your brain waves on meditation

How Sound and Light Hack the Brain

 " The brain produces varying proportions of brain wave types, depending on its current levels of relaxation, focus, and other mental states.  Each type of wave has its own characteristic frequency range, which can be read by electroencephalography.  Many people's brain waves will synchronize to lights and sounds pulsing at brain wave frequencies, and this makes the brain change its state --- a process called "entrainment."  By playing sequences of pulses into your eyes and ears, you can program your brain to follow any brain wave experience your like."

                                                                                             - MAKE