Difference Limen Testに就て

概要

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Recently, the Difference Limen Test(D.L.T.) has been used as a routine method for hearing test, but standard values have not yet been established.The authors have tried to determine the range of normal values for this test.The observations were carried out using three standard audiometers with sine wave(3c/s).The Difference Limen(D.L.) and Difference Limen Difference (D.L.D.) in persons with normal hearing have been estimated using 10, 20 and 40db intensity of each frequency.Mean values calculated at next freauencv are as follows:Then D.L, and D.L.D.were determined in patients with known deafness at two intensities which were 10, 20 or 40db above the threshold of hearing, in each frequency.These results were compared with the normal values.If the results in patients with deafness are smaller than the standards, the test is considered positive and if they are larger it is considered as being negative.A positive value for this test suggests that recruitment phenomenon in the deafened ear is present.
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