<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Times;
panose-1:2 2 6 3 5 4 5 2 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Vorformatiert Zchn";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
span.HTMLVorformatiertZchn
{mso-style-name:"HTML Vorformatiert Zchn";
mso-style-priority:99;
mso-style-link:"HTML Vorformatiert";
font-family:"Courier New";
mso-fareast-language:DE;}
span.E-MailFormatvorlage19
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.searchhit
{mso-style-name:search_hit;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:329868768;
mso-list-type:hybrid;
mso-list-template-ids:397958276 67567617 67567619 67567621 67567617 67567619 67567621 67567617 67567619 67567621;}
@list l0:level1
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="DE" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Dear Fieldtripper community!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am currently working on a pipeline for EEG data to perform network analysis with Fieldtrip (well documented example in
<a href="http://www.fieldtriptoolbox.org/tutorial/networkanalysis">http://www.fieldtriptoolbox.org/tutorial/networkanalysis</a>). So far, I have successfully adapted the MEG example for performing EEG network analysis with
<i>single subjects</i>, which seems to produce reliable outcomes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">However, I want to perform a group analysis where I want to plot the connectivity of networks from group A with group B. Therefore, a prerequisite is to compute group averages from source data.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">So my question is: Has anyone performed a connectivity and/or network analysis on a group level?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Here is what I have tried out that did not work:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1;text-autospace:none">
<![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Calculating the group mean of the source data with
<i>ft_math</i> after using <i>ft_sourcedescriptives</i>, which caused problems for the connectivity (<i>ft_connectivityanalysis</i>) and subsequent network analysis (<i>ft_networkanalysis</i>)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1;text-autospace:none">
<![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">I also tried <i>ft_sourcegrandaverage</i>, which also is not capable to provide enough (single) trial information for the following connectivity analysis steps.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt;text-autospace:none"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">At the end I took preprocessed EEG data for each subject in my groups and put them together in one dataset using
<i>ft_appenddata</i>, which produces some plausible data. Using this strategy, I tricked the algorithm, so it operates the data thinking it is a single subject. I am concerned whether this could cause methodological issues. Is there another (easier) way to
do this?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Can anyone give me some advice which strategy would be best to calculate the group mean and why?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Cheers and thanks in advance<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE">Nicolas Zink<br>
wissenschaftlicher Mitarbeiter<br>
<span style="color:black;background:white">Universitätsklinikum Carl Gustav Carus</span></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:black;mso-fareast-language:DE"><br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white;mso-fareast-language:DE">Klinik für Kinder- und Jugendpsychiatrie und -psychotherapie</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:DE"><br>
<span style="background:white">Schubertstraße 42</span><br>
<span style="background:white">01307 Dresden</span></span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE"><br>
Tel. +49 (0)351 458-2303<br>
<br>
Universitätsklinikum Carl Gustav Carus<br>
an der Technischen Universität Dresden<br>
Anstalt des öffentlichen Rechts des Freistaates Sachsen<br>
Fetscherstraße 74, 01307 Dresden<br>
</span><a href="http://www.uniklinikum-dresden.de/"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue;mso-fareast-language:DE">http://www.uniklinikum-dresden.de</span></a><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE">Vorstand: Prof. Dr. med. D. M. Albrecht (Sprecher), Wilfried E. B. Winzer<br>
Vorsitzender des Aufsichtsrates: Prof. Dr. med. Peter C. Scriba<br>
</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE">USt.-IDNr.: DE 140 135 217, St.-Nr.: 203 145 03113</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>