電子計算器による人の脳波聴性反応に関する研究

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概要

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• There are a variety of methods of objective audiometry, among which is a test based on EEG response to sound. In connection with the EEG auditory response, a method has recently been used widely in which EEG response induced by sound stimulus is added by means of electronic computer.Therefore, we have studied in the 56 subjects the relationship between the response of scalprecorded EEG and the duration, interval, frequency, and intensity of sound stimuli as well as the state of consciousness, in order to find out the most appropriate conditions for the EEG audiometry by the use of an electronic computer.All subjects were selected from among adults of more than 15 years of age. The EEG was made by monopolar recording from vertex, and auditory response at the awakening was recorded without medication prior to test. An electronic computer used in the experiments is CAT 400B.The results are as follows:1. The analysis of the summated auditory response revealed 4 different types of waves: positive wave (P1), negative wave (N1), positive wave (P2) and negative wave (N2) with a peak latency of approx. 75, 130, 220 and 360msec., respectively. But P1 and N2 may be absent at times.2. The optimal interval of sound stimuli is 1 sec.3. The duration of sound stimuli most preferably is 100msec. with a rise and fall time of 10msec.4. The auditory evoked potential in EEG is least with a frequency of 4Kcps among the different frequencies employed: 0.5, 1, 2 and 4Kcps.5. The auditory evoked potential in EEG becomes greater as the intensity of sound increases. But, once the latter attained a certain limit no great increase in the former was noticeable on further increasing the latter in many instances.6. During the test the examiner should always make the subject concentrate his attention on sound stimuli. In case the test is prolonged, it is also necessary for the examiner to change the mode of stimulation adequately so as to avoid attenuation of the response due to habituation.7. The test is one of the most excellent objective audiometry from the viewpoint that the response appears consistently near the subjective auditory threshold and the evaluation of result is easier among the other objective audiometric methods.8. Besides, the test will help to make the differential diagnosis of impaired hearing, if performed under reasonable conditions.

• 社団法人 日本耳鼻咽喉科学会の論文

著者

• 伊藤 治夫

  京都府立医科大学耳鼻咽喉科学教室言語聴覚相談室

• 伊藤 治夫

  京都府立医科大学耳鼻咽喉科学教室

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