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pp.9-11
Published Date 1957/1/20
DOI https://doi.org/10.11477/mf.1492201710

Ohwada and associates made attempts to de-termine the amount of fluctuation that may occur in threshold hearing by bone conduction in a normal hearing person when tested in se-ries of different days. They found that, within the range of 250 to 4,000 cps, that amount was the maximum of 15 db and the figure appeared to be in agreement with such fluctuations that may occur in threshold hearing by air condu-ction and similar mode of testing.

Furthermore, the question on deviation that may be found in the threshold hearing by bone conduction in normal persons is discussed; the two types of thresholds, bone and air condu-ctions are compared to each other. As a result it is found that the bone conduction exceed that of the air by 60 db. Consequently, the au-thors state that, threshold testing becoms a difficulty when air conduction hearing shows a loss which may bebeyond 60 db and the he-aring by bone conduction beingthe better of the two.


Copyright © 1957, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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