[Eeglablist] Three EEGLAB questions

[John Kounios]

Rob,

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.

Regards,
John

*
*
*John Kounios**, Ph.D.*
*Professor
Department of Psychology
**
**Drexel University
*
Stratton Hall
3141 Chestnut Street
Drexel University
Philadelphia, PA 19104

Tel: 215.533.7105  |  Fax: 215.895.4930
drexel.edu

http://www.drexel.edu/psychology/contact/facultyDirectory/JohnKounios/

Twitter:  http://Twitter.com/JohnKounios









On Fri, Sep 27, 2013 at 9:21 PM, robert coben <drcoben at gmail.com> wrote:

> Fred and Arnaud,
>
> 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.
>
> Rob
>
>
> On Sep 27, 2013, at 5:38 PM, Fred Travis <ftravis at mum.edu> wrote:
>
>  Hi Arnaud
>
> 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
>
> Fred
>  On 9/27/2013 2:54 PM, Arnaud Delorme wrote:
>
> Hi Fred,
>
>  what do you mean by synchrony?
> 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.
>
>  Hope this helps,
>
>  Arno
>
>
>    1. synchrony (rather than coherence)
>
>  2. cross frequency coherence--coherence between frequency bands (Palva
> and Palva)
> 3. cepstrum analysis--frequency analysis of the power spectra
>
> Many thanks
>
> Fred
>
> --
> Fred Travis, Ph.D.
> Director, Center for Brain, Consciousness and Cognition
> Dean, Graduate School
> Chair, Maharishi Vedic Science Department
> Office:  641 472 1209
> Fax: 641 470 1316
> Skype: fredtravis
> Website: drfredtravis.com
>
>  _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>
>
>
> --
> Fred Travis, Ph.D.
> Director, Center for Brain, Consciousness and Cognition
> Dean, Graduate School
> Chair, Maharishi Vedic Science Department
> Office:  641 472 1209
> Fax: 641 470 1316
> Skype: fredtravis
> Website: drfredtravis.com
>
>  _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>
>
>
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20130930/dc7a5800/attachment.html>