<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered medium)">
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="place"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="City"/>
<!--[if !mso]>
<style>
st1\:*{behavior:url(#default#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Bookman Old Style";
panose-1:2 5 6 4 5 5 5 2 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0pt;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
span.E-mailStijl17
{mso-style-type:personal;
font-family:Arial;
color:windowtext;}
span.E-mailStijl18
{mso-style-type:personal-reply;
font-family:"Bookman Old Style";
color:blue;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
@page Section1
{size:595.3pt 841.9pt;
margin:70.85pt 70.85pt 56.7pt 70.85pt;}
div.Section1
{page:Section1;}
/* List Definitions */
@list l0
{mso-list-id:324863325;
mso-list-type:hybrid;
mso-list-template-ids:-300902912 67567631 67567641 67567643 67567631 67567641 67567643 67567631 67567641 67567643;}
@list l0:level1
{mso-level-tab-stop:36.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:72.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:108.0pt;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:144.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level5
{mso-level-tab-stop:180.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level6
{mso-level-tab-stop:216.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level7
{mso-level-tab-stop:252.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level8
{mso-level-tab-stop:288.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level9
{mso-level-tab-stop:324.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1
{mso-list-id:1425374393;
mso-list-template-ids:1237596368;}
@list l1:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:72.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
ol
{margin-bottom:0pt;}
ul
{margin-bottom:0pt;}
-->
</style>
</head>
<body lang=NL link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'>Hi Nina,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0pt 0pt 0pt 4.0pt'>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I have two questions regarding clusteranalysis.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0pt' start=1 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo3'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>When running
‘freqstatistics’ on time frequency/frequency data with the
method ‘montecarlo’ which clusterthreshold would you use? I
would think that with the data usually not being normally distributed you
would use a nonparametric threshold. However, the default value for
clusterthreshold is ‘parametric’.<o:p></o:p></span></font></li>
</ol>
<ol style='margin-top:0pt' start=1 type=1>
<ol style='margin-top:0pt' start=1 type=a>
<li class=MsoNormal style='mso-list:l0 level2 lfo3'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Is there
documentation about what ‘nonparametric_individual’ and
‘nonparametric_common’ mean? If yes, where can I find it?<o:p></o:p></span></font></li>
</ol>
</ol>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'>You
can safely use the parametric threshold, regardless of the probability
distribution of your data. The reason is that this threshold only affects the
type of effect for which you test statistic is sensitive. The false alarm rate
does not depend on it. See Maris & Oostenveld (2007).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'>You
only use the two other clusterthreshold options if you use a non-normalized
channel-level statistic. If you construct clusters by thresholding channel-level
T-statistics, go ahead with the parametric threshold.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:blue'> </span></font><font
size=1 face=Verdana><span lang=EN-US style='font-size:9.0pt;font-family:Verdana'><o:p></o:p></span></font></p>
<ol style='margin-top:0pt' start=2 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo3'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>I am looking at data
from our old Neuromag 122 system and used the function
‘neighbourselection’ to define neighbouring channels. When
checking what ‘neighbourselection’ did I found that the
neighbours identified were not only the sensors surrounding the sensor of
interest, but also sensors lying far away from it. Also, not all sensors
surrounding the one of interest were included as neighbours. I used the
gradfile generated by ‘mne2grad122’ as cfg.grad and different
values for neighbourdist (4 and 3). Does anybody have a solution for this?
<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'>I
guess Neuromag 122 system has planar gradiometers. For this sensor
configuration, the definition of a neighbourhood-metric requires some thinking
(because you are actually measuring spatial gradients with different
orientations). I contributed to a recent thread on the Fieldtrip Discussion
list about cluster-based permutation tests for the Vectorview system. If I’m
not mistaken, a scientist from an imaging center in <st1:City w:st="on"><st1:place
w:st="on">Paris</st1:place></st1:City> initiated this thread. Have a look in
the archive of the Fieldtrip Discussion list (keywords: planar, cluster,
Vectorview).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'>Good
luck,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span lang=EN-US style='font-size:
9.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-US style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face="Bookman Old Style"><span
lang=EN-GB style='font-size:12.0pt;font-family:"Bookman Old Style";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Thanks in advance for your help!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Nina<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
</div>
</div>
</body>
</html>
<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>
<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>