https://soundcloud.com/mindpersuasion/gamma-40hz-binaural-beats-for-intense-focus-concentration-and-cognitive-improvement
scientifically based sound that helps people focus better and concentrate...the German study on "binaural beats" was printed in the journal, "Frontiers in Psychology."
below is a link:https://www.frontiersin.org/articles/10.3389/fpsyg.2016.01287/full
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