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<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006>Dear Valdimir,</SPAN></FONT></DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006></SPAN></FONT> </DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006>OK. I had been asking, because coherence (and also
power) have a bias that is sample size dependent. For those measures,
particularly for coherence, I would suggest to use equal sample
sizes.</SPAN></FONT></DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006></SPAN></FONT> </DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006>As far as I can judge, this problem is not there for
amplitude.</SPAN></FONT></DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006></SPAN></FONT> </DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006>Then it is to the cluterrandanalysis experts to help
you with that particular analysis.</SPAN></FONT></DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006></SPAN></FONT> </DIV>
<DIV align=left dir=ltr><FONT color=#0000ff face=Arial size=2><SPAN
class=594314409-27022006>Best, Pascal</SPAN></FONT></DIV><BR>
<BLOCKQUOTE
style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
<DIV align=left class=OutlookMessageHeader dir=ltr lang=en-us>
<HR tabIndex=-1>
</DIV><FONT face=Tahoma size=2><B>From:</B> FieldTrip discussion list
[mailto:FIELDTRIP@NIC.SURFNET.NL] <B>On Behalf Of </B>Vladimir
Litvak<BR><B>Sent:</B> Monday, February 27, 2006 10:13 AM<BR><B>To:</B>
FIELDTRIP@NIC.SURFNET.NL<BR><B>Subject:</B> Re: [FIELDTRIP] Activation vs.
baseline<BR></FONT><BR>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT color=navy face=Arial size=2><SPAN
style="COLOR: navy; FONT-FAMILY: Arial; FONT-SIZE: 10pt">Amplitude at the
sensor level.</SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy face=Arial size=2><SPAN
style="COLOR: navy; FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy face=Arial size=2><SPAN
style="COLOR: navy; FONT-FAMILY: Arial; FONT-SIZE: 10pt">Vladimir</SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy face=Arial size=2><SPAN
style="COLOR: navy; FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Tahoma size=2><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> FieldTrip
discussion list [mailto:FIELDTRIP@NIC.SURFNET.NL] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Pascal Fries<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, February 27, 2006 11:05
AM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
FIELDTRIP@NIC.SURFNET.NL<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [FIELDTRIP] Activation vs.
baseline</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT color=blue face=Arial
size=2><SPAN style="COLOR: blue; FONT-FAMILY: Arial; FONT-SIZE: 10pt">Dear
Vladimir,</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT color=blue face=Arial
size=2><SPAN style="COLOR: blue; FONT-FAMILY: Arial; FONT-SIZE: 10pt">what
aspect of the two data pieces are you comparing? Power? Coherence? Amplitude?
At the sensor or at the source level?</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT color=blue face=Arial
size=2><SPAN style="COLOR: blue; FONT-FAMILY: Arial; FONT-SIZE: 10pt">Best,
Pascal</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P style="MARGIN-LEFT: 0.5in"><FONT color=blue face=Arial size=2><SPAN
style="COLOR: blue; FONT-FAMILY: Arial; FONT-SIZE: 10pt"><!-- Converted from text/plain format -->Pascal
Fries<BR>Principal Investigator<BR>Neuronal Coherence Group<BR>F. C. Donders
Centre for Cognitive Neuroimaging<BR>Radboud University
Nijmegen<BR><BR>Kapittelweg 29<BR>6525 EN Nijmegen<BR>The
Netherlands<BR><BR>Phone: (+31) (0)24 36 10657<BR>Fax: (+31) (0)24
36 10989<BR>e-mail: pascal.fries@fcdonders.ru.nl<BR>website:
www.ru.nl/fcdonders/ </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<BLOCKQUOTE
style="BORDER-BOTTOM: medium none; BORDER-LEFT: blue 1.5pt solid; BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN: 5pt 0in 5pt 3.75pt; PADDING-BOTTOM: 0in; PADDING-LEFT: 4pt; PADDING-RIGHT: 0in; PADDING-TOP: 0in">
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<DIV align=center class=MsoNormal
style="MARGIN-LEFT: 0.5in; TEXT-ALIGN: center"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">
<HR align=center SIZE=2 width="100%">
</SPAN></FONT></DIV>
<P class=MsoNormal
style="MARGIN-BOTTOM: 12pt; MARGIN-LEFT: 0.5in; MARGIN-RIGHT: 0in"><B><FONT
face=Tahoma size=2><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt">
FieldTrip discussion list [mailto:FIELDTRIP@NIC.SURFNET.NL] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Vladimir
Litvak<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday,
February 27, 2006 9:24 AM<BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B>
FIELDTRIP@NIC.SURFNET.NL<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [FIELDTRIP] Activation vs.
baseline</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Dear Eric and
all,</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I’m playing with ‘Activation vs.
baseline’ option in clusterrandanalysis. The problem is that my baseline is
about 100ms while the activation period is 300 ms. I cannot extend the
baseline since the raw data I have is already segmented. What is the right
thing to do in this situation? Should I divide the activation period into 3
segments and test them separately? Or maybe replicate the baseline 3 times,
concatenate and use this as baseline for the whole period?
</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Thanks,</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Vladimir</SPAN></FONT></P></BLOCKQUOTE></DIV></BLOCKQUOTE></BODY></HTML>