Psychological evaluation indicated that the subjects felt the sound containing high-frequency components to be more pleasant than the same sound lacking high-frequency components. These results suggest the existence of a previously unrecognized response to complex sound containing particular types of high frequencies above the audible range. We term this phenomenon the “hypersonic effect.”

This is incredibly interesting because it proves that humans “hear” beyond the established range of frequencies. I actually didn’t know that the frequency range of 20hz-20khz was an arbitrary scale imposed by previous researchers. This article uses Balinese Gamelan music which is awesome and full of HFC. The full article from the Journal of Neurophysiology is here

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