| Detection of temporal gaps in sinusoids by normally hearing and hearing-impaired subjects. | |
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MedLine Citation:
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PMID: 2708669 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A two-alternative forced-choice task was used to measure psychometric functions for the detection of temporal gaps in a 1-kHz, 400-ms sinusoidal signal. The signal always started and finished at a positive-going zero crossing, and the gap duration was varied from 0.5 to 6.0 ms in 0.5-ms steps. The signal level was 80 dB SPL, and a spectrally shaped noise was used to mask splatter associated with the abrupt onset and offset of the signal. Two subjects with normal hearing, two subjects with unilateral cochlear hearing loss, and two subjects with bilateral cochlear hearing loss were tested. The impaired ears had confirmed reductions in frequency selectivity at 1 kHz. For the normal ears, the psychometric functions were nonmonotonic, showing minima for gap durations corresponding to integer multiples of the signal period (n ms, where n is a positive integer) and maxima for durations corresponding to (n - 0.5) ms. For the impaired ears, the psychometric functions showed only small (nonsignificant) nonmonotonicities. Performance overall was slightly worse for the impaired than for the normal ears. The main features of the results could be accounted for using a model consisting of a bandpass filter (the auditory filter), a square-law device, and a sliding temporal integrator. Consistent with the data, the model demonstrates that, although a broader auditory filter has a faster transient response, this does not necessarily lead to improved performance in a gap detection task. The model also indicates that gap thresholds do not provide a direct measure of temporal resolution, since they depend at least partly on intensity resolution. |
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Authors:
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B C Moore; B R Glasberg; E Donaldson; T McPherson; C J Plack |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 85 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 1989 Mar |
Date Detail:
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Created Date: 1989-05-26 Completed Date: 1989-05-26 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1266-75 Citation Subset: IM |
Affiliation:
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Department of Experimental Psychology, University of Cambridge, England. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Attention / physiology* Auditory Threshold / physiology* Cochlear Nerve / physiopathology Hearing Loss, Sensorineural / physiopathology* Humans Meniere Disease / physiopathology* Middle Aged Neurons / physiology Pitch Discrimination / physiology* Presbycusis / physiopathology Psychoacoustics Time Perception / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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