Understanding your brain waves and frequencies is the first step to understanding how anyone can manipulate or control your mind.
Electromagnetic spectrum:
https://en.wikipedia.org/wiki/Electromagnetic_spectrum
A gamma wave or gamma rhythm is a pattern of neural oscillation in humans with a frequency between 30 and 100 Hz, the 40 Hz point being of particular interest:
https://en.wikipedia.org/wiki/Gamma_wave
The frequency architecture of brain and brain body oscillations: an analysis
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6668003/
Just like fingerprints, we all have a brainprint