https://journals.physiology.org/doi/full/10.1152/jn.2000.83.6.3548?_nospa=true
"Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect"
Tsutomu Oohashi, Emi Nishina, Manabu Honda, Yoshiharu Yonekura, …
Journal of NeurophysiologyVol. 83, No. 6
"In conclusion, our findings that showed an increase in alpha-EEG potentials, activation of deep-seated brain structures, a correlation between alpha-EEG and rCBF in the thalamus, and a subjective preference toward FRS, give strong evidence supporting the existence of a previously unrecognized response to high-frequency sound beyond the audible range that might be distinct from more usual auditory phenomena. Additional support for this hypothesis could come from future noninvasive measurements of the biochemical markers in the brain such as monoamines or opioid peptides."
"Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect"
Tsutomu Oohashi, Emi Nishina, Manabu Honda, Yoshiharu Yonekura, …
Journal of NeurophysiologyVol. 83, No. 6
"In conclusion, our findings that showed an increase in alpha-EEG potentials, activation of deep-seated brain structures, a correlation between alpha-EEG and rCBF in the thalamus, and a subjective preference toward FRS, give strong evidence supporting the existence of a previously unrecognized response to high-frequency sound beyond the audible range that might be distinct from more usual auditory phenomena. Additional support for this hypothesis could come from future noninvasive measurements of the biochemical markers in the brain such as monoamines or opioid peptides."
Perceptual discrimination of very high frequency components in wide frequency range musical sound
Perceptual discrimination of very high frequency components in wide frequency range musical sound - ScienceDirect
"Abstract
Subjective evaluation tests on perceptual discrimination between musical sounds with and without very high frequency (above 20 kHz) components were conducted. To make a precise evaluation, the test system was designed to exclude any influence from very high frequency components in the audible frequency range. Moreover, a newly developed very wide frequency range microphone was used to record various sound stimuli that contained enough components in the very high frequency range. Tests showed that the subjects could discriminate between musical sounds with and without very high frequency components. This paper describes these subjective evaluations in terms of reproducing such very high frequency components in musical sound."
NHK Science and Technical Research Laboratories, Human and Information Science Division, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan
NHK Engineering Administration Department, 2-2-1 Jinnan, Shibuya-ku, Tokyo 150-8001, Japan
Received 14 October 2008, Accepted 6 January 2009, Available online 27 February 2009.
Perceptual discrimination of very high frequency components in wide frequency range musical sound - ScienceDirect
"Abstract
Subjective evaluation tests on perceptual discrimination between musical sounds with and without very high frequency (above 20 kHz) components were conducted. To make a precise evaluation, the test system was designed to exclude any influence from very high frequency components in the audible frequency range. Moreover, a newly developed very wide frequency range microphone was used to record various sound stimuli that contained enough components in the very high frequency range. Tests showed that the subjects could discriminate between musical sounds with and without very high frequency components. This paper describes these subjective evaluations in terms of reproducing such very high frequency components in musical sound."
NHK Science and Technical Research Laboratories, Human and Information Science Division, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan
NHK Engineering Administration Department, 2-2-1 Jinnan, Shibuya-ku, Tokyo 150-8001, Japan
Received 14 October 2008, Accepted 6 January 2009, Available online 27 February 2009.
It was known as early as 1991. And AES (Audio Engineering Society) was fully aware of it:
AES E-Library >> High-Frequency Sound Above the Audible Range Affects Brain Electric Activity and Sound Perception
"High-Frequency Sound Above the Audible Range Affects Brain Electric Activity and Sound Perception"
"The authors have developed a new system for sound presentation and a novel technique to measure brain electric activity, and used them to determine if high frequency components above the audible range can influence sound perception in ways not discerned by the method of paired comparisons. The authors report that high frequency sound induces activation of electroencephalogram rhythms that persist in the absence of high frequency stimulation, and can affect perception of sound quality."
Authors: Oohashi, Tsutomu; Nishina, Emi; Kawai, Norie; Fuwamoto, Yoshitaka; Imai, Hiroshi
Affiliation: National Institute of Multimedia Education, Chiba-Shi 260, Japan
AES Convention: 91 (October 1991) Paper Number: 3207
Publication Date: October 1, 1991 Import into BibTeX
Subject: Psychoacoustics
Permalink: AES E-Library » High-Frequency Sound Above the Audible Range Affects Brain Electric Activity and Sound Perception
AES E-Library >> High-Frequency Sound Above the Audible Range Affects Brain Electric Activity and Sound Perception
"High-Frequency Sound Above the Audible Range Affects Brain Electric Activity and Sound Perception"
"The authors have developed a new system for sound presentation and a novel technique to measure brain electric activity, and used them to determine if high frequency components above the audible range can influence sound perception in ways not discerned by the method of paired comparisons. The authors report that high frequency sound induces activation of electroencephalogram rhythms that persist in the absence of high frequency stimulation, and can affect perception of sound quality."
Authors: Oohashi, Tsutomu; Nishina, Emi; Kawai, Norie; Fuwamoto, Yoshitaka; Imai, Hiroshi
Affiliation: National Institute of Multimedia Education, Chiba-Shi 260, Japan
AES Convention: 91 (October 1991) Paper Number: 3207
Publication Date: October 1, 1991 Import into BibTeX
Subject: Psychoacoustics
Permalink: AES E-Library » High-Frequency Sound Above the Audible Range Affects Brain Electric Activity and Sound Perception
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Conclusion: you are not human so you must be a duck. If you are a duck you are a witch!!
Spectra of Pink Floyd 1973 "The Dark Side on the Moon" album, my sampling from vinyl, very good phono stage similar to
2N2222A phono preamp
Well above 60kHz, up to 80 kHz:
(at 38kHz - noise from mobo quartz)
2N2222A phono preamp
Well above 60kHz, up to 80 kHz:
(at 38kHz - noise from mobo quartz)
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