ELF frequencies have very little effect on the brain. Microwaves, on the other hand...
A while ago, I
fully got into this. There were experiments done on what is called the 'Frey Effect':
https://www.youtube.com/watch?v=FNpBd_f_p9g
Then, during the 1970's a tone called the 'Woodpecker Tone' produced by a Russian aerial array (DUGA-3), blacked out half of the United States!
Not to mention the stuff that goes on at HAARP now.
Scary eh?