Amplitude Modulation Thresholds in Chinchillas with High-Frequency Hearing Loss

Details

• Personal Author:
  Hamernik R ; Henderson D ; Pavek J ; Salvi R
• Description:
  Estimates of auditory temporal resolution were obtained from normal chinchillas using sinusoidally amplitude modulated noise. Afterwards, the animals were exposed to noise whose bandwidth was progressively increased toward the low frequencies in octave steps. The first exposure was to an octave band of noise centered at 8 kHz. Three additional octave bands of noise were subsequently added to the original exposure in order to progressively increase the extent of the high-frequency hearing loss. The first exposure produced a temporary hearing loss of 50 to 60 dB near 8 kHz and elevated the amplitude modulation thresholds primarily at intermediate (128 Hz) modulation frequencies. Successive noise exposures extended the temporary hearing loss toward lower frequencies, but there was little further deterioration in the amplitude modulation function until the last exposure when the hearing loss spread to 1 kHz. The degradation in the amplitude modulation function observed after the last exposure, however, was due to a reduction in the sensation level of the test signal rather than to a decrease in the hearing bandwidth. The results of this study suggest that the high-frequency regions of the cochlea may be important for temporal resolution. [Description provided by NIOSH]
• Subjects:
  Animals Hearing Loss Hearing Loss, Noise-Induced Noise Noise, Occupational Occupational Health Safety
• Keywords:
  Animal Studies Auditory System Exposure Assessment Hearing Loss Noise Frequencies Noise Induced Hearing Loss
• ISSN:
  0001-4966
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  New York ; OSHA Region 2 ; OSHA Region 6 ; Texas
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  75
• Issue:
  4
• NIOSHTIC Number:
  nn:20060646
• Citation:
  J Acoust Soc Am 1984 Apr; 75(4):1177-1183
• Federal Fiscal Year:
  1984
• Performing Organization:
  Upstate Medical Center, Syracuse, New York
• Peer Reviewed:
  True
• Start Date:
  19720501
• Source Full Name:
  Journal of the Acoustical Society of America
• End Date:
  19800630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a83898fda9d9d466a63f74ecb02d4112422d044c181b4c993797ead5a8c74c443e154fa170ec4b893457eedb371918fe65f1060805f253e2ff3e45c95b9ed6c1
• Download URL:
  https://stacks.cdc.gov/view/cdc/224495/cdc_224495_DS1.pdf
• File Type:
  [PDF - 230.31 KB ]