cluster analysis and EEG channel information

Nathan Weisz nathanweisz at MAC.COM
Tue Sep 16 22:15:38 CEST 2008


dear shen-mou,

actually - if i remember correctly (long time ago) - after running
eeglab2fieldtrip there should be a field in your exported data
structure called elec. this should have the electrode info.

otherwise you could read the electrode info using read_fcdc_elec. then
add the field by hand.

for clustering electrodes you need to specify a neighbourhood-
structure. take a look at statistics_montecarlo and the comments on
cfg.neighbours.
look also at the function neigbourselection. basically you could also
create that structure by hand.

good luck,
nathan

On 16.09.2008, at 17:06, Hsu, Shen-Mou wrote:

> Dear Users,
>
>
> I preprocessed my EEG data using EEGLAB and then converted the data
> into the fieldtrip format using eeglab2fieldtrip. However, I noticed
> that in cfg.channel, there are only labels without any information
> about electrode locations. I was wondering if this is OK to run
> cluster analysis.  Besides, I also wondered how to specify the
> configuration-"cfg.channel" in this case.
>
> Many thanks in advance,
>
> Shen-Mou
>
> ----------------------------------
> 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.

--------------------------------------------
Attention: New Contact Details
--------------------------------------------
Dr. Nathan Weisz

OBOB-Lab
University of Konstanz
Department of Psychology
P.O. Box D23
78457 Konstanz
Germany

Tel: ++49 - (0)7531 - 88 45 84
Email: nathan.weisz at uni-konstanz.de
Homepage: http://www.uni-konstanz.de/obob

"Nothing shocks me. I'm a scientist." (Indiana Jones)


----------------------------------
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.
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