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Heidegger, M. (1962). Being and time. J. Macquarrie & E. Robinson, Trans. Oxford: Blackwell.   
Last edited by: Mark Grimshaw-Aagaard 11/12/2023, 12:24
Heidegger spends a few lines discussing the primacy of vision or 'seeing.' He follows Augustine and Aristotle in equating the verb 'to see' with 'to understand' and cognition – 'I see what you mean,' for example. He quotes Aristotle: "The care for seeing is essential to man's Being" (215) – "cognition was conceived [by the ancient Greeks] in terms of 'the desire to see'."
Howard, C. Q., Hansen, C. H., & Zander, A. C. (2004). A review of current airborne ultrasound exposure limits. Journal of Occupational Health and Safety - Australia and New Zealand, 21(3), 253–257.   
Added by: Mark Grimshaw-Aagaard 29/11/2022, 07:51
Claims that the output at 1m of some parabolic speakers is +130dB and even as high as 140dB.
Leighton, T. G., Lineton, B., Dolder, C., & Fletcher, M. D. (2020). Public exposure to airborne ultrasound and very high frequency sound. Acoustics Today, 16(3), 17–26.   
Last edited by: Mark Grimshaw-Aagaard 06/12/2022, 10:58

Provides a map of London showing peaks in the range 17.4–22.4kHz measured c.2017 by public smartphones (Fletcher et al. 2018).



Fletcher, M. D., Jones, S. L., White, P. R., Dolder, C. N., Lineton, B., & Leighton, T. G. (2018). Public exposure to ultrasound and very high-frequency sound in air. The Journal of the Acoustical Society of America, 144(4), 2554–2564.
Smith, S. D., Nixon, C. W., & Von Gierke, H. E. (2006). Damage risk criteria for hearing and human body vibration. In I. L. Vér & L. L. Beranek (Eds), Noise and Vibration Control Engineering: Principles and Applications 2nd ed. (pp. 857–886). Wiley Online Library. (Original work published 2005).   
Added by: Mark Grimshaw-Aagaard 06/12/2022, 10:54
Different recommendations and regulations around the globe for exposure to ultrasound: WHO 110dB, USA and Seden, 115dB, and Norway 120dB for frequencies higher than 22kHz (3rd 8ve band).
WIKINDX 6.8.2 | Total resources: 1301 | Username: -- | Bibliography: WIKINDX Master Bibliography | Style: American Psychological Association (APA)