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Dear Emilie, SPM cannot recognise the Biosemi system based on just 22 channels. You will find all your channels in the 'Other' tab but if you want them to be recognised as EEG you should change their channel type manually in 'Prepare' tool and if you need channel locations you need to load them manually from the file in EEGtemplates directory. See the manual for more details. Best, Vladimir On 11 Feb 2013, at 17:40, Emilie <[log in to unmask]> wrote: > Dear SPMers, > > I thank you for your reading, > > I'm trying to analyze my data (EEG Acquisition via Biosemi). But I have a problem : after converting the file, I cannot visualized them. I have an error message saying "No Channels of this type in the SPM data file !" (see attachment). I have asked to many people, but nobody can tell me what's happen. > In order to have a comparison point, I tried with the subject1.bdf file (in the tutorial) because it's also with Biosemi system. In that case, I (of course) have no errors. > > The only difference that I have is in the output on the Matlab window. > For the subject1.bdf, I have : > > checkmeeg: no channel type, assigning default > checkmeeg: no units, assigning default > checkmeeg: transform type missing, assigning default > checkmeeg: data type is missing or incorrect, assigning default > creating layout from cfg.elec > creating layout for biosemi128 system > > > And for my file, I have only that (without the last sentences) > checkmeeg: no channel type, assigning default > checkmeeg: no units, assigning default > checkmeeg: transform type missing, assigning default > checkmeeg: data type is missing or incorrect, assigning default > > > Maybe another difference is that I saved 22 electrodes (on 64). > > Thank you in advance, > > Emilie Caspar > > <Capture d’écran 2013-02-11 à 17.48.27.png> > > --------------------------------------------- > Emilie Caspar > > Aspirante FNRS - Ph.D. Student > > Consciousness, Cognition & Computation Group (CO3) > Centre de Recherche Cognition et Neurosciences (CRCN) > ULB Neurosciences Institute (UNI) > > Université Libre de Bruxelles > Av. F.-D. Roosevelt, 50 > 1050 Bruxelles > BELGIUM > > Voice : +32 2 650 32 95 > mail : [log in to unmask] > office: DB10-138 >