[Eeglablist] how can i compute power spectral denisty for EEG bands?

[Arnaud Delorme]

Dear Nagwa,

> i want to know what are the most used functions in computing the power 
> spectral denisty for EEG bands, also need to know how to use it , and 
> what are the useful EEG bands that we should compute the power 
> spectral density for them?
>

On continuous data, you may use the EEGLAB spectopo function (menu "Plot 
 > Channel spectra and maps") or you may use the pwelch function from 
the command line. Spectral EEG bands of interest in humans include delta 
0.5-2 Hz, Theta 4-7 Hz, alpha 9-11 Hz, beta 18-21 Hz, gamma 30-60 Hz, 
and these days high gamma up to 180 Hz. These numbers are not fixed in 
stone and there exist some refinement low alpha/high alpha, low 
beta/high beta etc... It might be better to compute power spectral 
density at all frequencies (less than 1 Hz resolution) and then decide 
what is interesting.

Best,

Arno