Binaural Pitch Fusion: Effects of Amplitude Modulation

Yonghee Oh, Lina Reiss

Research output: Contribution to journalArticle

Abstract

Hearing-impaired adults, including both cochlear implant and bilateral hearing aid (HA) users, often exhibit broad binaural pitch fusion, meaning that they fuse dichotically presented tones with large pitch differences between ears. The current study was designed to investigate how binaural pitch fusion can be influenced by amplitude modulation (AM) of the stimuli and whether effects differ with hearing loss. Fusion ranges, the frequency ranges over which binaural pitch fusion occurs, were measured in both normal-hearing (NH) listeners and HA users with various coherent AM rates (2, 4, and 8 Hz); AM depths (20%, 40%, 60%, 80%, and 100%); and interaural AM phase and AM rate differences. The averaged results show that coherent AM increased binaural pitch fusion ranges to about 2 to 4 times wider than those in the unmodulated condition in both NH and bilateral HA subjects. Even shallow temporal envelope fluctuations (20% AM depth) significantly increased fusion ranges in all three coherent AM rate conditions. Incoherent AM introduced through interaural differences in AM phase or AM rate led to smaller increases in binaural pitch fusion range compared with those observed with coherent AM. Significant differences between groups were observed only in the coherent AM conditions. The influence of AM cues on binaural pitch fusion shows that binaural fusion is mediated in part by central processes involved in auditory grouping.

Original languageEnglish (US)
JournalTrends in hearing
Volume22
DOIs
StatePublished - Jan 1 2018

Fingerprint

Hearing Aids
Hearing
Cochlear Implants
Hearing Loss
Cues
Ear

Keywords

  • amplitude modulation
  • binaural pitch fusion
  • temporal coherence

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Speech and Hearing

Cite this

Binaural Pitch Fusion : Effects of Amplitude Modulation. / Oh, Yonghee; Reiss, Lina.

In: Trends in hearing, Vol. 22, 01.01.2018.

Research output: Contribution to journalArticle

@article{09946a165b154655b1060c4a1ef38dde,
title = "Binaural Pitch Fusion: Effects of Amplitude Modulation",
abstract = "Hearing-impaired adults, including both cochlear implant and bilateral hearing aid (HA) users, often exhibit broad binaural pitch fusion, meaning that they fuse dichotically presented tones with large pitch differences between ears. The current study was designed to investigate how binaural pitch fusion can be influenced by amplitude modulation (AM) of the stimuli and whether effects differ with hearing loss. Fusion ranges, the frequency ranges over which binaural pitch fusion occurs, were measured in both normal-hearing (NH) listeners and HA users with various coherent AM rates (2, 4, and 8 Hz); AM depths (20{\%}, 40{\%}, 60{\%}, 80{\%}, and 100{\%}); and interaural AM phase and AM rate differences. The averaged results show that coherent AM increased binaural pitch fusion ranges to about 2 to 4 times wider than those in the unmodulated condition in both NH and bilateral HA subjects. Even shallow temporal envelope fluctuations (20{\%} AM depth) significantly increased fusion ranges in all three coherent AM rate conditions. Incoherent AM introduced through interaural differences in AM phase or AM rate led to smaller increases in binaural pitch fusion range compared with those observed with coherent AM. Significant differences between groups were observed only in the coherent AM conditions. The influence of AM cues on binaural pitch fusion shows that binaural fusion is mediated in part by central processes involved in auditory grouping.",
keywords = "amplitude modulation, binaural pitch fusion, temporal coherence",
author = "Yonghee Oh and Lina Reiss",
year = "2018",
month = "1",
day = "1",
doi = "10.1177/2331216518788972",
language = "English (US)",
volume = "22",
journal = "Trends in hearing",
issn = "1084-7138",
publisher = "SAGE Publications Inc.",

}

TY - JOUR

T1 - Binaural Pitch Fusion

T2 - Effects of Amplitude Modulation

AU - Oh, Yonghee

AU - Reiss, Lina

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Hearing-impaired adults, including both cochlear implant and bilateral hearing aid (HA) users, often exhibit broad binaural pitch fusion, meaning that they fuse dichotically presented tones with large pitch differences between ears. The current study was designed to investigate how binaural pitch fusion can be influenced by amplitude modulation (AM) of the stimuli and whether effects differ with hearing loss. Fusion ranges, the frequency ranges over which binaural pitch fusion occurs, were measured in both normal-hearing (NH) listeners and HA users with various coherent AM rates (2, 4, and 8 Hz); AM depths (20%, 40%, 60%, 80%, and 100%); and interaural AM phase and AM rate differences. The averaged results show that coherent AM increased binaural pitch fusion ranges to about 2 to 4 times wider than those in the unmodulated condition in both NH and bilateral HA subjects. Even shallow temporal envelope fluctuations (20% AM depth) significantly increased fusion ranges in all three coherent AM rate conditions. Incoherent AM introduced through interaural differences in AM phase or AM rate led to smaller increases in binaural pitch fusion range compared with those observed with coherent AM. Significant differences between groups were observed only in the coherent AM conditions. The influence of AM cues on binaural pitch fusion shows that binaural fusion is mediated in part by central processes involved in auditory grouping.

AB - Hearing-impaired adults, including both cochlear implant and bilateral hearing aid (HA) users, often exhibit broad binaural pitch fusion, meaning that they fuse dichotically presented tones with large pitch differences between ears. The current study was designed to investigate how binaural pitch fusion can be influenced by amplitude modulation (AM) of the stimuli and whether effects differ with hearing loss. Fusion ranges, the frequency ranges over which binaural pitch fusion occurs, were measured in both normal-hearing (NH) listeners and HA users with various coherent AM rates (2, 4, and 8 Hz); AM depths (20%, 40%, 60%, 80%, and 100%); and interaural AM phase and AM rate differences. The averaged results show that coherent AM increased binaural pitch fusion ranges to about 2 to 4 times wider than those in the unmodulated condition in both NH and bilateral HA subjects. Even shallow temporal envelope fluctuations (20% AM depth) significantly increased fusion ranges in all three coherent AM rate conditions. Incoherent AM introduced through interaural differences in AM phase or AM rate led to smaller increases in binaural pitch fusion range compared with those observed with coherent AM. Significant differences between groups were observed only in the coherent AM conditions. The influence of AM cues on binaural pitch fusion shows that binaural fusion is mediated in part by central processes involved in auditory grouping.

KW - amplitude modulation

KW - binaural pitch fusion

KW - temporal coherence

UR - http://www.scopus.com/inward/record.url?scp=85054821887&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054821887&partnerID=8YFLogxK

U2 - 10.1177/2331216518788972

DO - 10.1177/2331216518788972

M3 - Article

C2 - 30027804

AN - SCOPUS:85054821887

VL - 22

JO - Trends in hearing

JF - Trends in hearing

SN - 1084-7138

ER -