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<DIV><FONT face=Arial size=2>Rita-</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Check to see if when you manually invert
EEG.icawinv (the inverse of the weight matrix) that you get or don't get any
singularity warnings.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As you said, there is a dependency
there.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I personally would prefer to leave the A1 A2
references in there for localization purposes however then there is this
trade-off you speak of. It also seems wrong to just remove one of the
reference channels (A2) and then look at the spatial maps because we lose
electrode symmetry. Maybe the solution is to use A1 and A2 for data at
acquisition time and use the inion or the naison as the reference.
Comments??</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Phil Zeman</FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
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=rceponiene@crl.ucsd.edu href="mailto:rceponiene@crl.ucsd.edu">Rita
Ceponiene</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</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> Thursday, June 02, 2005 3:43
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Eeglablist] reference one more
time</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I wonder whether it is better to
use a single-mastoid referenced data or average-mastoid referenced data when
training </SPAN></FONT><st1:City><st1:place><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ICA</SPAN></FONT></st1:place></st1:City><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> on
continuous <SPAN class=GramE>data?</SPAN> When one mastoid is used for the
reference, another mastoid is typically left in the dataset – can this induce
a bias in the component configuration, especially over the back of the head?
On the other hand, when average of both mastoids is used, both channels have
data in them, which is, however, 100% correlated and smaller in magnitude than
data on other channels. Will this affect
</SPAN></FONT><st1:City><st1:place><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ICA</SPAN></FONT></st1:place></st1:City><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> or not
(since the manipulation was linear)? If it will, should both mastoid channels
be deleted from the data?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thank
you—<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Rita <SPAN
class=SpellE>Ceponiene</SPAN> <SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></FONT></P></DIV>
<P>
<HR>
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