Importing 4-D datasets

[Gopakumar Venugopalan]

Thanks Nathan. I did install pdf2set. The 4-D data is not discrimnating
between EEG and MEG as the EEG electrodes were not digitized. So it is
exported as one large 171 channel file. Yes, I guess timelock structure
is where I want to start from then move to Topographic analysis, areal
analysis and dipole fitting.
Would you happen to know how many files pdf2set will export and with
what extensions? I have ascii files of the data sets, I saw an .xyz
file (cartesian coordinates) and an elp file (electrode position) file.
Can I use the last two files in conjunction with the standard 10-20
electrode system position to read in the EEG data?
Thanks, once again, in advance.
Warm regards
gopa


Quoting Nathan Weisz <weisz at LYON.INSERM.FR>:

> hi gopa,
>
> the 4-D software should come with a command line tool called pdf2set.
>
> files exported with this command can be read in a standard fieldtrip
>
> manner. yet this assumes you want to read trials.
> you already averaged the data and probably want a timelockanalysis
> structure. perhaps it is the least pain to read the data (exported
> via
> pdf2set) with eeglab. then do
> dummy = eeglab2fieldtrip(EEG, 'timelockanalysis').
>
> best wishes,
> nathan
>
>
>
>
>
>
> On 10.01.2008, at 20:00, Gopa Venugopalan wrote:
>
> > Hello, I wish everyone a productive New Year! Does anyone have any
> > experience importing 4-D data? I have 146 channels of MEG and 25
> > channels
> > of EEG that I am importing. That data has been preprocessed and
> grand
> > averaged using proprretary 4-D software. All I now need is to
> import
> > the
> > ASCII files containing the averaged data. Thanking everyone in
> > advance for
> > any and all assistance.
> > Warm Regards
> > gopa
> >
> > ----------------------------------
> > 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/fcdonders/fieldtrip.
>
> --------------------------------
> Dr. Nathan Weisz
>
> INSERM - Unité 821
> Dynamique cérébrale et cognition
> Centre Hospitalier Le Vinatier, Bâtiment 452
> 95 Boulevard Pinel
> 69500 Bron, France
>
> Tel: ++33 - (0)4 - 7213 8915
> Email: weisz at lyon.inserm.fr
> Chat-AV: nathanweisz at mac.com
> Homepage: http://web.mac.com/nathanweisz
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>
> Please avoid sending me Word or PowerPoint attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
>
>
>
>
> ----------------------------------
> 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/fcdonders/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/fcdonders/fieldtrip.