Frequency selectivity in noise-exposed chinchillas

Details

• Personal Author:
  Ahroon WA ; Davis RI ; Hamernik RP ; Turrentine GA
• Description:
  A report on frequency selectivity in noised exposed chinchillas was presented. Auditory evoked potential tuning curves were collected on more than 300 noise exposed chinchillas for which both sensory cell loss data and threshold shift data were available. Additionally, tuning curve variables were related to the amount of noise induced permanent threshold shift and sensory cell loss along the cochlea; this analysis was performed in discrete octave bands along the entire length of the cochlea. A systemic relation between the degree of permanent threshold shift, abnormal outer hair cell populations, and changes in tuning were observed. Tuning was not significantly altered in noise exposed cochleas with less than 5 decibels of permanent threshold shift and less than 5% sensory cell damage. The tuning curve was not a sensitive measure of cochlea condition in the presence of considerable sensory cell damage and small permanent threshold shift. Tuning was reduced in both normal and damaged regions of the cochlea when cell loss was restricted to the apical and middle portion of the cochlea. For high frequency lesions, changes in tuning were limited to the region of outer hair cell loss. The low frequency slope appeared to be a more sensitive indicator of noise induced cochlear lesion than the high frequency slope. [Description provided by NIOSH]
• Subjects:
  Ear Hearing Loss Hearing Loss, Noise-Induced Laboratories Noise Noise, Occupational Occupational Health Safety Sense Organs
• Keywords:
  Auditory-system Ear-disorders Hearing-impairment Laboratory-animals NIOSH-Grant Noise-exposure Noise-frequencies Noise-induced-hearing-loss Sensory-disorders
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Proceedings
• Place as Subject:
  New York ; OSHA Region 2
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  114-128
• NIOSHTIC Number:
  nn:00214053
• Citation:
  120th Annual Meeting of the Acoustical Society of America, :114-128
• Contact Point Address:
  Communicative Disorders & Scis Research Foundation of Suny P O Box 9 Albany, N Y 12201
• Federal Fiscal Year:
  1990
• Performing Organization:
  State University of New York at Albany
• Peer Reviewed:
  False
• Start Date:
  19860301
• Source Full Name:
  120th Annual Meeting of the Acoustical Society of America
• End Date:
  20130514
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:cc9f6ebca0a464cc7c80f5c2df999157e7c72a296feee78a569842dd20abab0cf32fee2806e479cdc05701c525caf74ab249d92332edcd85224991e328ef15fc
• Download URL:
  https://stacks.cdc.gov/view/cdc/204797/cdc_204797_DS1.pdf
• File Type:
  [PDF - 314.50 KB ]