Re: Military Equipment Noise Costs $900 Million and Veterans' Hearing

On Nov 2, 5:29 am, hummahu...@humma.com wrote:
> >{EXCERPT} MarketWatch - While it is not yet available, the military is l
ooking
> >into technology that will one day replace the foam earplugs and active n
oise
> >reduction (ANR)...
>
> >http://www.marketwatch.com/news/story/Military-Equipment-Noise-Costs-...
>
> >Only problem is that once the maximum bone conduction attenuation is rea
ched, the most perfect ear protection will only offer about 45 dB of protec
tion.
>
> Won't help much if the noise is 140 dB.....

I think it is pretty clear that noise-induced hearing loss reveals as
profound high-frequency loss. While being evaluated for a CI I learnt
that the hair cells which detect high frequencies are those near the
entrance to the cochlea. And this, I suggest, is why they are the ones
most prone to damage from excessive noise - they are in the front
line. But this is not so of sound conducted other than through the ear
channel - such as through bone. Every part of the hearing system would
be equally exposed to bone-conducted noise.
But any situation capable of generating a level of bone-conducted
noise capable of damaging hearing would be likely to leave your body
in such shape that any hearing effects would be the least of your
worries.
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Poster (02.11.2008 02:21)