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2009 | 15 | 3 | 143-152

Article title

Fitting of hearing aids with different technical parameters to a patient with dead regions


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The purpose of the study was to determine an optimal hearing aid fitting procedure for a patient with well diagnosed high-frequency ‘dead regions’ in both cochleas. The patient reported non-symmetrical hearing problems of sensorineural origin. For binaural amplification two similar independent hearing aids were used as well as a pair of dependent devices with an ear-to-ear function. Two fitting methods were used: DSLi/o and NAL-NL1, and four different strategies of fitting were tested: the initial fitting based on the DSLi/o or NAL-NL1 method with necessary loudness corrections, the second fitting taking into account all the available functions of hearing instruments, the third fitting (based on the second one) but with significantly reduced amplification well above one octave of frequency inside dead region, and the final fitting with significantly reduced gain slightly below one octave inside dead regions. The results of hearing aids fitting were assessed using an APHAB procedure.









Physical description


1 - 1 - 2009
22 - 9 - 2010


  • Department of Biophysics, Poznan University of Medical Science, Poznan, Poland
  • Institute of Acoustics, A. Mickiewicz University Poznan, Poland


  • Baer T, Moore BCJ, Kluk K. Effects of low-pass filtering on intelligibility of speech in noise for people with and without dead region. J Acoust Soc Am. 2002; 112: 1133-1144.[PubMed][Crossref]
  • Cornelisse LE, Seewald RC, Jamieson DG. The input/output formula: a theoretical approach to the fitting of personal amplification devices. J Acoust Soc Am. 1995; 97: 1854-1864.[PubMed][Crossref]
  • Cox R, Alexander G. The Abbreviated Profile of Hearing Aid Benefit. Ear Hearing. 1995; 16: 176-186.[Crossref]
  • Dillon H. NAL-NL1: A new prescriptive fitting procedure for non-linear hearing aids. Hearing J. 1999; 52: 10-16.
  • Hojan-Jezierska D, Skrodzka E. Application of Cochlear Dead Regions Diagnosis into the Hearing Instrument Fitting Process - a Particular Case. Arch Acoust. Forthcoming 2009.
  • Moore BCJ, Huss M, Vickers DA, Glasberg BR, Alcantara JI. A test for the diagnosis of dead regions in the cochlea. Br J Audiol. 2000; 34: 205-224.
  • Moore BCJ. Dead regions in the cochlea: conceptual foundations, diagnosis, and clinical applications. Ear Hearing. 2004; 25: 98-116.[Crossref]
  • Munro KJ. Integrating cochlear dead regions diagnosis into the hearing instrument fitting process. Phonak Focus 38. 2007 [cited 2009]. Available from: http://www.phonak.com/com_028-0599-xx_focus_38.pdf
  • Vickers DA, Moore BCJ, Baer T. Effects of lowpass filtering on the intelligibility of speech in quiet for people with and without dead regions at high frequencies. J Acoust Soc Am. 2001; 110: 1164-1175.[Crossref]

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