Export EEG Data

Matthias C. Meyer Matthias.Meyer at DONDERS.RU.NL
Fri Jun 25 11:24:04 CEST 2010

Dear ft_Community,

I am quite new to Fieldtrip and hope that someone has solved my problem
I recorded EEG data inside an MR Scanner with the BrainVision software
and now I want to use Fieldtrip to run some error correction scripts -
so far so god.
But after that I need to write the corrected data back to the original
EEG - data format.
I use the ft_write_data function to do this. After some problems I
manage to run the function, but the result is a double size datafile, a
messed up header and a empty marker file.
Probably the data is written in double precision. Giving the data to the
function with "single(data_org.trial{1})" in the argument does not help.
The command line I use to call the function is:
ft_write_data('ScannerCor', data_org.trial{1}, 'dataformat',
'brainvision_eeg','header', data_org.hdr);

(I copied the corrected data back to the read in matrix)

I heard already, that I can tell Matlab to use only single precision,
but it would be nice to tell that the function directly - Is there a way
to do so?
What do I need to do, to export the header and marker file correctly?

The corrected data are exactly of the same size as the original data, if
possible, I might also use the original marker file to get the trigger

I hope some one can help me.

Best regards,


The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.

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