聴性電気反応の中間成分に関する研究-2-波形に及ぼすフィルタの影響について

概要

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The influence of the two band pass filters (2-200Hz, 25-200Hz) on the middle components of the averaged auditory evoked potentials was analyzed. The subjects were 6 children under 2 years old, 6 children 3 to 4 years old, 6 between 5 to 7 years old, and 6 adults. All of them were proved to have normal hearing. Tone pips of 1000Hz were presented at 20, 40 and 60dB above the mean subjective thresholds of normal adults. The filter with the passband of 25-200 Hz decreased the amplitude and the detectability of Po and increased those of Pa. Na was little influenced by either filters. However, Nai of elder subjects became more prominent than Nat by using the filter of 25-200Hz. At present, the most suitable index of the objective audiometry in infants is Po-Na, and for detecting these components, a filter with low cut off frequency over 20Hz is not recommended.
一般社団法人日本耳鼻咽喉科学会の論文