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Case Study 52: Behavioral and Audiologic Manifestations of Noise-Induced Hearing Loss
Pages 868-871

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From page 868...
... Such middle-ear disorders are more likely to appear, if at all, once the peak noise exposure level exceeds approximately 160 dB SPI,. In general, however, any acute sound exposure that causes any of the following symptoms represents a hazard to the auditory system and could result in an acute acoustic trauma: immediate pain, a tickling sensation in the ears often occurring if the SPL~ exceeds approximately 120 dB, vertigo, tinnitus, hearing loss, or reduced communication skills.
From page 869...
... 16-5. Hearing loss induced by most industrial noise characteristically produces a bilateral symmetrical loss that is progressive in nature so long as the individual is continuously exposed to hazardous noise levels (Fig.
From page 870...
... Given that approximately 95 percent of the frequency components in speech lie between 300 and 3,000 Hz, it should not be surprising to find a deterioration in speech intelligibility performance once the NTHL extends into this range of frequencies. Also, individuals with sensorineural hearing loss, due either to noise exposure or other factors, usually have greater difficulty understanding speech against a competing background noise environment than in a quiet environment.
From page 871...
... Audiological management of the individual with NEIL may include the use of hearing aids, aural rehabilitation, and assistive listening devices to help improve some of the communication dysfunction experienced in certain listening situation. What, if any, strategies are implemented depends largely on the severity of the communication handicap produced by the noise exposure and the listening needs of the individual.


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