Modelling the effect of individual hearing impairment on sound localisation in sagittal planes


  • Robert Baumgartner Acoustics Research Institute, Austrian Academy of Sciences, Austria
  • Piotr Majdak Acoustics Research Institute, Austrian Academy of Sciences, Austria
  • Bernhard Laback Acoustics Research Institute, Austrian Academy of Sciences, Austria


Normal-hearing (NH) listeners use monaural spectral cues to localize sound sources in sagittal planes, including up-down and front-back directions. The salience of monaural spectral cues is determined by the spectral resolution and the dynamic range of the auditory system. Both factors are commonly degraded in impaired auditory systems. In order to simulate the effects of outer hair cell (OHC) dysfunction and loss of auditory nerve (AN) fibres on localisation performance, we incorporated a well-established model of the auditory periphery [Zilany et al., 2014, J. Acoust. Soc. Am. 135] into a recent model of sound localisation in sagittal planes [Baumgartner et al., 2014, J. Acoust. Soc. Am. 136]. The model was evaluated for NH listeners and then applied on conditions simulating various degrees of OHC dysfunction. The predicted localisation performance is hardly affected by a moderate OHC dysfunction but drastically degrades in case of a severe OHC dysfunction. When further applied on conditions simulating loss of AN fibres with specific spontaneous rates (SRs), predicted localisation performance degrades if only high-SR fibres are preserved.


Baumgartner, R., Majdak, P., and Laback, B. (2014). “Modeling sound-source locali-zation in sagittal planes for human listeners,” J. Acoust. Soc. Am., 136, 791-802.

Best, V., Carlile, S., Jin, C., and van Schaik, A. (2005). “The role of high frequencies in speech localization,” J. Acoust. Soc. Am., 118, 353-363.

Furman, A.C., Kujawa, S.G., and Liberman, M.C. (2013). “Noise-induced cochlear neuropathy is selective for fibers with low spontaneous rates,” J. Neurophysiol., 110, 577-586.

Goupell, M.J., Majdak, P., and Laback, B. (2010). “Median-plane sound localization as a function of the number of spectral channels using a channel vocoder,” J. Acoust. Soc. Am., 127, 990-1001.

Liberman, M.C. (1978). “Auditory-nerve response from cats raised in a low-noise chamber,” J. Acoust. Soc. Am., 63, 442-455.

Majdak, P., Walder, T., and Laback, B. (2013). “Effect of long-term training on sound localization performance with spectrally warped and band-limited head-related transfer functions,” J. Acoust. Soc. Am., 134, 2148-2159.

May, B.J., Budelis, J., and Niparko, J.K. (2004). “Behavioral studies of the olivocochlear efferent system: Learning to listen in noise,” Arch. Otolaryngol. Neck Surg., 130, 660-664.

Noble, W., Byrne, D., and Lepage, B. (1994). “Effects on sound localization of con-figuration and type of hearing impairment,” J. Acoust. Soc. Am., 95, 992-1005.

Otte, R.J., Agterberg, M.J.H., Wanrooij, M.M. V., Snik, A.F.M., and Opstal, A.J.V. (2013). “Age-related hearing loss and ear morphology affect vertical but not horizontal sound-localization performance,” J. Assoc. Res. Otolaryngol., 14, 261-273.

Rakerd, B., Vander Velde, T.J., and Hartmann, W.M. (1998). “Sound localization in the median sagittal plane by listeners with presbyacusis,” J. Am. Acad. Audiol., 9, 466-479.

Reiss, L.A.J. and Young, E.D. (2005). “Spectral edge sensitivity in neural circuits of the dorsal cochlear nucleus,” J. Neurosci., 25, 3680-3691.

Sabin, A.T., Macpherson, E.A., and Middlebrooks, J.C. (2005). “Human sound localization at near-threshold levels,” Hear. Res., 199, 124-134.

Zilany, M.S.A., Bruce, I.C., Nelson, P.C., and Carney, L.H. (2009). “A phenomeno-logical model of the synapse between the inner hair cell and auditory nerve: Long-term adaptation with power-law dynamics,” J. Acoust. Soc. Am., 126, 2390-2412.

Zilany, M.S.A., Bruce, I.C., and Carney, L.H. (2014). “Updated parameters and expanded simulation options for a model of the auditory periphery,” J. Acoust. Soc. Am., 135, 283-286.




How to Cite

Baumgartner, R., Majdak, P., & Laback, B. (2015). Modelling the effect of individual hearing impairment on sound localisation in sagittal planes. Proceedings of the International Symposium on Auditory and Audiological Research, 5, 165–172. Retrieved from