How to isolate the rhythms of the human brain according to the electroencephalogram data?

Question

Python

Hello.
There are electroencephalogram data and a program that can be used to visualize this data.
But how can one deduce separately the theta rhythm or any other rhythm of the brain? If you do a Fourier transform, reset unnecessary frequencies, do an inverse Fourier transform, something is wrong.
How can this be done? If there are ready-made solutions, then please write about them.

Answer 1

You here https://tinyurl.com/yxb7sd4a