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- In acoustics, for a specified signal, the minimum sound pressure
level at the entrance to the external auditory canal which, in a
specified fraction of the trials, will stimulate the ear to a point at
which there is a sensation of feeling that is different from the
sensation of hearing. Also called tickle.
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The sound pressure level that makes the ears tickle, located about 120 dB above
the threshold of hearing.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
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