The representation of concurrent vowels in the cat anesthetized ventral cochlear nucleus: Evidence for a periodicity-tagged spectral representation

Suzanne E. Keilson, Virginia M. Richards, Bradley T. Wyman, Eric D. Young

Research output: Contribution to journalArticle

Abstract

Chopper units of the ventral cochlear nucleus (VCN) provide a rate representation of stimulus spectrum and a temporal representation of fundamental frequency (F0). This dual representation may be useful in segregating competing speech sounds, where differences in F0 are a cue. Responses to the vowel portion of concurrently presented pairs of syllables /bV∫/ with different F0's (88, 98, and 112 Hz) were studied in the VCN of anesthetized cats; 11 English vowels were used for V. Vowels were chosen so that one had a formant frequency just above the unit's best frequency (BF) and the other had a formant just below BF. By changing the stimulus sampling rate, formant peaks were shifted relative to the unit's BF, producing a range of stimuli, varying in the relative power of the two vowels within the unit's tuning curve. Results show that unit's discharge rates reflect the energy within their tuning curves and the relative synchronization of units' responses to the two F0's favors the dominant vowel. A method of segregating two vowels is provided in which relative synchronization to the F0's is used to apportion discharge rate between the vowels. Best results were obtained in chopper units, although primarylike units showed similar behavior.

Original languageEnglish (US)
Pages (from-to)1056-1071
Number of pages16
JournalJournal of the Acoustical Society of America
Volume102
Issue number2
DOIs
StatePublished - Aug 1997

Fingerprint

vowels
cats
periodic variations
nuclei
stimuli
electric choppers
synchronism
tuning
syllables
cues
curves
Spectrality
Nucleus
Stimulus
sampling
acoustics
Tuning
Synchronization
Formants

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

The representation of concurrent vowels in the cat anesthetized ventral cochlear nucleus : Evidence for a periodicity-tagged spectral representation. / Keilson, Suzanne E.; Richards, Virginia M.; Wyman, Bradley T.; Young, Eric D.

In: Journal of the Acoustical Society of America, Vol. 102, No. 2, 08.1997, p. 1056-1071.

Research output: Contribution to journalArticle

Keilson, Suzanne E. ; Richards, Virginia M. ; Wyman, Bradley T. ; Young, Eric D. / The representation of concurrent vowels in the cat anesthetized ventral cochlear nucleus : Evidence for a periodicity-tagged spectral representation. In: Journal of the Acoustical Society of America. 1997 ; Vol. 102, No. 2. pp. 1056-1071.
@article{51972847b1324eca87d12ec35f398f20,
title = "The representation of concurrent vowels in the cat anesthetized ventral cochlear nucleus: Evidence for a periodicity-tagged spectral representation",
abstract = "Chopper units of the ventral cochlear nucleus (VCN) provide a rate representation of stimulus spectrum and a temporal representation of fundamental frequency (F0). This dual representation may be useful in segregating competing speech sounds, where differences in F0 are a cue. Responses to the vowel portion of concurrently presented pairs of syllables /bV∫/ with different F0's (88, 98, and 112 Hz) were studied in the VCN of anesthetized cats; 11 English vowels were used for V. Vowels were chosen so that one had a formant frequency just above the unit's best frequency (BF) and the other had a formant just below BF. By changing the stimulus sampling rate, formant peaks were shifted relative to the unit's BF, producing a range of stimuli, varying in the relative power of the two vowels within the unit's tuning curve. Results show that unit's discharge rates reflect the energy within their tuning curves and the relative synchronization of units' responses to the two F0's favors the dominant vowel. A method of segregating two vowels is provided in which relative synchronization to the F0's is used to apportion discharge rate between the vowels. Best results were obtained in chopper units, although primarylike units showed similar behavior.",
author = "Keilson, {Suzanne E.} and Richards, {Virginia M.} and Wyman, {Bradley T.} and Young, {Eric D.}",
year = "1997",
month = "8",
doi = "10.1121/1.419859",
language = "English (US)",
volume = "102",
pages = "1056--1071",
journal = "Journal of the Acoustical Society of America",
issn = "0001-4966",
publisher = "Acoustical Society of America",
number = "2",

}

TY - JOUR

T1 - The representation of concurrent vowels in the cat anesthetized ventral cochlear nucleus

T2 - Evidence for a periodicity-tagged spectral representation

AU - Keilson, Suzanne E.

AU - Richards, Virginia M.

AU - Wyman, Bradley T.

AU - Young, Eric D.

PY - 1997/8

Y1 - 1997/8

N2 - Chopper units of the ventral cochlear nucleus (VCN) provide a rate representation of stimulus spectrum and a temporal representation of fundamental frequency (F0). This dual representation may be useful in segregating competing speech sounds, where differences in F0 are a cue. Responses to the vowel portion of concurrently presented pairs of syllables /bV∫/ with different F0's (88, 98, and 112 Hz) were studied in the VCN of anesthetized cats; 11 English vowels were used for V. Vowels were chosen so that one had a formant frequency just above the unit's best frequency (BF) and the other had a formant just below BF. By changing the stimulus sampling rate, formant peaks were shifted relative to the unit's BF, producing a range of stimuli, varying in the relative power of the two vowels within the unit's tuning curve. Results show that unit's discharge rates reflect the energy within their tuning curves and the relative synchronization of units' responses to the two F0's favors the dominant vowel. A method of segregating two vowels is provided in which relative synchronization to the F0's is used to apportion discharge rate between the vowels. Best results were obtained in chopper units, although primarylike units showed similar behavior.

AB - Chopper units of the ventral cochlear nucleus (VCN) provide a rate representation of stimulus spectrum and a temporal representation of fundamental frequency (F0). This dual representation may be useful in segregating competing speech sounds, where differences in F0 are a cue. Responses to the vowel portion of concurrently presented pairs of syllables /bV∫/ with different F0's (88, 98, and 112 Hz) were studied in the VCN of anesthetized cats; 11 English vowels were used for V. Vowels were chosen so that one had a formant frequency just above the unit's best frequency (BF) and the other had a formant just below BF. By changing the stimulus sampling rate, formant peaks were shifted relative to the unit's BF, producing a range of stimuli, varying in the relative power of the two vowels within the unit's tuning curve. Results show that unit's discharge rates reflect the energy within their tuning curves and the relative synchronization of units' responses to the two F0's favors the dominant vowel. A method of segregating two vowels is provided in which relative synchronization to the F0's is used to apportion discharge rate between the vowels. Best results were obtained in chopper units, although primarylike units showed similar behavior.

UR - http://www.scopus.com/inward/record.url?scp=0030796202&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030796202&partnerID=8YFLogxK

U2 - 10.1121/1.419859

DO - 10.1121/1.419859

M3 - Article

C2 - 9265754

AN - SCOPUS:0030796202

VL - 102

SP - 1056

EP - 1071

JO - Journal of the Acoustical Society of America

JF - Journal of the Acoustical Society of America

SN - 0001-4966

IS - 2

ER -