<div dir="ltr">Rob,<div><br></div><div>Don't be so hard on coherence. Ordinarily, it is contaminated by EMG artifact and volume conduction. However, if you re-reference to Laplacian first, then EMG artifact is virtually eliminated from non-peripheral electrodes (see recent IEEE paper by Fitzgibbon et al.) and volume conduction is also virtually eliminated (see various papers by Nunez, Srinivasan, and colleagues). But you need to use a dense electrode array to do this effectively.</div>
<div><br></div><div>Regards,</div><div>John</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><font color="#003377" face="Arial,sans-serif"><b><font><br></font></b></font></div><div><font color="#003377" face="Arial,sans-serif"><b><font>J</font>ohn Kounios</b><span style="font-size:10pt"><b>, Ph.D.</b></span></font><br style="font-family:Tahoma,'Sans Serif',Arial;font-size:11.199999809265137px">
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<br><br><div class="gmail_quote">On Fri, Sep 27, 2013 at 9:21 PM, robert coben <span dir="ltr"><<a href="mailto:drcoben@gmail.com" target="_blank">drcoben@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Fred and Arnaud,<div><br></div><div>Having worked with coherence and more recently sloreta coherence and SIFT, I will provide some feedback. Coherence as a measure of "connectivity" between pairs is extremely flawed. I would agree with Arnaud is recommending SIFT and granger causality. The information is much richer and more closely resembles structural connectivity metrics.</div>
<div><br></div><div>Rob</div><div><br></div><div><br><div><div>On Sep 27, 2013, at 5:38 PM, Fred Travis <<a href="mailto:ftravis@mum.edu" target="_blank">ftravis@mum.edu</a>> wrote:</div><br><blockquote type="cite">
<div text="#6600CC" bgcolor="#FFFFFF">
<font face="Verdana">Hi Arnaud<br>
<br>
By synchrony I mean in phase EEG. Coherence us a general
case-stability of phase relation--and synchrony is a specific
case--stability of phase relation and in phase<br>
<br>
Fred<br>
</font>
<div>On 9/27/2013 2:54 PM, Arnaud Delorme
wrote:<br>
</div>
<blockquote type="cite">
Hi Fred,
<div><br>
</div>
<div>what do you mean by synchrony? </div>
<div>To caclulate some of additional connectivity measures, you
might want to try SIFT, an EEGLAB associated toolbox and plugin.
It will allow you to compute Granger Causality based measures
such as partial directed coherence. It will also allow you to
compute many other measures including the popular directed
transfer entropy.</div>
<div><br>
</div>
<div>Hope this helps,</div>
<div><br>
</div>
<div>Arno</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div>
<div>
<blockquote type="cite">
<div>1. synchrony (rather than coherence)</div>
</blockquote>
<blockquote type="cite">
<div> 2. cross frequency coherence--coherence between
frequency bands (Palva and Palva)<br>
3. cepstrum analysis--frequency analysis of the power
spectra<br>
<br>
Many thanks<br>
<br>
Fred<br>
<pre cols="72">--
Fred Travis, Ph.D.
Director, Center for Brain, Consciousness and Cognition
Dean, Graduate School
Chair, Maharishi Vedic Science Department
Office: <a href="tel:641%20472%201209" value="+16414721209" target="_blank">641 472 1209</a>
Fax: <a href="tel:641%20470%201316" value="+16414701316" target="_blank">641 470 1316</a>
Skype: fredtravis
Website: <a href="http://drfredtravis.com/" target="_blank">drfredtravis.com</a></pre>
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<pre cols="72">--
Fred Travis, Ph.D.
Director, Center for Brain, Consciousness and Cognition
Dean, Graduate School
Chair, Maharishi Vedic Science Department
Office: <a href="tel:641%20472%201209" value="+16414721209" target="_blank">641 472 1209</a>
Fax: <a href="tel:641%20470%201316" value="+16414701316" target="_blank">641 470 1316</a>
Skype: fredtravis
Website: <a href="http://drfredtravis.com" target="_blank">drfredtravis.com</a></pre>
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