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Physiological and psychophysical measures from humans with temporary threshold shift

A J Klein, J H Mills

    The Journal of the Acoustical Society of America
    |October 1, 1981
    PubMed
    Summary
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    Noise exposure from loud sounds can alter auditory function, affecting brainstem responses and hearing sensitivity. Tuning curves widened after noise exposure, with recovery varying significantly among individuals.

    Area of Science:

    • Auditory Neuroscience
    • Audiology
    • Neuroscience

    Background:

    • Noise-induced temporary threshold shift (TTS) impacts auditory function.
    • Auditory-evoked brainstem response (ABR) and psychophysical tuning curves (PTCs) are key measures of auditory processing.
    • Understanding the effects of noise on these measures is crucial for hearing health.

    Purpose of the Study:

    • To investigate changes in ABR (wave I and V) and PTCs following noise-induced TTS in humans.
    • To compare the effects of noise exposure on different auditory measures.
    • To examine the recovery patterns of these auditory functions.

    Main Methods:

    • Five human subjects experienced temporary threshold shift (TTS) induced by prolonged noise exposure.
    • Auditory-evoked brainstem response (ABR) tuning curves and amplitude-intensity functions for waves I and V were recorded.

    Related Experiment Videos

  • Psychophysical tuning curves (PTCs) were measured using pure-tone maskers and a 3.6-kHz tone pip signal.
  • Measurements were taken before and after noise exposure.

    • Main Results:

    • Noise exposure led to wider tuning curves (both ABR and psychophysical) in all subjects.
    • Wave I amplitude changes were more pronounced than wave V amplitude changes in some subjects.
    • Individual differences in ABR and PTC measurements were substantial despite small TTS variability.
    • Recovery of tuning curves varied significantly (7-41 hours) and preceded full TTS recovery.

    Conclusions:

    • Noise exposure significantly alters auditory tuning, broadening response areas across different measures.
    • Wave I of the ABR appears more susceptible to noise-induced changes than wave V.
    • Auditory system recovery from noise exposure is individualized and can lag behind threshold recovery.