Delta waves (0.5-4 Hz) signify a state of deep sleep. A binaural beat with a frequency between 4 and 7 Hz, for example, is more likely to align with theta brain waves, promoting sleep and relaxation.
The beloved A-10 Thunderbolt II attack aircraft is picking up a brand new "three-dimensional" surround-sound audio system too boost Warthog pilots' situational awareness By Jared Keller Posted on ...