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Heidegger, M. (1977). The question concerning technology and other essays. W. Lovitt, Trans. New York & London: Garland Publishing.   
Last edited by: Mark Grimshaw-Aagaard 10/05/2023, 09:57
"But we do not yet hear, we whose hearing and seeing are perishing through radio and film under the rule of technology."
Heidegger, M. (1962). Being and time. J. Macquarrie & E. Robinson, Trans. Oxford: Blackwell.   
Last edited by: Mark Grimshaw-Aagaard 11/12/2023, 12:24
"We can make clear the connection of discourse with understanding and intelligibility by considering an existential possibility which belongs to talking itself—hearing. If we have not heard 'aright', it is not by accident that we say we have not 'understood'. Hearing is constitutive for discourse."
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'."
"It requires a very artificial and complicated frame-of-mind to 'hear' a 'pure noise'. The fact that motor-cycles and waggons are what we proximally hear is the phenomenal evidence that in every case Dasein, as Being-in-the-world, already dwells alongside what is ready-to-hand within-the-world; it certainly does not dwell proximally alongside 'sensations'; nor would it first have to give shape to the swirl of sensations to provide the springboard from which the subject leaps off and finally arrives at a 'world'. Dasein, as essentially understanding, is proximally alongside what is understood."
"It is on the basis of this potentiality for hearing, which is existentially primary, that anything like hearkening becomes possible. Hearkening is phenomenally still more primordial than what is defined 'in the first instance' as "hearing" in psychology—the sensing of tones and the perception of sounds. Hearkening too has the kind of Being of the hearing which understands. What we 'first' hear is never noises or complexes of sounds but the creaking waggon, the motor-cycle. We hear the column on the march, the north wind, the woodpecker tapping, the fire crackling."
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
Concensus on ultrasound exposure in SPL below 4 hours.
Frequency
(kHz)
Sound Pressure Level
(dB re 20mPa)
20 75
25 110
31.5 110
40 110
50 110

 

Later (p. 258) cites recommendations (American Conference of Governmental Industrial Hygienists) suggesting that exposure levels may be 30dB higher than the above.

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
"ultrasonic energy at frequencies above about 17kHz and at levels in excess of about 70dB may produce adverse subjective effects experienced as fullness in the ear, fatigue, headache, and malaise."
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).
Windmill, J. F. C., & Jackson, J. C. (2016). Mechanical specializations of insect ears. In G. S. Pollack, A. C. Mason, A. N. Popper & R. R. Fay (Eds), Insect Hearing (pp. 125–157). Switzerland: Springer Nature.   
Last edited by: Mark Grimshaw-Aagaard 10/02/2023, 16:25
"The sound frequencies exploited by different species of katydids [crickets] vary across a huge range from 2 to 150 kHz."
WIKINDX 6.8.2 | Total resources: 1301 | Username: -- | Bibliography: WIKINDX Master Bibliography | Style: American Psychological Association (APA)