| Neural encoding and perception of speech signals in informational masking. | |
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MedLine Citation:
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PMID: 22367094 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Keri O'Connell Bennett; Curtis J Billings; Michelle R Molis; Marjorie R Leek |
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Publication Detail:
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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:
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Title: Ear and hearing Volume: 33 ISSN: 1538-4667 ISO Abbreviation: Ear Hear Publication Date: 2012 Mar-Apr |
Date Detail:
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Created Date: 2012-02-27 Completed Date: 2012-06-26 Revised Date: 2013-04-15 |
Medline Journal Info:
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Nlm Unique ID: 8005585 Medline TA: Ear Hear Country: United States |
Other Details:
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Languages: eng Pagination: 231-8 Citation Subset: IM |
Affiliation:
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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 |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation
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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:
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R01 DC 00626/DC/NIDCD NIH HHS; R01 DC000626/DC/NIDCD NIH HHS; R01 DC000626-25/DC/NIDCD NIH HHS |
| Comments/Corrections | |
Erratum In:
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Ear Hear. 2012 May;33(3):436 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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