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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Dear Bornali,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><br>
This is more of a statistical methods question. </span>I'm interested in
doing test-retest evaluation in a data set and, most specifically, formally
assessing my intuition that there are stable individual differences in the ERSP
associated with performing a certain task, such that the overall
"pattern" of one subject's ERSP is highly replicable, and thus
reliably different from the ERSPs of other subjects. Is the fieldtrip
cluster-based permutation test a suitable procedure for implementing this
test? Has anyone done this type of analysis already? Any advice
would be appreciated.<span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Yes,
it is straightforward to do this type of analysis in Fieldtrip. This is a so-called
between-trials analysis. Your independent variable is SUBJECT, with levels the
different subjects in your study. You can do this analysis for every pair of
subjects (using statfun=indepsamplesT) or for all subjects jointly (using
statfun=indepsamplesF). <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>You
will be testing the null hypothesis that there are no differences between subjects
(or, in reliability terminology, that there are no reliable individual differences).
This is a strict null hypothesis. However, it will definitely be of interest to
see where the individual differences are most pronounced; on which regions of
the scalp, on which time points relative to some stimulus, and in which frequency
bands.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Good luck,<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Eric
Maris<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>dr. Eric Maris<br>
Donders Institute for Brain, Cognition and Behavior<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Center for Cognition and F.C. Donders Center for Cognitive
Neuroimaging<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Radboud University</span><span lang=EN-US style='font-size:11.0pt;
font-family:"Verdana","sans-serif";color:#1F497D'><br>
</span><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>P.O. Box 9104</span><span lang=EN-US style='font-size:11.0pt;
font-family:"Verdana","sans-serif";color:#1F497D'><br>
</span><span lang=EN-GB style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>6500 HE Nijmegen<br>
The Netherlands<br>
T:+31 24 3612651<br>
Mobile: 06 39584581<o:p></o:p></span></p>
<p class=MsoNormal><span lang=DE style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>F:+31 24 3616066<br>
E: e.</span><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><a href="mailto:e.maris@donders.ru.nl"
title="blocked::mailto:maris@nici.kun.nl"><span lang=DE>maris@donders.ru.nl</span></a></span><span
lang=EN-US style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><br>
<br>
Thanks so much,<br>
<br>
Bornali<br>
<br clear=all>
<br>
-- <br>
Medical Scientist Training Program<br>
Neuroscience Training Program<br>
University of Wisconsin - Madison<br>
Health Emotions Research Institute<br>
</span><a href="mailto:bkundu@wisc.edu"><span lang=EN-US>bkundu@wisc.edu</span></a><span
lang=EN-US><o:p></o:p></span></p>
<p>----------------------------------<o:p></o:p></p>
<p>The aim of this list is to facilitate the discussion between users of the
FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and
EEG analysis.<o:p></o:p></p>
<p>http://listserv.surfnet.nl/archives/fieldtrip.html<o:p></o:p></p>
<p>http://www.ru.nl/fcdonders/fieldtrip/<o:p></o:p></p>
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<p>----------------------------------</p>
<p>The aim of this list is to facilitate the discussion between users of the FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis.</p>
<p> http://listserv.surfnet.nl/archives/fieldtrip.html</p>
<p> http://www.ru.nl/fcdonders/fieldtrip/</p>