Bianchi, Federica

Dau, Torsten

Fereczkowski, Michal

Santurette, Sébastien

Zaar, Johannes

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 pitchdiscrimination performance in listeners with SNHL. Pitch-discrimination thresholds were obtained in 14 normal-hearing (NH) and 10 hearingimpaired (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 betweenthe 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

Online Research Database In Technology

Effects of cochlear compression and frequency selectivity on pitch discrimination ofcomplex tones with unresolved harmonics - DTU Orbit (08/11/2017) Effects of cochlear compression and frequency selectivity on pitch discrimination of complex tones with unresolvedharmonicsPhysiological studies have shown that noise-induced sensorineural hearing loss (SNHL) enhances the amplitude ofenvelope coding in auditory-nerve fibers. As pitch coding of unresolved complex tones is assumed to rely on temporalenvelope coding mechanisms, this study investigated pitchdiscrimination performance in listeners with SNHL. Pitch-discrimination thresholds were obtained in 14 normal-hearing (NH) and 10 hearingimpaired (HI) listeners for sine-phase(SP) and random-phase (RP) unresolved complex tones. The HI listeners performed, on average, similarly as the NHlisteners in the SP condition and worse than NH listeners in the RP condition. Cochlear compression and auditory filterbandwidths 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 effectsof degraded frequency selectivity and loss of compression were considered in a model as potential factors in envelopeenhancement. The model revealed that a broadening of the auditory filters led to an increase of the modulation depth inthe SP condition, while it did not have any effect for the RP condition. Overall, these findings suggest that both reducedcochlear compression and auditory filter broadening alter the envelope representation of unresolved complex tones,leading to changes in pitch-discrimination performance.  General informationState: PublishedOrganisations: Department of Electrical Engineering, Hearing SystemsAuthors: Bianchi, F. (Intern), Fereczkowski, M. (Intern), Zaar, J. (Intern), Santurette, S. (Intern), Dau, T. (Intern)Number of pages: 8Publication date: 2015 Host publication informationTitle of host publication: Proceedings of ISAAR 2015Editors: Santurette, S., Dau, T., Dalsgaard, J. C., Tranebjærg, T., Andersen, T.ISBN (Print): 978-87-990013-5-4Main Research Area: Technical/natural sciencesConference: 5th International Symposium on Auditory and Audiological Research, Nyborg, Denmark, 26/08/2015 -26/08/2015Source: PublicationPreSubmissionSource-ID: 123023606Publication: Research - peer-review › Article in proceedings – Annual report year: 2016 

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

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

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