Effects of cochlear compression and frequency selectivity on pitch discrimination of complex tones with unresolved harmonics

  • Federica Bianchi Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
  • Michal Fereczkowski Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
  • Johannes Zaar Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
  • Sébastien Santurette Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark http://orcid.org/0000-0002-6868-5734
  • Torsten Dau Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark

Abstract

Physiological studies have shown that noise-induced sensorineural hearing loss (SNHL) enhances the amplitude of envelope coding in auditory-nerve fibers. As pitch coding of unresolved complex tones is assumed to rely on temporal envelope coding mechanisms, this study investigated pitch-discrimination performance in listeners with SNHL. Pitch-discrimination thresholds were obtained in 14 normal-hearing (NH) and 10 hearing-impaired (HI) listeners for sine-phase (SP) and random-phase (RP) unresolved complex tones. The HI listeners performed, on average, similarly as the NH listeners in the SP condition and worse than NH listeners in the RP condition. Cochlear compression and auditory filter bandwidths were estimated in the same listeners. A significant correlation was found between the reduction of cochlear compression and the difference between RP and SP pitch-discrimination thresholds. The effects of degraded frequency selectivity and loss of compression were considered in a model as potential factors in envelope enhancement. The model revealed that a broadening of the auditory filters led to an increase of the modulation depth in the SP condition, while it did not have any effect for the RP condition. Overall, these findings suggest that both reduced cochlear compression and auditory filter broadening alter the envelope representation of unresolved complex tones, leading to changes in pitch-discrimination performance.

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Published
2015-12-15
How to Cite
BIANCHI, Federica et al. Effects of cochlear compression and frequency selectivity on pitch discrimination of complex tones with unresolved harmonics. Proceedings of the International Symposium on Auditory and Audiological Research, [S.l.], v. 5, p. 51-58, dec. 2015. Available at: <https://proceedings.isaar.eu/index.php/isaarproc/article/view/2015-06>. Date accessed: 18 dec. 2017.
Section
2015/1. Characterizing individual differences in hearing loss