[Eeglablist] EEGLab - Single Epoch Spectral Analysis

Arnaud Delorme arno at salk.edu
Wed Apr 13 15:26:27 PDT 2005

Dear Rene,

> I want to analyse a singel epoch with the time frequency 
> transformation to get a spectral plot of the activity in this special 
> period. Why is it not possible to do so. There are always two epochs 
> needed to get a picture - what's the reason for this.

No, there is no technical reason for that. The timef funciton works on a 
single epoch ("pop_timef(EEG, 0);" to plot channels; "pop_timef(EEG, 
1);" to plot components). It does not work from the EEGLAB menu, because 
EEGLAB assumes that you are processing data epochs (we might remove this 
constraint in the future).

> Can I find another way to analyse only one epoch?

You may use the specgram function from the Matlab signal processing toolbox.



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