[FieldTrip] Antw: Re: loading brainvision data

[Gregor Volberg]

Hi Brian, 

Johanna is correct - manually editing the file names in Brainvision eeg data often causes problems. This is because the original name of the EEG data file ('*.eeg') and the corresponding marker file ('*.vmrk') are both stored within the header file ('*.vhdr'), and these information won't change accordingly if you rename the files on your hard disk. If the original data name is not available to re-rename the files on your hard disk, you can see them in the *.vhdr-file (5th and 6th row of the vhdr file, just open it with a text editor).  Alternatively, you can edit the file name information within the vhdr-file to match the file names on your hard disk. 

Best regards, 
Gregor 




-- 
Dr. rer. nat. Gregor Volberg <gregor.volberg at psychologie.uni-regensburg.de> ( mailto:gregor.volberg at psychologie.uni-regensburg.de )
University of Regensburg
Institute for Experimental Psychology
93040 Regensburg, Germany
Tel: +49 941 943 3862 
Fax: +49 941 943 3233
http://www.psychologie.uni-regensburg.de/Greenlee/team/volberg/volberg.html


>>> Johanna Zumer <johanna.zumer at donders.ru.nl> 9/22/2011 11:48 AM >>>
Hi Brian, 

Also I noticed in your error you have '-kop' in the file name but not in the dataset name. I've noticed that one can't change the file name of .eeg files (e.g. copying them to a new file name) and then still load them; you should stick to the original name as it was given when collected. 



Best, 

Johanna


On 22 September 2011 11:38, <B.Mouthaan at neuro.umcn.nl> wrote:



Hello Fieldtrippers,

Hello Fieldtrippers,

For an assignment during my internship at the Radboud UMC, I want try to use fieldtrip for Beamforming at Auditory Evoked Potentials.
However the first step is unsuccesful. I try to load *.eeg , *.vhdr , *.vmrk and *.avr files but I receive multiple errors.

I also tried to use the example script in the tutorial. However this doesn't work either. I get errors like:


??? Error using ==> ft_read_header at 86
file or directory 'heineken000003-kop.eeg' does not exist

Error in ==> trialfun_general at 55
hdr = ft_read_header(cfg.headerfile, 'headerformat', cfg.headerformat);

Error in ==> ft_definetrial at 161
[trl, event] = feval(cfg.trialfun, cfg);


Especially the directory error pops up frequently. I don't have a clue.
My script is like this:

cfg = [];

cfg.datafile = 'heineken000003.eeg';
cfg.headerfile = 'heineken000003.vhdr'

cfg.trialdef.eventtype = '?';

ft_definetrial(cfg)


Can anyone help me? FIY I lack experience of working with EEG and fieltrip, but I work with Matlab regularly.

Hope to hear from you!

Brian Mouthaan 


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The Radboud University Nijmegen Medical Centre is listed in the Commercial Register of the Chamber of Commerce under file number 41055629.
 


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