problem with brain vision data import?

Michael Wibral wibral at BIC.UNI-FRANKFURT.DE
Thu Aug 27 12:32:35 CEST 2009


Dear Paolo,

as far as I recall there should be functions to read brain vision recorder files directly into fieldtrip, i.e. you can read the .egg/.vhdr, etc. files with fieldtrip functions like definetrial.m, read_fcdc_data.m and preprocessing.m  . There is no need to export to matlab first. As another workaround you could use the bvaimport functions of eeglab, cut things into trials, perhaps clean the data there and then save an eeglab .set file and read this into fieldtrip using the eeglab2fieldtrip.m function.

Michael
 

> -----Urspr√ľngliche Nachricht-----
> Von: "Paolo Toffanin" <P.Toffanin at RUG.NL>
> Gesendet: 27.08.09 12:04:32
> An: FIELDTRIP at NIC.SURFNET.NL
> Betreff: [FIELDTRIP] problem with brain vision data import?


> Dear fieldtrippers, 
> 
> I  tried to search the list archive to see if somebody has encountered 
> previously this problem but I was not successful, so if this issue has been 
> already treated please address me to the solution.
> 
> The problem is this. I'm loading into fieldtrip data recorded with brain vision 
> recorder (BVR). However, I've noticed that the scales are different (see the 
> attached pdf file), the one observed when exported from brain vision analyzer 
> (BVA) seems 'smaller' than the one imported directly from BVR. Why is that? Is 
> this a problem?
> 
> My hope is that I won't have to use BVA anymore, even if just to export the 
> data from there to matlab. Is this possible? 
> 
> The code I've used to import the data is also attached. (Data were exported 
> from BVA as binary float 32)
> 
> I hope I'm just missing a preprocessing step, but I'm not sure, could you 
> please give me some indications?
> 
> Thank you very much, 
> Paolo
> 
> ----------------------------------
> 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.
> 
> 



----------------------------------
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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