Fukushima A, Yagi R, Kawai N, Honda M, Nishina E, Oohashi T (2014) Frequencies of Inaudible High-Frequency Sounds Differentially Affect Brain Activity: Positive and Negative Hypersonic Effects. PLoS ONE 9(4): e95464. doi:10.1371/journal.pone.0095464.
The conclusion to this study was:
Quote:
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By observing Alpha-2 EEG, it became clear that the emergence of the hypersonic effect changes either positively or negatively depending on the frequency of the HFC applied along with the audible sound. We showed that Alpha-2 EEG increases when HFCs above approximately 32 kHz are applied, which indicates that a positive hypersonic effect has emerged, as shown in our earlier studies. Our present study reports, for the first time, that Alpha-2 EEG decreases when HFCs below approximately 32 kHz are applied, which indicates the emergence of a negative hypersonic effect.
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Obviously one study this small is not a game changer but it is indeed an interesting study.