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an increase in the threshold of hearing that is permanent, not temporary. It
is an unrecoverable deafening due to physiological damage to the hearing organs
that does not diminish with time. PTS may occur as a result of long-term
exposures and/or extremely loud noises. Repeated exposures that cause to
temporary threshold shift (TTS) can induce PTS, as well. The mitigation measures
proposed for implementation under the proposed research and discussed in the EA
are designed to ensure that PTS does not occur from experiments under the
proposed research.
Source:
Outline for Acoustics Environmental Assessment
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