger plug was inverted. I put some conditions on when this fix is applied hopefully that other Biosemi sites will not be affected by it but obviously you were (but it's the first complaint about this in 7 years). Since you know the mapping between your and original codes you can just keep everything is it is. Or you can comment out the lines in spm_eeg_convert after the comment: % This is another FIL-specific fix that will hopefully not affect other sites (this is line 142 in the latest SPM12) Best, Vladimir On Fri, Jun 20, 2014 at 11:24 AM, Emily Hird < [log in to unmask]> wrote: > Dear SPMers, > > > > I wanted to ask about an issue I have experienced in converting EEG data > from Biosemi to SPM. > > The trigger codes are correct in Biosemi. When I convert them in SPM, the > trigger codes don’t correspond. > > SPM is actually reading the binary code from Biosemi backwards, so > producing a weird number, for example 9 ‘00001001’ becomes 144 > ‘10010000’. > > Would you know why this is happening? > > > > Thanks, > > > > Emily Hird > > PhD student > > School of Psychological Sciences > > Zochonis Building, Brunswick Street, Manchester M13 9PT > > >