[Eeglablist] question

[Arnaud Delorme]

Dear T. Almabruk,

the original paper describes the computation of coherence

http://sccn.ucsd.edu/~arno/mypapers/DelormeEEGLAB2004.pdf

The Matlab mscohere function extracts windows in your data and uses the average to compute coherence, so it needs to be applied to continuous data. By contrast the EEGLAB function you are using assumes the windows have been extracted (it assumes data epochs). Otherwise the result should be the same as I think mscohere computes phase coherence and is also bounded between 0 and 1. If someone on the list would not mind to check, that would be a worthwhile exercise.

Best,

Arno

On 13 Feb 2013, at 00:43, T. Almabruk wrote:

> Hello
> I have a question about using eeglab to compute coherence between two signals.
> I followed these steps: plot-> time-frequency transform -> component cross-coherence.
> the figure i got it is not understandable for me. i mean i expect that i'll have a figure represents the coherence. but i got two curves and i don't know which one represents the coherence and when i computed the coherence by
> mscohere and plot the result i can see no similarity between this result and eeglab result.
> i think i misunderstand something.Can i get some help please.
> Cheers,
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