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

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Resolving front-back ambiguity with head rotation: the role of level dynamics. / Pöntynen, Henri; Salminen, Nelli.

julkaisussa: Hearing Research, Vuosikerta 377, 01.06.2019, s. 196-207.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Bibtex - Lataa

@article{e4e864cbab1340c6ae5b9e7b0c309c75,
title = "Resolving front-back ambiguity with head rotation: the role of level dynamics",
abstract = "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.",
keywords = "active localization, head rotation, front-back ambiguity, binaural cues, directional bands, acoustic bright spot, Head rotation, Active localization, Front-back ambiguity, Directional bands, Acoustic bright spot, Binaural cues",
author = "Henri P{\"o}ntynen and Nelli Salminen",
year = "2019",
month = "6",
day = "1",
doi = "10.1016/j.heares.2019.03.020",
language = "English",
volume = "377",
pages = "196--207",
journal = "Hearing Research",
issn = "0378-5955",

}

RIS - Lataa

TY - JOUR

T1 - Resolving front-back ambiguity with head rotation: the role of level dynamics

AU - Pöntynen, Henri

AU - Salminen, Nelli

PY - 2019/6/1

Y1 - 2019/6/1

N2 - 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.

AB - 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.

KW - active localization

KW - head rotation

KW - front-back ambiguity

KW - binaural cues

KW - directional bands

KW - acoustic bright spot

KW - Head rotation

KW - Active localization

KW - Front-back ambiguity

KW - Directional bands

KW - Acoustic bright spot

KW - Binaural cues

UR - http://www.scopus.com/inward/record.url?scp=85064083723&partnerID=8YFLogxK

U2 - 10.1016/j.heares.2019.03.020

DO - 10.1016/j.heares.2019.03.020

M3 - Article

VL - 377

SP - 196

EP - 207

JO - Hearing Research

JF - Hearing Research

SN - 0378-5955

ER -

ID: 32944094