2連パルス音検査の臨床的応用

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  • CLINICAL APPLICATION OF DOUBLE PULSE TONE TEST
  • 2レン パルスオン ケンサ ノ リンショウテキ オウヨウ

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A new method of hearing test using double pulses of variable interval (0-40 msec) was reported. The task of the subjects was to identify the given tone as double pulses. The results so far obtained were as follows;<br>1) Normal subjects were able to identify the double pulses with the interval of not less than 8-10 msec.<br>2) The ability of double pulse identification of the patients with conductive deafness was comparable to that of normal subjects, provided that the given tone was properly amplified.<br>3) The patterns of response of the patients with perceptive deafness were differed from those of normal and conductive deaf subjects. These patterns were classified into three types and called depressed, dispersed and impossible.<br>4) The patients with inner ear deafness showed the same response pattern as the normal subjects', while central deaf patients often showed the pattern of "impossible" type.<br>5) Most of congenital deaf patients showed the response pattern of either depressed or dispersed type, though this group was generally considered to have the deafness of inner ear origin.<br>The present result would suggest that in congenital deafness, the lack of postnatal auditory "training" plays an important role in identification of the double pulses.<br>6) It was considered from the foregoings that the ability of identifying the double pulses was closely related to the function of the central nervous system.

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