[FieldTrip] Cannot read the events of a .BDF file exported from an EGI .RAW
Ana Laura Diez Martini
diezmartini at gmail.com
Tue May 27 00:25:39 CEST 2014
Thank you Arjen, Diego and Chungki Lee!
I tried with the .RAW and it reads the event. The problem is that my
triggers have the following format "11,12,13,14,15,21,22...." . Netstation
instead of saving them as they are, returns them in this way: say my
trigger is 12, I get "DIN4" and "DIN8". or 11 is DIN1 + DIN8 + DIN2. so I
had to convert them into my original triggers. After that I can either save
the set (I tried
this<http://sccn.ucsd.edu/pipermail/eeglablist/2010/003611.html> but
it didn't work) or export it to bdf. When I open the exported file in
EEGlab, it reads the events correctly, but fieldtrip doesn't.
Any ideas? Thanks!!
On Mon, May 26, 2014 at 9:44 PM, Lozano Soldevilla, D. (Diego) <
d.lozanosoldevilla at fcdonders.ru.nl> wrote:
> 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
>
> ------------------------------
>
> *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
>>>> <https://www.dropbox.com/s/xu5a9jwefpxnx2v/RAWconTriggers.bdf>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!!
>>>>
>>>>
>>>> _______________________________________________
>>>> fieldtrip mailing list
>>>> fieldtrip at donders.ru.nl
>>>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>
>>
>> _______________________________________________
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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
> ----------------------------------------------------------------
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
>
>
>
> --
> 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/
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
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