Three images, left to right, of the same thundercloud depict a less - than -10-milliseconds-long sequence of events: (left) formation within the cloud of a small channel, or «leader,» of
electrical conductivity (yellow line) with
weak emission of radio signals (ripples), to (middle) a burst of both dark lightning (pink) and radio
waves (larger ripples), to (right) a discharge of bright lightning and more radio
waves.
The researchers discovered that application of a
weak electrical current via the scalp helps align different areas of the brain, synchronizing brain
waves and allowing the areas to maintain the same beat.