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Journal of Speech and Hearing Research Vol.27 145-154 March 1984.
© American Speech-Language-Hearing Association
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Factors Influencing the Masking Level Difference in Cochlear Hearing-Impaired and Normal-Hearing Listeners

Joseph W. Hall 1
Richard S. Tyler 2

Mariano A. Fernandes 1
1 MRC Institute of Hearing Research, University of Nottingham, UK
2 University of Iowa Hospitals and Clinics, Iowa City

The masking level difference (MLD) at 500 Hz was examined in wide-band (960 Hz) and narrow-band (50 Hz) noise for normal-hearing subjects and subjects with symmetrical mild-to-moderate cochlear hearing loss. Monaural tasks of intensity discrimination, temporal resolution, and frequency resolution were performed in order to examine relationships between monaural dysfunction and MLD performance. Interaural time discrimination for a 500-Hz pure tone also was examined. The performance of the hearing-impaired subjects was poorer than that of the normal-hearing subjects for MLD, interaural Dgrt, and most monaural tasks. However, no significant relationships were found between monaural and MLD performance when effects of threshold were taken into account. MLDs were more reduced in wide-band noise than in narrow-band noise for the hearing-impaired subjects (when Contrasted with normal-hearing subjects). MLD performance was correlated with interaural time discrimination, and it is suggested that one reason for poor MLD performance with hearing impairment may be poor temporal coding of stimulus-fine structure.

Submitted on November 4, 1982
Accepted on August 3, 1983


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