| On the number of auditory filter outputs needed to understand speech: further evidence for auditory channel independence. | |
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MedLine Citation:
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PMID: 19539016 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The number of auditory filter outputs required to identify phonemes was estimated in two experiments. Stimuli were divided into 30 contiguous equivalent rectangular bandwidths (ERB(N)) spanning 80-7563Hz. Normal-hearing listeners were presented with limited numbers of bands having frequency locations determined randomly from trial to trial to provide a general view, i.e., irrespective of specific band location, of the number of 1-ERB(N)-wide speech bands needed to identify phonemes. The first experiment demonstrated that 20 such bands are required to accurately identify vowels, and 16 are required to identify consonants. In the second experiment, speech-shaped noise or time-reversed speech was introduced to the non-speech bands at various signal-to-noise ratios. Considerably elevated noise levels were necessary to substantially affect phoneme recognition, confirming a high degree of channel independence in the auditory system. The independence observed between auditory filter outputs supports current views of speech recognition in noise in which listeners extract and combine pieces of information randomly distributed both in time and frequency. These findings also suggest that the ability to partition incoming sounds into a large number of narrow bands, an ability often lost in cases of hearing impairment or cochlear implantation, is critical for speech recognition in noise. |
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Authors:
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Frédéric Apoux; Eric W Healy |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2009-06-16 |
Journal Detail:
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Title: Hearing research Volume: 255 ISSN: 1878-5891 ISO Abbreviation: Hear. Res. Publication Date: 2009 Sep |
Date Detail:
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Created Date: 2009-08-03 Completed Date: 2009-11-04 Revised Date: 2010-12-17 |
Medline Journal Info:
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Nlm Unique ID: 7900445 Medline TA: Hear Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 99-108 Citation Subset: IM |
Affiliation:
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Department of Speech and Hearing Science, The Ohio State University, Columbus, OH 43210, USA. fred.apoux@gmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Auditory Pathways / physiology* Humans Noise Phonetics Psychoacoustics Speech Discrimination Tests Speech Perception / physiology* Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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DC008594/DC/NIDCD NIH HHS; DC009892/DC/NIDCD NIH HHS; R01 DC008594-01A1/DC/NIDCD NIH HHS; R03 DC009892-01/DC/NIDCD NIH HHS; R03 DC009892-03/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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