![]() Another reason why the sounds did not affect blood pressure and pulse may be due to the participant's age since older brains may not perceive the binaural beats as well as younger brains. One reason for this may be that the sounds were not played long enough for the brain to either perceive and/or resonate to the frequency. ![]() The results showed that the control and the two binaural beats did not affect the 12 participant's blood pressure or pulse (p > 0.05). Figures 3 and 4 show individual and averaged fusion range results at various coherent AM conditions (2, 4, and 8 Hz) as a function of modulation depth (0, 20, 40, 60, 80, and 100) for NH and HA subjects, respectively. Each participant was given 2 minutes in-between each sound. Effects of Coherent AM on Binaural Pitch Fusion. Blood pressure and pulse were recorded before and after each sound was played. ![]() Using headphones, three sounds were played for 7 minutes each to 12 participants: the control,- the sound of a babbling brook (the background sound to the two binaural beats), the beta binaural beat (20 Hz), and the theta binaural beat (7 Hz). In this experiment, the effects of the beta and theta binaural beat on human blood pressure and pulse were studied. Once the brain is in tune with the binaural beat it produces brainwaves of that frequency altering the listener's state of mind. A binaural beat is the tone (or frequency) perceived by the brain when two different tones very close in pitch are sent to the listeners ears simultaneously. The brain perceives the binaural beat and resonates to its frequency (frequency following response). Binaural beats are played through headphones and are perceived by the superior olivary nucleus of each hemisphere of the brain. Binaural beats are the differences in two different frequencies (in the range of 30-1000 Hz).
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