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Journal of Speech and Hearing Research Vol.28 445-448 September 1985.
© American Speech-Language-Hearing Association
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Diotic Loudness Summation in Normal and Impaired Hearing

Joseph W. Hall 1
Antony D.G. Harvey 2
1 Northwestern University, Chicago, IL
2 MRC Institute of Hearing Research, University of Nottingham, Nottingham, U.K.

Diotic loudness summation at 500 and 2000 Hz was measured in 10 normal-hearing and 10 cochlear-impaired listeners. Diotic stimuli were matched in loudness to monaural "standards" of 70, 80, and 90 dB SPL. Diotic loudness summation averaged about 9 dB at 500 Hz for both groups. At 2000 Hz, the hearing-impaired listeners showed reduced diotic loudness summation at the 70- and 80-dB levels, but showed normal diotic loudness summation (about 9 dB) at the 90-dB level. The results indicate that diotic loudness summation is normal in cochlear-impaired ears, provided that the stimuli are presented sufficiently above threshold.

Submitted on October 22, 1984
Accepted on May 13, 1985






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