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Short answer People with above-normal hearing exist. Background Normal hearing was defined as the average of a group of young healthy individuals. These normal hearing levels are currently used to express acoustic sensitivities. One commonly used way is to use decibels relative to this normal hearing level (dB NH). This scale is used in audiograms (Schnupp ...


I'd like to add a reference about the scientific effects of binaural beats in the brain: Auditory Beats in the Brain; a transcript of the orginal paper by Gerald Oster, Scientific American, October 1973 (scanned original attached): Slow modulations called binaural beats are perceived when tones of different frequency are presented separately to each ear. ...

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