[FieldTrip] FFT and filtering

[Marco Rotonda]

Hi Fieldtrippers,
I had a quite simple question, even though I was not so sure how to respond.
Let suppose I have an EEG raw signal and I'm interested on the mean
amplitude of some bands (delta, theta, etc.).
The signal is continuous so I take chunks of data (let say one second).
Let suppose the signal is clean (no artifacts).
Should I have to filter the signal before doing the FFT or I can just do
the FFT of the signal and take the mean of the bands I'm interested on?

Take care

Marco
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