AUDIOLOGY JAPAN
Online ISSN : 1883-7301
Print ISSN : 0303-8106
ISSN-L : 0303-8106
Volume 40 , Issue 6
Showing 1-6 articles out of 6 articles from the selected issue
  • Haruka Nakahara, Tsunemasa Sato, Masaaki Yamane
    1997 Volume 40 Issue 6 Pages 701-707
    Published: December 31, 1997
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Fifteen cases of unilateral sensorineural hearing loss with severely declined speech discrimination scores, without CP angle tumors, were presented and discussed. Unlike so-called retrocochlear deafness with impaired speech intelligibility of both sides, these cases included both cochlear and retrocochlear findings according to the tests on recruitment phenomena and synthetic vowels.
    Many cases were diagnosed and treated as sudden deafness, but almost all cases showed the improvement of neither pure-tone sensitivity nor scores of speech discrimination tests. It was assumed that among cases of sudden deafness is there a group with poor prognosis, and that the speech discrimination score could be characteristic.
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  • Yasuhiro Manabe, Takehisa Saito, Tsutomu Sakashita, Hitoshi Saito
    1997 Volume 40 Issue 6 Pages 708-712
    Published: December 31, 1997
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Tinnitus loudness in 100 cases were measured before and after treatment and compared to self-reported changes in tinnitus loudness. Loudness matches were obtained both at the ipsilateral and contralateral ear with tinnitus. Self-reports of the change in tinnitus loudness were expressed by 10 scale method. Moderate correlations were found between self-reported change in tinnitus loudness and the loudness match values. However, when frequencies of tinnitus differed before and after treatment, these correlation were low. Therefore, attention not only to tinnitus loudness but also to changes in tinnitus pitch is necessary during treatment of tinnitus.
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  • Hiromi Naramura
    1997 Volume 40 Issue 6 Pages 713-718
    Published: December 31, 1997
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    In Japan, the population is aging rapidly and increasingly. In this situation, the establishment of a system of welfare service, social support for the elderly has become an urgent issue. To provide various kinds of services, communication is very important but most of the elderly have the agerelated hearing impairment.
    The difficult situations with the hearing impairment and the present status of hearing acuity were investigated by using the method developed by the Social Survey Division of the Office of Population Censuses (OPCS) that had been applied in a survery of disability in Great Britain. The questionnaire and pure tone audiometry were performed five hundred ninety-five people ranging from 65 years and over of age who stayed at a geriatric health service facility.
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  • Narihisa Tachihara, Hideki Okubo, Shigenori Satoh, Kazuhiko Takahashi, ...
    1997 Volume 40 Issue 6 Pages 719-723
    Published: December 31, 1997
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The present study was designed to determine whether the distortion product otoacoustic emissions (DPOAEs) are more sensitive to ototoxic changes than the compound action potential (CAP). Cisplatin (1.5mg/kg) was given daily to 10 albino guinea pigs until the amplitude of DPOAE was reduced by 5dB or more and CAP was measured at this point. Cumulative dose of cisplatin at the time of CAP measurement was 10.95±2.29mg/kg.
    Although DPOAEs were significantly reduced in amplitude from the pre-administration level, the CAP threshold was within normal limits in all animals.
    The results indicate that DPOAEs are able to detect ototoxicity induced by cisplatin at the earlier stage than CAP.
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  • Hiromi Tsuruoka, Tetsuro Arakawa, Sawako Masuda, Kotaro Ukai, Yasuo Sa ...
    1997 Volume 40 Issue 6 Pages 724-729
    Published: December 31, 1997
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Examination of speech discrimination of monosyllables and sentenses at speech-to-noise ratios between +5dB and +20dB under the multi talker bable was perpormed in patients with moderate sensorineural hearing loss. As the result, these patients required greater degree of speech-to-noise ratio (+15 to +20dB) than normal subjects. It was supposed that various factors, life experience, pattern recognition, intrest and conjecture are affected to understand the speech.
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  • Nobuyoshi Kawashima, Yuji Ase, Jun Kusakari
    1997 Volume 40 Issue 6 Pages 730-736
    Published: December 31, 1997
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Albino guinea pigs were stimulated simultaneously with two tones (F1, F2) of different frequency (f1=2000Hz, f2=2500Hz), and the phase of evoked DPOAEs (θDP) were 2θ1-2θ2+c, while θ1 and θ2 were the phase of F1 and F2 respectively (c: constant).
    When the wave F1 and F2 are expressed as a1cos(2πf1t1) and a2cos(2πf2t2) (a1, a2: amplitude of F1, F2), the third distorted wave at the frequency of 2f1-f2 is mathematically calculated as ka12a2cos{2π(2f1-f2)t-(2θ1-2θ2)} (k: constant, the rate of its distortion). Since this formula indicates that θDP is 2θ12, the results obtained suggested that the generation mechanism of DPOAE is not the simple vibration of the outer hair cells but the limited vibration related to the distorted wave of F1 and F2.
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