[Eeglablist] Three EEGLAB questions

[Giovanni Santostasi]

Hi Fred,
Not sure about EEGlab per se, but I had to look at syncrony as you define
it in my own work and it is relatively easy by writing a simple script in
MatLab.

For example you can apply a filter in the alpha band (use filtfilt to avoid
to introduce phase shifts) if you are interested in coherence in that band
to your two time series and then use the Hilbert transform to calculate the
phase for each time series. The difference between the two times series
would give you a measure of phase coherence (you could even calculate this
in terms of percent difference).

Giovanni Santostasi



On Fri, Sep 27, 2013 at 4:38 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
>
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>
> --
> 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
>
>
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