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Repeated temporary threshold shift and changes in cochlear and neural function.

D S Morgan1, A A Arteaga2, N A Bosworth1

  • 1University of Mississippi Medical Center, Department of Otolaryngology and Communicative Sciences, USA; University of Mississippi Medical Center, School of Medicine, USA.

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|August 23, 2019
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Summary
This summary is machine-generated.

Repeated noise exposure did not cause lasting auditory damage, even if initial exposures caused temporary threshold shifts. This suggests the auditory system may adapt to repeated noise, preventing cochlear synaptopathy.

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Area of Science:

  • Auditory Neuroscience
  • Otoacoustic Emissions
  • Neurophysiology

Background:

  • Temporary threshold shift (TTS) can lead to cochlear synaptopathy (CS), damaging auditory synapses.
  • Current research models CS using single or extended high-dose noise exposures.
  • The impact of non-damaging noise exposures on CS development is not well understood.

Purpose of the Study:

  • To investigate if repeated noise exposures, not individually causing CS, can induce pathological changes.
  • To examine the effects of repeated TTS on cochlear function and auditory neural integrity.

Main Methods:

  • 16-week-old Sprague-Dawley rats were exposed to octave-band noise (8-16 kHz, 97 dB SPL, 2h) for 4 consecutive days.
  • Cochlear function was assessed using distortion product otoacoustic emissions.
  • Auditory neural integrity was measured via auditory brainstem response (wave 1 amplitude).

Main Results:

  • Initial noise exposure caused a maximal threshold shift of 16 dB.
  • Subsequent daily exposures led to reduced threshold shifts.
  • No sustained reduction in suprathreshold responses was observed, indicating recovered thresholds.

Conclusions:

  • Repeated TTS, even if not individually synaptopathic, did not produce physiological evidence of acute CS.
  • Findings align with conditioning literature, suggesting diminished TTS with repeated exposures.
  • The auditory system may exhibit adaptive mechanisms against cumulative damage from non-damaging noise insults.