There's a wealth of research about the effects of binaural beats on the brain. The chart below offers up a whole new set of "Greeks". It would appear the 40Hz is ideal for trading/watching charts. The youtube link below is a pure 40Hz binaural, however there are many videos with other (relaxing) sounds tracked over the 40HZ that may be more appealing. Headphones are a requirement as the science by design is based on two ears. Try it out tomorrow. _____________________________________________ https://en.wikipedia.org/wiki/Binaural_beats Detailed Definition of Binaural Beats Binaural beats are auditory brain-stem responses which originate in the superior olivary nucleus of each brain hemisphere. They result from two different auditory impulses or sounds, heard from opposite ears. This binaural beat is consciously heard as the human hearing range is from 20-20,000 Hz. Rather it is perceived as an auditory beat and theoretically is being used coach certain brain rhythms from what is called the frequency-following response (the tendency for the brain to resonate at the frequency of an external stimulus). How It Works On The Brain When signals of two different frequencies (sounds) are presented, one to each ear, the brain detects phase differences between these signals. The brain processes this anomalous information differently when these phase differences are heard with stereo headphones or speakers. A perceptual integration of the two signals in perceived in the brain, producing the sensation of a third “beat”. The difference between the signals waxes and wanes (this is the “wavy” sound heard in the hypnotic sessions) as the two stereo sounds mesh in and out of phase. The binaural beat is perceived as a fluctuating rhythm at the frequency of the difference between the two auditory inputs. How Binaural Beats creates a Hypnotic Response Binaural beats can easily be heard at the low frequencies (< 30 Hz) that are characteristic of the EEG spectrum (Oster, 1973). This perceptual phenomenon of binaural beating and the objective measurement of the frequency-following response (Hink, Kodera, Yamada, Kaga, & Suzuki, 1980) suggest conditions which generate brain waves activity and altered states of consciousness (hypnotic trance). > 40 Hz Gamma waves Higher mental activity, including perception, problem solving, fear, and consciousness 13–39 Hz Beta waves Active, busy or anxious thinking and active concentration, arousal, cognition, and or paranoia 7–13 Hz Alpha waves Relaxation (while awake), pre-sleep and pre-wake drowsiness, REM sleep, Dreams 8–12 Hz Mu waves Sensorimotor rhythm Mu_rhythm, Sensorimotor_rhythm 4–7 Hz Theta waves deep meditation/relaxation, NREM sleep < 4 Hz Delta waves Deep dreamless sleep, loss of body awareness There are a growing amount of research efforts reporting changes in consciousness associated with binaural-beats. “The subjective effect of listening to binaural beats may be relaxing or stimulating, depending on the frequency of the binaural-beat stimulation” (Owens & Atwater, 1995). Binaural beats in the delta (1 to 4 Hz) and theta (4 to 8 Hz) ranges have been associated with reports of relaxed, meditative, and creative states (Hiew, 1995), and used as an aid to falling asleep. Binaural beats in the alpha frequencies (8 to 12 Hz) have increased alpha brain waves (Foster, 1990) and binaural beats in the beta frequencies (typically 16 to 24 Hz) have been associated with reports of increased concentration or alertness (Monroe, 1985) and improved memory (Kennerly, 1994).