[Eeglablist] Coherence or Correlation among set of electrodes

[Tim Mullen]

Iman,

The most reasonable answer to your question is to first perform source
reconstruction to isolate sources which project to multiple channels. Then
analyze the coherence between your sources.

If you are adamant about remaining in channel space, you might consider a
laplacian reference. Or you might perform separate PCA or ICA
decompositions of each group of channels and select the leading component
as a representative of each channel group, then estimate coherence between
component time-series. Another approach is to average the coherence for all
pairs of channels across the two groups. Just be aware that all of these
come with caveats and potential pitfalls (perhaps too numerous to detail at
length here).

- Tim

On Mon, Oct 15, 2012 at 5:17 PM, Iman M.Rezazadeh <irezazadeh at ucdavis.edu>wrote:

> Hi, ****
>
> Just wonder if there is a way to calculate the coherence measure between
> two regions( set of channels--instead of two single channels) in EEGLAB or
> any other software?  In other word, how can we find regions in the brain
> which their activities are mostley related to each other using EEG ?****
>
> ** **
>
> Best,****
>
> Iman ****
>
> ** **
>
> Iman M.Rezazadeh, PhD****
>
> Center for Mind and Brain****
>
> University of California, Davis****
>
> irezazadeh at ucdavis.edu****
>
> cell:310-490-1808****
>
> ** **
>
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