Discriminability of vowel representations in cat auditory-nerve fibers after acoustic trauma

Roger L. Miller, Barbara M. Calhoun, Eric D. Young

Research output: Contribution to journalArticle

Abstract

This paper attempts to connect deficits seen in the neural representation of speech with perceptual deficits. Responses of auditory- nerve fibers were studied in cats exposed to acoustic trauma. Four synthetic steady-state vowels were used as test signals; these stimuli are identical, except that the second formant (F2) resonator in the synthesizer was set to 1.4, 115, 1.7, or 2 kHz, producing four spectra that differ mainly in the vicinity of the F2 frequency. These stimuli were presented to a large population (523) of auditory-nerve fibers in four cats with sloping high- frequency threshold shifts that reached 50-70 dB at 2-4 kHz. In normal animals, May et al. [Auditory Neurosci. 3, 135-162 (1996)] showed previously that the discharge rates of fibers with best frequencies near the F2 frequencies provide enough information to allow discrimination of these stimuli at the performance levels shown by cats in behavioral experiments. Here it is shown that, after acoustic trauma, there is essentially no rate information which would allow the vowels with different F2 frequencies to be discriminated. However, information that could allow discrimination remains in the temporal (phase-locked) aspects of the responses.

Original languageEnglish (US)
Pages (from-to)311-325
Number of pages15
JournalJournal of the Acoustical Society of America
Volume105
Issue number1
DOIs
StatePublished - Jan 1999

Fingerprint

nerve fibers
vowels
cats
stimuli
acoustics
discrimination
synthesizers
animals
resonators
fibers
thresholds
Acoustics
Hearing
Fiber
Nerve
Trauma
Stimulus

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Discriminability of vowel representations in cat auditory-nerve fibers after acoustic trauma. / Miller, Roger L.; Calhoun, Barbara M.; Young, Eric D.

In: Journal of the Acoustical Society of America, Vol. 105, No. 1, 01.1999, p. 311-325.

Research output: Contribution to journalArticle

Miller, Roger L. ; Calhoun, Barbara M. ; Young, Eric D. / Discriminability of vowel representations in cat auditory-nerve fibers after acoustic trauma. In: Journal of the Acoustical Society of America. 1999 ; Vol. 105, No. 1. pp. 311-325.
@article{0eaecac682744cfab215b0c49eefb99a,
title = "Discriminability of vowel representations in cat auditory-nerve fibers after acoustic trauma",
abstract = "This paper attempts to connect deficits seen in the neural representation of speech with perceptual deficits. Responses of auditory- nerve fibers were studied in cats exposed to acoustic trauma. Four synthetic steady-state vowels were used as test signals; these stimuli are identical, except that the second formant (F2) resonator in the synthesizer was set to 1.4, 115, 1.7, or 2 kHz, producing four spectra that differ mainly in the vicinity of the F2 frequency. These stimuli were presented to a large population (523) of auditory-nerve fibers in four cats with sloping high- frequency threshold shifts that reached 50-70 dB at 2-4 kHz. In normal animals, May et al. [Auditory Neurosci. 3, 135-162 (1996)] showed previously that the discharge rates of fibers with best frequencies near the F2 frequencies provide enough information to allow discrimination of these stimuli at the performance levels shown by cats in behavioral experiments. Here it is shown that, after acoustic trauma, there is essentially no rate information which would allow the vowels with different F2 frequencies to be discriminated. However, information that could allow discrimination remains in the temporal (phase-locked) aspects of the responses.",
author = "Miller, {Roger L.} and Calhoun, {Barbara M.} and Young, {Eric D.}",
year = "1999",
month = "1",
doi = "10.1121/1.424552",
language = "English (US)",
volume = "105",
pages = "311--325",
journal = "Journal of the Acoustical Society of America",
issn = "0001-4966",
publisher = "Acoustical Society of America",
number = "1",

}

TY - JOUR

T1 - Discriminability of vowel representations in cat auditory-nerve fibers after acoustic trauma

AU - Miller, Roger L.

AU - Calhoun, Barbara M.

AU - Young, Eric D.

PY - 1999/1

Y1 - 1999/1

N2 - This paper attempts to connect deficits seen in the neural representation of speech with perceptual deficits. Responses of auditory- nerve fibers were studied in cats exposed to acoustic trauma. Four synthetic steady-state vowels were used as test signals; these stimuli are identical, except that the second formant (F2) resonator in the synthesizer was set to 1.4, 115, 1.7, or 2 kHz, producing four spectra that differ mainly in the vicinity of the F2 frequency. These stimuli were presented to a large population (523) of auditory-nerve fibers in four cats with sloping high- frequency threshold shifts that reached 50-70 dB at 2-4 kHz. In normal animals, May et al. [Auditory Neurosci. 3, 135-162 (1996)] showed previously that the discharge rates of fibers with best frequencies near the F2 frequencies provide enough information to allow discrimination of these stimuli at the performance levels shown by cats in behavioral experiments. Here it is shown that, after acoustic trauma, there is essentially no rate information which would allow the vowels with different F2 frequencies to be discriminated. However, information that could allow discrimination remains in the temporal (phase-locked) aspects of the responses.

AB - This paper attempts to connect deficits seen in the neural representation of speech with perceptual deficits. Responses of auditory- nerve fibers were studied in cats exposed to acoustic trauma. Four synthetic steady-state vowels were used as test signals; these stimuli are identical, except that the second formant (F2) resonator in the synthesizer was set to 1.4, 115, 1.7, or 2 kHz, producing four spectra that differ mainly in the vicinity of the F2 frequency. These stimuli were presented to a large population (523) of auditory-nerve fibers in four cats with sloping high- frequency threshold shifts that reached 50-70 dB at 2-4 kHz. In normal animals, May et al. [Auditory Neurosci. 3, 135-162 (1996)] showed previously that the discharge rates of fibers with best frequencies near the F2 frequencies provide enough information to allow discrimination of these stimuli at the performance levels shown by cats in behavioral experiments. Here it is shown that, after acoustic trauma, there is essentially no rate information which would allow the vowels with different F2 frequencies to be discriminated. However, information that could allow discrimination remains in the temporal (phase-locked) aspects of the responses.

UR - http://www.scopus.com/inward/record.url?scp=0032918723&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032918723&partnerID=8YFLogxK

U2 - 10.1121/1.424552

DO - 10.1121/1.424552

M3 - Article

C2 - 9921658

AN - SCOPUS:0032918723

VL - 105

SP - 311

EP - 325

JO - Journal of the Acoustical Society of America

JF - Journal of the Acoustical Society of America

SN - 0001-4966

IS - 1

ER -