音響刺戟により,覚醒時家兎に見ちれた大脳誘発電位と,その聴力測定への応用
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概要
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From the point of which the evoked potential was found to happen in the waking rabbit brain by acoustic stimulus, the measurement of hearing was given its application a trial and the mini-mum reaction value (threshold) was examined quantitively.The observation for the evoked potential was carried out using the automatic superimposition technique to wich photo-transistor was applied.The curve of the minimum reaction value to the acoustic stimulus ranged from the 250 to 8000 cps, with the interval of 10 seconds and 0.5 second stimulating time was shown by audiogram. The average value of each cycle obtained was between 50 to 60db.Through a short and long continuous observation the change of threshold was revealed to be approximately within the extent of±1Cdb.In the case of water or mercury being instilled in to the external auditory canal, the change of threshold was increased to 50db or more respectively in comparison with the condition before loading.The change of reaction threshold was observed using 1, 000cps tone to mask 3, 000cps tone. The result obtained was that the reaction threshold of the masked tone elevated at 80db generally, and the difference of 10 to 20db was seen in comparison with human case.From these results obtained, conclusion was drawn that the above evoked potential would be an index of the measurement of hearing to the rabbit and especially in the long period observa-tion, would be one of the most effective methods.
- 社団法人 日本耳鼻咽喉科学会の論文