I have a few posts about using 40 HZ light and sound for brainwave entrainment to get our brains to Gamma frequencies and maybe help heal the brains (I still need to dig into the evidence on this working). Here are the posts: healthunlocked.com/cure-par... healthunlocked.com/cure-par...
THIS POST IS TO LET PEOPLE KNOW THAT THE "actual 40 HZ clicking monaural audio MIT used in their trials" VIDEO I LINKED TO ACTUALLY SAYS IT IS FROM THE MOUSE STUDY.
And in this video, Dr Tsai from MIT says the 40 HZ Monaural Beat they used was specifically designed for the mouse hearing range: youtu.be/h9m5lkbpOt0?t=2979
So maybe, if you want to listen to a 40 HZ Monaural Beat you may want to use the one I made: Monaural Beats 40 HZ Sawtooth.mp3 (I created this MP3. It has not been validated in studies) - drive.google.com/file/d/1Rd...
I also have an audio book with this 40 HZ tone mixed in: Elementary Theosophy - drive.google.com/drive/fold...
I will keep digging.