How to Build a Universe: Philip K. Dick on Reality, Media Manipulation, and Human Heroism. It's Okay To Be Smart. Binaural beats. Binaural beats To experience the binaural beats perception, it is best to listen to this file with headphones on moderate to weak volume – the sound should be easily heard, but not loud.
Note that the sound appears to pulsate. Now remove one earphone. Note that the pulsations disappear completely. Repeat with your other ear. National Geographic: Test Your Brain Episode 2 - Perception.