Document Detail


Neural encoding and perception of speech signals in informational masking.
MedLine Citation:
PMID:  22367094     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To investigate the contributions of energetic and informational masking to neural encoding and perception in noise, using oddball discrimination and sentence recognition tasks.
DESIGN: P3 auditory evoked potential, behavioral discrimination, and sentence recognition data were recorded in response to speech and tonal signals presented to nine normal-hearing adults. Stimuli were presented at a signal to noise ratio of -3 dB in four background conditions: quiet, continuous noise, intermittent noise, and four-talker babble.
RESULTS: Responses to tonal signals were not significantly different for the three maskers. However, responses to speech signals in the four-talker babble resulted in longer P3 latencies, smaller P3 amplitudes, poorer discrimination accuracy, and longer reaction times than in any of the other conditions. Results also demonstrate significant correlations between physiological and behavioral data. As latency of the P3 increased, reaction times also increased and sentence recognition scores decreased.
CONCLUSION: The data confirm a differential effect of masker type on the P3 and behavioral responses and present evidence of interference by an informational masker to speech understanding at the level of the cortex. Results also validate the use of the P3 as a useful measure to demonstrate physiological correlates of informational masking.
Authors:
Keri O'Connell Bennett; Curtis J Billings; Michelle R Molis; Marjorie R Leek
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Ear and hearing     Volume:  33     ISSN:  1538-4667     ISO Abbreviation:  Ear Hear     Publication Date:    2012 Mar-Apr
Date Detail:
Created Date:  2012-02-27     Completed Date:  2012-06-26     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  8005585     Medline TA:  Ear Hear     Country:  United States    
Other Details:
Languages:  eng     Pagination:  231-8     Citation Subset:  IM    
Affiliation:
National Center for Rehabilitative Auditory Research, Portland Veterans Affairs Medical Center, Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon OR 97239 , USA. keri.oconnell2@va.gov
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation / methods
Adult
Discrimination (Psychology) / physiology
Event-Related Potentials, P300 / physiology
Evoked Potentials, Auditory*
Female
Humans
Male
Noise
Pattern Recognition, Physiological / physiology
Perceptual Masking / physiology*
Phonetics*
Psychomotor Performance
Reaction Time / physiology
Signal-To-Noise Ratio
Speech Perception / physiology*
Young Adult
Grant Support
ID/Acronym/Agency:
R01 DC 00626/DC/NIDCD NIH HHS; R01 DC000626/DC/NIDCD NIH HHS; R01 DC000626-25/DC/NIDCD NIH HHS
Comments/Corrections
Erratum In:
Ear Hear. 2012 May;33(3):436

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


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