[Eeglablist] Removing EOG artefact using ICA and converting backto EEG channels

[Jorge Del Rio]

Ciao Miklos,

Then the question would be, why to use 64 electrodes instead of 63, because after removing one component, the resulting space is N-1 dimension... (being N the number of electrodes).

Best Regards!,
Jorge
_____________________________
MSc Engineer... whatever it means
_____________________________
  ----- Original Message ----- 
  From: Miklos Argyelan 
  To: Vuckovic, Aleksandra 
  Cc: eeglablist at sccn.ucsd.edu 
  Sent: Sunday, March 05, 2006 2:53 AM
  Subject: Re: [Eeglablist] Removing EOG artefact using ICA and converting backto EEG channels


  Hi Alexandra,

  If I understand your problem correctly, the only thing you have to do is to overwrite with zeros that component which you would like to discard. After this you can make the inverse transformation.

  Miklos

  -- 
  Miklos Argyelan MD, MSc

  SUNY Downstate Medical Center
  450 Clarkson Ave, New York, NY, 11203
  tel: +1-718-270-2975


  On 3/2/06, Vuckovic, Aleksandra <vuckovic at essex.ac.uk> wrote:
    Hello,

    I would like to remove eye movement artefacts from EEG signals. I saw
    that ICA is very efficient in it. However I would like to work on EEG
    data not on ICA components. I have 64 channels EEG. So when I perform 
    ICA, EOG will be one component which I can discard. However if I now
    want to perform inverse transformation I have a problem: 63 ICA
    components and 64 EEG channels. Does anybody have a suggestion how to
    solve the problem? Would it help adding a dummy component of a constant 
    value around 0, and then performing inverse ICA?

    Thanks a lot in advance!

    Aleksandra Vuckovic

    _______________________________________________
    eeglablist mailing list eeglablist at sccn.ucsd.edu
    Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
    To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu








------------------------------------------------------------------------------


  _______________________________________________
  eeglablist mailing list eeglablist at sccn.ucsd.edu
  Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
  To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20060305/90bcd4e6/attachment.html>