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<DIV><FONT face=Arial size=2>Ciao Miklos,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Best Regards!,</FONT></DIV>
<DIV><FONT face=Arial size=2>Jorge</FONT></DIV>
<DIV><FONT face=Arial size=2>_____________________________</FONT></DIV>
<DIV><FONT face=Arial size=2>MSc Engineer... whatever it means</FONT></DIV>
<DIV><FONT face=Arial size=2>_____________________________</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=argyelan@gmail.com href="mailto:argyelan@gmail.com">Miklos
Argyelan</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=vuckovic@essex.ac.uk
href="mailto:vuckovic@essex.ac.uk">Vuckovic, Aleksandra</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=eeglablist@sccn.ucsd.edu
href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, March 05, 2006 2:53
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Eeglablist] Removing EOG
artefact using ICA and converting backto EEG channels</DIV>
<DIV><BR></DIV>Hi Alexandra,<BR><BR>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.<BR><BR>Miklos<BR><BR>-- <BR>Miklos Argyelan MD,
MSc<BR><BR>SUNY Downstate Medical Center<BR>450 Clarkson Ave, New York, NY,
11203<BR>tel: +1-718-270-2975<BR><BR>
<DIV><SPAN class=gmail_quote>On 3/2/06, <B class=gmail_sendername>Vuckovic,
Aleksandra</B> <<A
href="mailto:vuckovic@essex.ac.uk">vuckovic@essex.ac.uk</A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Hello,<BR><BR>I
would like to remove eye movement artefacts from EEG signals. I saw<BR>that
ICA is very efficient in it. However I would like to work on EEG<BR>data not
on ICA components. I have 64 channels EEG. So when I perform <BR>ICA, EOG
will be one component which I can discard. However if I now<BR>want to
perform inverse transformation I have a problem: 63 ICA<BR>components and 64
EEG channels. Does anybody have a suggestion how to<BR>solve the problem?
Would it help adding a dummy component of a constant <BR>value around 0, and
then performing inverse ICA?<BR><BR>Thanks a lot in
advance!<BR><BR>Aleksandra
Vuckovic<BR><BR>_______________________________________________<BR>eeglablist
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