EEG to different waves

[ted...@googlemail.com]

Hi everyone!

I started to have a deeper understanding how actually brainwave
rhythms are generated. Now I guess I am clear about the electrical
activity of the neurons and how these tiny little cells add their
discharges together to give us some EEG on the graphs.
What I am still not clear about is, how different waves (delta,
theta, alfa, beta) are separated of the raw data. I assume it is
something to do with the FFT.

If anyone could give me an idea where to find a good explanation of
how this works, would be appreciated.

All the best,

Krisztian