Hypersonic effect
Controversial claim that ultrasound produces measureable reactions in humans / From Wikipedia, the free encyclopedia
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The hypersonic effect is a phenomenon reported in a controversial scientific study by Tsutomu Oohashi et al.,[3] which claims that, although humans cannot consciously hear ultrasound (sounds at frequencies above approximately 20 kHz),[4][5][6][7] the presence or absence of those frequencies has a measurable effect on their physiological and psychological reactions.
Numerous other studies have contradicted the portion of the results relating to the subjective reaction to high-frequency audio, finding that people who have "good ears"[8] listening to Super Audio CDs and high resolution DVD-Audio recordings[9] on high fidelity systems capable of reproducing sounds up to 30 kHz[10] cannot tell the difference between high resolution audio and the normal CD sampling rate of 44.1 kHz.[8][11][12][13]