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Related Experiment Videos

Squirrel monkey temporary threshold shift from 48-h exposures to low-frequency noise.

D W Nielsen, J Burnham, C Talley

    The Journal of the Acoustical Society of America
    |August 1, 1978
    PubMed
    Summary

    Squirrel monkeys exposed to noise showed temporary threshold shift (TTS) patterns similar to humans. Their hearing recovery was biphasic, suggesting potential for comparative studies on noise-induced hearing loss.

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    Area of Science:

    • Auditory Science
    • Comparative Physiology
    • Noise-Induced Hearing Loss Research

    Background:

    • Occupational and recreational noise exposure can lead to hearing damage.
    • Understanding temporary threshold shift (TTS) is crucial for assessing noise impact.
    • Squirrel monkeys serve as a model organism in auditory research.

    Purpose of the Study:

    • To investigate the growth and recovery patterns of temporary threshold shift (TTS) in squirrel monkeys.
    • To compare TTS development and recovery in squirrel monkeys with human responses.
    • To evaluate the suitability of squirrel monkeys for future research on noise-induced hearing loss.

    Main Methods:

    • Five squirrel monkeys were exposed to band noise (375--750 Hz) at 95 dB SPL for varying durations (1–48 h).

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  • Hearing thresholds were measured at 750 Hz before, during, and after noise exposure.
  • Sound Pressure Level (SPL) was increased to 105 dB for a 1-h exposure to assess its impact.

    • Main Results:

    • The TTS growth pattern was biphasic and did not asymptote after 48 h of noise exposure.
    • Auditory thresholds returned to within 5 dB of pre-exposure levels 20 h after all exposures.
    • Increasing SPL from 95 to 105 dB for 1 h increased TTS by 4 dB, with similar recovery patterns.

    Conclusions:

    • The growth and recovery of TTS in squirrel monkeys exhibit biphasic patterns.
    • Squirrel monkey TTS responses are comparable to human responses under similar noise exposure conditions.
    • These similarities support the use of squirrel monkeys for further comparative research on hearing loss.