Theres definitely scientific evidence out there, but honestly the best thing to do is just try it out for yourself. I have no doubt that brainwave entrainment is very real, but either way, the placebo effect is an extremely powerful thing.
RE: 417Hz Intelligence Enhancement Monaural Beats + Isochronic Tones
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417Hz Intelligence Enhancement Monaural Beats + Isochronic Tones
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