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Re: Impacts from ultrasound and infrasound
Please let me mention the common misunderstanding that the human hearing
"stops" st around 16-20 Hz. We do denote sound below 20 Hz as
"infrasound", but it is not inaudible. Below these frequencies, the
perception changes, and the tonal sensation disappears. But tones at
least down to a couple of hertz can indeed be perceived by everyone. The
lower the frequency, the higher the threshold. The sensation goes
through the ear, not the body as often claimed. I think it is still
unclear, if the sensation is from the cochlear or elsewhere in the ear.
For a fairly recent review, please allow me to promote our article:
Henrik Møller, Christian Sejer Pedersen: "Hearing at low and infrasonic
frequencies", Noise & Health, Vol. 6(23), pp. 37-57 (2004).
The idea of infrasound being inaudible has caused a number of
misunderstandings, in particular in the popular press (but also in the
Section of Acoustics, Department of Electronic Systems
Fredrik Bajers Vej 7 B5
DK-9220 Aalborg Ø, Denmark
Phone: +45 9940 8711 (direct)
Phone: +45 9940 8710 (section office)
Phone: +45 9940 9940 (switchboard)
Fax: +45 9815 2144 (section office)
mailto:acoustics@xxxxxxxxxxxxxxxx (section office)
Amy R. Scholik-Schlomer skrev:
I am emailing to ask the group if anyone can direct me to publications
(preferably reviews) on the impacts of ultrasound or infrasound on
humans/animals. Typically, impacts are only considered for those
noises that fall into a species auditory range, but I wanted to know
more about potential impacts/likelihood for impacts for those sounds
outside the auditory range (assuming they would be more physiological,
rather than behavioral, where an animal would have to hear the sound
in order to respond).
I am coming at this from a bit different angle, since I am considering
this in the context of non-human hearing ranges (thus, infra- and
ultrasonic ranges may be different depending on the species),
specifically for marine species (fish, marine mammals, and sea turtles).
In order not to clog up everyone's email boxes, you can respond to me
directly, if you like (email in my signature below).
Thanks for your help,
Amy R. Scholik-Schlomer, Ph.D.
NOAA's National Marine Fisheries Service
Office of Protected Resources
Marine Mammal & Sea Turtle Conservation Division
1315 East-West Highway
SSMC III, Room 13605
Silver Spring, MD 20910
Phone: (301) 713-2322 x167
Fax: (301) 713-4060