[Eeglablist] channel coherence

[Arnaud Delorme]

It is important to remember than coherence as defined in EEGLAB

Delorme, A., Makeig, S. (2004) EEGLAB: an open source toolbox for 
analysis of single-trial EEG dynamics including independent component 
analysis. Journal of Neuroscience Methods, 134(1), 9-21.

can only be computed when data epochs are present. For continuous data, 
the function crossf (or newcrossf) will only compute the phase 
difference between the two signal (the amplitude of the coherence will 
be 1 but the phase might still vary). No significance may be assessed in 
this case (although it would be possible in theory to assess the 
stability of the phase difference - which is supposed to be random).

Best,

Arno

Kevin Whittingstall wrote:
>   Hello there,
>
>                   I am trying to calculate the coherence between two 
> channels of continuous data (that is, there are no 'epochs'.  Any 
> suggestions on how to carry this out?
>
> Thanks,
> Kevin
>
>
>