MattC & Farough, thanks so much for the replies. That clarifies a lot!

The frequency bands are divided something like this:

Beta: 16 - 30 Hz

Alpha: 8 -15 Hz

Theta: 4 - 7 Hz

Delta: 1 - 4 Hz

So I need to be using the /muse/dsp/bandpower/raw_fft path which says this:

[I]130 decimal values with a range of roughly -4.0 to 2.0. This represents FFT for the first channel, show the absolute power on a log scale(dB) [/I][I]of each frequency from 0hz-110Hz, divided into 130 bins.[/I]

This means that I need to take for example the Theta band:

/muse/dsp/bandpower/raw_fft0 4 - 7

/muse/dsp/bandpower/raw_fft1 4 - 7

/muse/dsp/bandpower/raw_fft2 4 - 7

/muse/dsp/bandpower/raw_fft3 4 - 7

take the average of these numbers and then I would get a number somewhere between -4.0 - 2.0 right?

Then measure this for all the four bands and see which one of the four bands has the highest number between -4.0 and 2.0? To know which one of the bands is dominant at a given moment.

I hope that I understood it correctly, and hope that you can confirm or explain further!

Thanks so much for your help!