両耳聴における音像移動弁別閾値に関する研究

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In recent years, it has become apparent that the directional hearing capacity in binaural hearing correlates with the perceptive hearing disorders.From such a medical significance, the experiment was carried out in order to research the possibility of clinical application of the differential diagnosis of hearing impairment causing central auditory pathway.The experiment was performed with the use of the interaural time difference generator fitted with a sound generator, two movable microphones, two attenuators and earphones.Normal hearing subjects, equipped with earphones, listened acoustic stimuli composing of variable interaural time and intensity differences and discriminate the difference of the position of the two sound impressions which exist in the listeners head or in its close proximity. The interaural time difference can be expressed in the distance between the two microphones in this apparatus.The better discrimination orders of localization of a sound impression are noise, voice bubble and pure tone.In view of the band noise, sound impression consisting 600_??_850cps can be localized most easily.In respect of discrimination of angular localization for a pure tone, the interaural time difference is not so effective than for the other kinds of sound i.e. voice bubble and noise.The function of the angular direction is the best at median plane.The value of the discrimination of sound impressions is generally smaller in lateral side of median plane and it is difficult to discriminate two sound impressions deviated over the angle of 45_??_60°by intensity or time difference alone.The difference of hearing loss between two ears to enable angular direction of two sound im.uression is annroximatply lass than 3dB.
社団法人日本耳鼻咽喉科学会の論文

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寺尾彬
東京大学医学部耳鼻咽喉科教室

両耳聴における音像移動弁別閾値に関する研究

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