Frequency-shaped amplification changes the neural representation of speech with noise-induced hearing loss

John R. Schilling, Roger L. Miller, Murray B. Sachs, Eric D. Young

Research output: Contribution to journalArticle

Abstract

Temporal response patterns of single auditory nerve fibers were used to characterize the effects of a common hearing-aid processing scheme, frequency-shaped amplification, on the encoding of the vowel /ε/ in cats with a permanent noise-induced hearing loss. These responses were contrasted with responses to unmodified stimuli in control and impaired cats. Noise- induced hearing loss leads to a degraded representation of the formant frequencies, in which strong phase locking to the formants is not observed in fibers with best frequencies (BFs) near the formants and there is a wide spread of formant phase locking to fibers with higher BFs (Miller et al., 1997a,b). Frequency shaping effectively limits the upward spread of locking to F1, which improves the representation of higher frequency components of the vowel. However, it also increases phase locking to harmonics in the trough between the formants, which decreases the contrast between F1 and the trough in the neural representation. Moreover, it does not prevent the spread to higher BFs of responses to the second and third formants. The results show a beneficial effect of frequency shaping, but also show that interactions between particular gain functions and particular spectral shapes can result in unwanted distortions of the neural representation of the signal.

Original languageEnglish (US)
Pages (from-to)57-70
Number of pages14
JournalHearing Research
Volume117
Issue number1-2
DOIs
StatePublished - Mar 1998

Fingerprint

Noise-Induced Hearing Loss
Cats
Cochlear Nerve
Hearing Aids
Nerve Fibers

Keywords

  • Auditory nerve
  • Hearing aid
  • Noise-induced hearing loss
  • Speech

ASJC Scopus subject areas

  • Sensory Systems

Cite this

Frequency-shaped amplification changes the neural representation of speech with noise-induced hearing loss. / Schilling, John R.; Miller, Roger L.; Sachs, Murray B.; Young, Eric D.

In: Hearing Research, Vol. 117, No. 1-2, 03.1998, p. 57-70.

Research output: Contribution to journalArticle

Schilling, John R. ; Miller, Roger L. ; Sachs, Murray B. ; Young, Eric D. / Frequency-shaped amplification changes the neural representation of speech with noise-induced hearing loss. In: Hearing Research. 1998 ; Vol. 117, No. 1-2. pp. 57-70.
@article{54ac2b9302564f7bb0dcd000b4143c81,
title = "Frequency-shaped amplification changes the neural representation of speech with noise-induced hearing loss",
abstract = "Temporal response patterns of single auditory nerve fibers were used to characterize the effects of a common hearing-aid processing scheme, frequency-shaped amplification, on the encoding of the vowel /ε/ in cats with a permanent noise-induced hearing loss. These responses were contrasted with responses to unmodified stimuli in control and impaired cats. Noise- induced hearing loss leads to a degraded representation of the formant frequencies, in which strong phase locking to the formants is not observed in fibers with best frequencies (BFs) near the formants and there is a wide spread of formant phase locking to fibers with higher BFs (Miller et al., 1997a,b). Frequency shaping effectively limits the upward spread of locking to F1, which improves the representation of higher frequency components of the vowel. However, it also increases phase locking to harmonics in the trough between the formants, which decreases the contrast between F1 and the trough in the neural representation. Moreover, it does not prevent the spread to higher BFs of responses to the second and third formants. The results show a beneficial effect of frequency shaping, but also show that interactions between particular gain functions and particular spectral shapes can result in unwanted distortions of the neural representation of the signal.",
keywords = "Auditory nerve, Hearing aid, Noise-induced hearing loss, Speech",
author = "Schilling, {John R.} and Miller, {Roger L.} and Sachs, {Murray B.} and Young, {Eric D.}",
year = "1998",
month = "3",
doi = "10.1016/S0378-5955(98)00003-3",
language = "English (US)",
volume = "117",
pages = "57--70",
journal = "Hearing Research",
issn = "0378-5955",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Frequency-shaped amplification changes the neural representation of speech with noise-induced hearing loss

AU - Schilling, John R.

AU - Miller, Roger L.

AU - Sachs, Murray B.

AU - Young, Eric D.

PY - 1998/3

Y1 - 1998/3

N2 - Temporal response patterns of single auditory nerve fibers were used to characterize the effects of a common hearing-aid processing scheme, frequency-shaped amplification, on the encoding of the vowel /ε/ in cats with a permanent noise-induced hearing loss. These responses were contrasted with responses to unmodified stimuli in control and impaired cats. Noise- induced hearing loss leads to a degraded representation of the formant frequencies, in which strong phase locking to the formants is not observed in fibers with best frequencies (BFs) near the formants and there is a wide spread of formant phase locking to fibers with higher BFs (Miller et al., 1997a,b). Frequency shaping effectively limits the upward spread of locking to F1, which improves the representation of higher frequency components of the vowel. However, it also increases phase locking to harmonics in the trough between the formants, which decreases the contrast between F1 and the trough in the neural representation. Moreover, it does not prevent the spread to higher BFs of responses to the second and third formants. The results show a beneficial effect of frequency shaping, but also show that interactions between particular gain functions and particular spectral shapes can result in unwanted distortions of the neural representation of the signal.

AB - Temporal response patterns of single auditory nerve fibers were used to characterize the effects of a common hearing-aid processing scheme, frequency-shaped amplification, on the encoding of the vowel /ε/ in cats with a permanent noise-induced hearing loss. These responses were contrasted with responses to unmodified stimuli in control and impaired cats. Noise- induced hearing loss leads to a degraded representation of the formant frequencies, in which strong phase locking to the formants is not observed in fibers with best frequencies (BFs) near the formants and there is a wide spread of formant phase locking to fibers with higher BFs (Miller et al., 1997a,b). Frequency shaping effectively limits the upward spread of locking to F1, which improves the representation of higher frequency components of the vowel. However, it also increases phase locking to harmonics in the trough between the formants, which decreases the contrast between F1 and the trough in the neural representation. Moreover, it does not prevent the spread to higher BFs of responses to the second and third formants. The results show a beneficial effect of frequency shaping, but also show that interactions between particular gain functions and particular spectral shapes can result in unwanted distortions of the neural representation of the signal.

KW - Auditory nerve

KW - Hearing aid

KW - Noise-induced hearing loss

KW - Speech

UR - http://www.scopus.com/inward/record.url?scp=0031945435&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031945435&partnerID=8YFLogxK

U2 - 10.1016/S0378-5955(98)00003-3

DO - 10.1016/S0378-5955(98)00003-3

M3 - Article

C2 - 9557978

AN - SCOPUS:0031945435

VL - 117

SP - 57

EP - 70

JO - Hearing Research

JF - Hearing Research

SN - 0378-5955

IS - 1-2

ER -