音の聴えの方向感に関する研究-2-
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概要
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The sound lateralization test in dichotic way is considered to be useful to detect the central lesion from a group of perceptive deafness.Analysis of the central binaural interaction by the following two methods, i.e. centering technique and matching technique, is reported in this paper.In the centering technique, subject is asked to offset an interaural difference in time by a difference of intensity in opposite direction, or vice versa.In the matching technique, the subject is asked to match the lateral position of a sound image pro-duced by interaural intensity difference by means of the other image yielded by interaural time diff-erence. Each pair of tones was presented alterna-tely.Time vs. intensity trade was linear in the ma-tching technique, but it was non-linear in the cent-ering technique.In each band noise such as 300_??_425cps, 600_??_850cps, 1, 200_??_1, 700cps, time vs. intensity ratio in the centering technique was always smaller than that in the matching technique.Among the time vs. intensity ratios, the value of 600_??_850cps band noise was the largest in both centering and matching technique.From the difference between two graphs obta-ined by the two methods, the inhibitory mechanismat the brain stem in physiology of sound lateraliza.tion was suggested.It is well known that the sound localisation is attributed to the interaural time difference and that the time judgement process is carried out in the superior olivary complex. Basing on this concept, the possibility of clinical use of the sound laterali-zation test (just noticeable difference in time and time vs. intensity trade) is mentioned.
- 社団法人 日本耳鼻咽喉科学会の論文