Resolving front-back ambiguity with head rotation: the role of level dynamics

Henri Pöntynen, Nelli Salminen

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    16 Sitaatiot (Scopus)
    227 Lataukset (Pure)

    Abstrakti

    Making small head movements facilitates spatial hearing by resolving front-back confusions, otherwise common in free field sound source localization. The changes in interaural time difference (ITD) in response to head rotation provide a robust front-back cue, but whether interaural level difference (ILD) can be used as a dynamic cue is not clear. Therefore, the purpose of the present study was to assess the usefulness of dynamic ILD as a localization cue. The results show that human listeners were capable of correctly indicating the front-back dimension of high-frequency sinusoids based on level dynamics in free field conditions, but only if a wide movement range was allowed (±40∘). When the free field conditions were replaced by simplistic headphone stimulation, front-back responses were in agreement with the simulated source directions even with relatively small movement ranges (±5∘), whenever monaural sound level and ILD changed monotonically in response to head rotation. In conclusion, human listeners can use level dynamics as a front-back localization cue when the dynamics are monotonic. However, in free field conditions and particularly for narrowband target signals, this is often not the case. Therefore, the primary limiting factor in the use of dynamic level cues resides in the acoustic domain behavior of the cue itself, rather than in potential processing limitations or strategies of the human auditory system.
    AlkuperäiskieliEnglanti
    Sivut196-207
    Sivumäärä12
    JulkaisuHearing Research
    Vuosikerta377
    Varhainen verkossa julkaisun päivämäärä2019
    DOI - pysyväislinkit
    TilaJulkaistu - 1 kesäk. 2019
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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    • Tilakuulon moniaistilliset aivomekanismit

      Salminen, N. (Vastuullinen tutkija)

      01/09/201615/08/2019

      Projekti: Academy of Finland: Other research funding

    • Tilakuulon moniaistilliset aivomekanismit

      Pulkki, V. (Vastuullinen tutkija), Pöntynen, H. (Projektin jäsen) & Hyvärinen, P. (Projektin jäsen)

      01/09/201607/07/2020

      Projekti: Academy of Finland: Other research funding

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