[Eeglablist] rereferencing and epochs

[David Groppe]

On Tue, 29 Jul 2008, Skotara wrote:

> Hello everybody,
>
> sorry for my basic questions. I am a beginner in eeglab and try to
> figure out some basic functions in eeglab. I like to adjust them to my
> needs.
>
> Is it possible to rereference the data using one of my channels such
> that the rereferenced dataset would be referenced against the new
> channel divided by 2?
> resulting channel = old channel - (specific channel / 2)
> By using 'reref' I wasnt able to do this..

Hi Skotora,
   I have short function for re-referencing data to a bi-mastoid reference 
that does what you need.

http://www.cogsci.ucsd.edu/~dgroppe/EEGLAB/reref_bimastoid.m

Just enter the index of the "specific channel" 
where the function calls for the right mastoid index and it should do the 
trick.

As alternative,Arno Delorme explained how to do this within EEGLAB a few 
weeks ago.  Just search the EEGLAB mailing list archives (2008) for 
"Groppe" and you'll find the thread.
   cheers,
      -D



> How can I extract epochs by using conditional expressions such as:
> Extract all epochs after event-code x but only if event-code y is
> following within the next z ms?
>
> Have you any ideas, why 'h' instead of 'EEG.history' doesnt work on my
> computer?
>
> Thank you very much in advance!
> Best regards,
> Nils
>
>
>
>
> -- 
> Dipl. Psych. Nils Skotara
> Universität-Hamburg
> Biologische Psychologie und Neuropsychologie - BPN
> Von-Melle-Park 11
> 20146 Hamburg
> Telefon: (+49)-(0)40/42838-3218
> E-Mail: nils.skotara at uni-hamburg.de
> http://www.bpn.uni-hamburg.de/Skotara.html
>
> --
> Universität Hamburg
> Sonderforschungsbereich 538: Mehrsprachigkeit
> Max-Brauer-Allee 60
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> Germany
> -
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> http://www.uni-hamburg.de/fachbereiche-einrichtungen/sfb538/nilsskotara.htm
>
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