音刺激による後耳介反応の研究

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  • THE CLICK-EVOKED POSTAURICULAR RESPONSE AND ITS CLINICAL APPLICATION
  • オトシゲキ ニヨル ゴ ジカイ ハンノウ ノ ケンキュウ

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The human averaged evoked responses to clicks elicited from the postauricular region were sudied in order to evaluate its clinical use. Subjects were 31 awake adults with normal hearing. They were seated on a chair in a soundproof room. Active electrode was attached to the region just behind the auricle, while reference and ground electrodes were placed on one of the ear lobes and the root of the nose respectively. The responses were amplified and averaged by a medical computer, whose analysis me was set at 50 cosec. 500 signals were averaged in a test run and were recorded by an X-Y recorder. Click stimuli were given through a loudspeaker at intervals of 125 msec. The followings are the results obtained :<br>1) The response consisted of a negative wave (N) followed by a positive wave (P). Their peak latencies ranged 12-19 msec (N) and 18-25 msec (P). The mean N-peak latency at 70 dB SL was 15 msec. The N-P amplitude was highly variable in both intra- and inter-subject.<br>2)The positive responses were observed in 20.3, 72.2 % and in 84.0 % at the intensity levels of 10, 40 and 70 dB SL conditions respectively.<br>3)The distribution of response threshold was as follows : 51.6 % was under 30 dB SL, 25.8 % was 40-60 dB SL and 22.6 % was above 70 dB SL.<br>4)The intra subject threshold difference was less than 30 dB.<br>5)The response was dominantly elicited from a small area of about 1 x 2 cm behind the auricula.<br>6)The amplitude of the response was about 1.2 to 2.5 times larger in the head down position than in the natural upright position.<br>7)On the basis of these results, this response can be applied in clinical practice, although "response negative" does not necessarily mean the loss of hearing.

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