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

Federica Bianchi, Michal Fereczkowski, Johannes Zaar, Sébastien Santurette, Torsten Dau

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    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 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 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.
    Original languageEnglish
    Title of host publicationProceedings of ISAAR 2015
    EditorsS. Santurette, T. Dau, J. C. Dalsgaard, T. Tranebjærg, T. Andersen
    Number of pages8
    Publication date2015
    ISBN (Print)978-87-990013-5-4
    Publication statusPublished - 2015
    Event5th International Symposium on Auditory and Audiological Research - Nyborg, Denmark
    Duration: 26 Aug 201528 Aug 2015
    Conference number: 5
    http://www.isaar.eu/

    Conference

    Conference5th International Symposium on Auditory and Audiological Research
    Number5
    Country/TerritoryDenmark
    CityNyborg
    Period26/08/201528/08/2015
    Internet address

    Fingerprint

    Dive into the research topics of 'Effects of cochlear compression and frequency selectivity on pitch discrimination of complex tones with unresolved harmonics'. Together they form a unique fingerprint.

    Cite this