[Eeglablist] Brain Wave Frequency Ranges: Which definition is good or correct?

[vic roc]

Hi dear colleagues

I see lots of quite different frequency ranges defined in different studies
and references for the delta, theta, alpha, beta, and gamma brain waves.
These are very very different, and in many cases inconsistent and
controversial.

Why is that so?

And which range is the correct one? At least, which range is the better
one? And why?

Thanks in advance.
Best,
Vic