[Eeglablist] Three EEGLAB questions

[Giovanni Santostasi]

This is a nice paper that combines the idea of using the Hilbert transform
and Granger causality to measure temporal and phase coherence:
http://www.hindawi.com/isrn/signal.processing/2013/374064/

Giovanni



On Mon, Sep 30, 2013 at 1:40 PM, Giovanni Santostasi
<gsantostasi at gmail.com>wrote:

> 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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