[FieldTrip] request for 4d users

jan-mathijs schoffelen jan.schoffelen at donders.ru.nl
Wed Oct 31 08:03:01 CET 2012

Dear community and 4d-users in particular,

I am in the process of implementing more robust support in the fileio module to deal with simultaneous MEG/EEG measurements using the 4D-neuroimaging system. Specifically, I want to improve the reading of EEG electrode positions, when these have been digitized using the Polhemus in combination with the 4D acquisition software. This question has been raised on this list over a year ago by Margit Schönherr (who kindly sent me a dataset to work with: thanks Margit), but it would be really helpful if I could benefit from your knowledge/input. At the moment FT can extract electrode positions from the header, but it is based on reverse engineering based on 1 dataset only. Therefore I would like to ask you whether you could send me some (as small as possible) datasets, which contain digitized electrode positions (in combination with the corresponding config and hs_file). This would be much appreciated.
On a related note, Margit's dataset contained electrode positions in combination with their labels according to the 10/20 convention. Does anybody know whether information is stored in the file-header that links the named electrodes to the generic naming scheme 'E1'...'Ex'?

Thanks for any input,


Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

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