Document Detail


Cortical evoked response to acoustic change within a syllable.
MedLine Citation:
PMID:  9728724     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To investigate whether the evoked potential to a complex naturally produced speech syllable could be decomposed to reflect the contributions of the acoustic events contained in the constituent phonemes. DESIGN: Auditory cortical evoked potentials N1 and P2 were obtained in eight adults with normal hearing. Three naturally produced speech stimuli were used: 1) the syllable [sei]; 2) the sibilant [s], extracted from the syllable; 3) the vowel [ei] extracted from the syllable. The isolated sibilant and vowel preserved the same time relationships to the sampling window as they did in the complete syllable. Evoked potentials were collected at Fz, Cz, Pz, A1, and A2, referenced to the nose. RESULTS: In the group mean waveforms, clear responses were observed to both the sibilant and the isolated vowel. Although the response to the [s] was weaker than that to [ei], both had N1 and P2 components with latencies, in relation to sound onset, appropriate to cortical onset potentials. The vowel onset response was preserved in the response to the complete syllable, though with reduced amplitude. This pattern was observable in six of the eight waveforms from individual subjects. CONCLUSIONS: It seems likely that the response to [ei] within the complete syllable reflects changes of cortical activation caused by amplitude or spectral change at the transition from consonant to vowel. The change from aperiodic to periodic stimulation may also produce changes in cortical activation that contribute to the observed response. Whatever the mechanism, the important conclusion is that the auditory cortical evoked potential to complex, time-varying speech waveforms can reflect features of the underlying acoustic patterns. Such potentials may have value in the evaluation of speech perception capacity in young hearing-impaired children.
Authors:
J M Ostroff; B A Martin; A Boothroyd
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Ear and hearing     Volume:  19     ISSN:  0196-0202     ISO Abbreviation:  Ear Hear     Publication Date:  1998 Aug 
Date Detail:
Created Date:  1998-12-23     Completed Date:  1998-12-23     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8005585     Medline TA:  Ear Hear     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  290-7     Citation Subset:  IM    
Affiliation:
Program in Speech and Hearing Sciences, Graduate Center, City University of New York, New York 10036, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Evoked Potentials, Auditory, Brain Stem*
Female
Humans
Male
Middle Aged
Phonetics
Speech Acoustics
Speech Perception / physiology*
Time Factors
Grant Support
ID/Acronym/Agency:
5P50DC00178/DC/NIDCD NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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