...and speaking of dogs.
A high-pitched "dog whistle" device is to be used by police in north
Staffordshire to stop groups of nuisance youths hanging around shops.
The
Mosquito sends out a pulsing 80-decibel frequency noise which can usually only
be heard by teenagers and those in their early 20s.[...]
Det Insp Davies stressed the device, which is protected from vandals by a
metal cage, did not cause pain and had been vetted for any health and safety
implications.
"The noise can normally only be heard by those between 12 and
22 and it makes the listener feel uncomfortable.
Looks like my reign of terror is drawing to a close.
Okay seriously, am I the only one who thinks this is more than a little creepy?
posted by Turnea at
11:27 AM
4 Comments:
Why do people of these ages only hear this whistle? odd.
By
bucket, at 11:54 AM
I believe it has to do with the continuing development of the inner ear. At some point in development the eardrum simply cannot resonate at certain high frequencies.
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