[FieldTrip] Cannot read the events of a .BDF file exported from an EGI .RAW

[Lozano Soldevilla, D. (Diego)]

Dear Ana, Sorry for my file extension confusion: edf instead of bdf. However, I don't know a way to read events coded in BDF format exported by NETSTATION. I encounter this problem in the past but I had no problems with RAW file format Dear Chungki , Fieldtrip can read events in *.bdf but from BIOSEMI eeg system but Ana was refering to a different eeg system that has the same fileformat extension. best, Diego ----- Original Message -----
> From: "Chungki Lee" <dr.chungki.lee at gmail.com>
> To: "FieldTrip discussion list" <fieldtrip at science.ru.nl>
> Sent: Monday, 26 May, 2014 11:18:34 AM
> Subject: Re: [FieldTrip] Cannot read the events of a .BDF file
> exported from an EGI .RAW
> Dear all
> Fieldtrip can read events in BDF format !
> Hear simple examples
> example #1
> %%
> cfg = [];
> cfg.dataset = '~~~ '; % your filename with file extension;
> cfg.trialdef.eventtype = 'STATUS'; % Status notation maybe Biosemi's
> tigger name
> cfg.trialdef.eventvalue = 1; % your event value
> cfg.trialdef.prestim = 4; % before stimulation (sec), only use
> positive value
> cfg.trialdef.poststim = 8; % after stimulation (sec) , only use
> positive value
> cfg = ft_definetrial(cfg);
> cfg.method = 'trial';
> data = ft_preprocessing(cfg);
> %%
> example #2
> %%
> % if you executed these command lines
> cfg = [];
> cfg.dataset = '~~~ '; % your filename with file extension;
> cfg.trialdef.eventtype = '?'; % Status notation maybe Biosemi's tigger
> name
> cfg = ft_definetrial(cfg);
> % result example #2
> the following events were found in the datafile
> event type: 'CM_in_range' with event values:
> event type: 'Epoch' with event values:
> event type: 'STATUS' with event values: 1 2 3 4 255 <----------- "this
> indicate your file configuration for trigger information"
> no trials have been defined yet, see FT_DEFINETRIAL for further help
> found 255 events
> created 0 trials
> the call to "ft_definetrial" took 8 seconds
> have fun~!!
> 2014-05-26 17:58 GMT+09:00 Diego Lozano Soldevilla <
> d.lozanosoldevilla at fcdonders.ru.nl > :
> > Hi Ana,
> > Fieldtrip does not read events in BDF format. Take a look to our
> > wiki:
> > http://fieldtrip.fcdonders.nl/getting_started/egi
> > •
> > EDF+ (.edf) All channels, including PIB channels, are read in
> > correctly, including channel labels. However, the events, which are
> > stored on the annotation channel, are written in a way by Net
> > Station
> > that is not compatible with the edf+ reading implementation in
> > FieldTrip. So, events do not come out properly. Also discontinuous
> > epochs are “glued” together as one “continuous” data stream.
> > As Arjen suggested, with *.RAW you shouldn't have any problem.
> > event = ft_read_event('*.RAW')
> > If you encounter it, please let us know.
> > best,
> > Diego
> > On 26 May 2014 08:59, Arjen Stolk < a.stolk8 at gmail.com > wrote:
> > > Hi Ana Laura,
> > > Have you tried importing the .RAW file directly? That is, by
> > > specifying cfg.dataset = 'XXX.raw'?
> > > Best regards,
> > > Arjen
> > > 2014-05-26 2:30 GMT+02:00 Ana Laura Diez Martini <
> > > diezmartini at gmail.com > :
> > > > Hi all!
> > > > This is the .BDF file of one of my EEG subjects. For my last
> > > > experiment I used a Biosemi system and now I'm using an EGI
> > > > system
> > > > which gives me .RAW files. I exported the .RAW file with EEGlab
> > > > to
> > > > .BDF format and I tried using the scripts I use to analise the
> > > > data
> > > > of
> > > > my previous experiment but I realised that it was not reading
> > > > the
> > > > events:
> > > > cfg = [];
> > > > cfg.dataset = ' (location)';
> > > > cfg.trialdef.eventtype = '?';
> > > > definetrial(cfg);
> > > > Warning: no trialfun was specified, using trialfun_general
> > > > > In definetrial at 79
> > > > evaluating trialfunction 'trialfun_general'
> > > > no events were found in the datafile
> > > > no trials have been defined yet, see DEFINETRIAL for further
> > > > help
> > > > found 0 events
> > > > created 0 trials
> > > > EEGlab does read them. Any idea of what could be wrong?
> > > > Thank you all!!
> > > > _______________________________________________
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> --
> ----------------------------------------------------------------
> Chungki Lee, Ph.D.
> Post-doc
> Biomedical Research Institute
> Korea Institute of Science and Technology
> E-mail: chungki at kist.re.kr
> Tel:+82-2-958-5636, C.P: +82-10-5223-7309
> ----------------------------------------------------------------
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-- PhD Student Neuronal Oscillations Group Donders Institute for Brain, Cognition and Behaviour Centre for Cognitive Neuroimaging Radboud University Nijmegen NL-6525 EN Nijmegen The Netherlands http://www.ru.nl/people/donders/lozano-soldevilla-d/
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