Consider these infos: brain waves are between 0.1 and 15 Hz. They use our body and some chemicals that are around as non linear frequency mixers in order to create difference and sum of frequencies. Plus they  use freq modulation. You should if you know, create a non linear unshielded mixer to detect ELF range output. Do the same ELF range detector for led lights. You'll see what comes out. Restore old incandescent lights. Check ELF embedded in videos shared on internet (there is a patent on this).
Very few know and understand how it works. Hardware knowledge is almost zero now.