[FieldTrip] request for 4d users

Gopakumar Venugopalan venug001 at crimson.ua.edu
Thu Nov 8 18:21:53 CET 2012

Dear JM, I have simultaneously recorded EEG/MEG data using 4D. Yes they use
the 10-20 (or some variant thereof) system for EEG. This information can be
extracted from the headers, and it is possible to relabel the channel
locations in EEGLAB, and it is also possible to replace the standard xyz
coordinates, with the coordinates from your own individual xyz
file--generated by 4D (using Polhemus). Hope to hear from you.

warm regards

On Wed, Oct 31, 2012 at 4:03 AM, jan-mathijs schoffelen <
jan.schoffelen at donders.ru.nl> wrote:

> 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,
> JM
> 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
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20121108/b285f3c5/attachment-0001.html>

More information about the fieldtrip mailing list