騒音のレベル変化量が聴覚誘発緩反応に与える影響

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The effects of the level increase from background level on N_1-P_2 amplitude and on latencies are studied using trapezoidal white noise whose rising speed is expressed in dL/dt. The results show that N_1-P_2 amplitude increases with an increase of ⊿ L up to 10dB and does not increase with the increase of ⊿ L above 10dB, when rising speed is fixed at 500dB/s. That is, N_1-P_2 amplitude is not affected by the additional level increase after 20 ms from the onset in the case of rising speed of 500dB/s. N_1-P_2 amplitude is a little greater when the background level is 70dBA than when it is 30dBA. As for latencies, T_<N1> and T_<P2> are constant when ⊿ L is greater than 6 dB, while they are longer for less ⊿ L. latencies are a little shorter when the background level is 70dBA than when it is 30dBA. On the other hand, when rising speed is fixed at 2000dB/s. N_1-P_2 amplitude increases with an increase of ⊿ L up to 20dB and does not change with the increase of ⊿ L above 20dB. That is to say, N_1-P_2 amplitude is not affected by the additional level increase beyond 10ms from the onset in the case of rising speed of 2000dB/s. An increase of ⊿ L has no influence on T_<P2> with ⊿ L greater than 10dB and T_<N1> decreases a little with an increase of ⊿ L. N_1-P_2 amplitude of 2000dB/s is a little greater than that of 500 dB/s with ⊿ L above 8dB and the amplitude for the both rising speeds show no difference with ⊿ L up to 9dB. T_<N1> and T_<P2> of 2000dB/s area little shorter than those of 500dB/s with ⊿ L greater than 8dB, though there is no difference between the latencies of 2000dB/s and those of 500dB/s with ⊿ L smaller than 8 dB.
社団法人日本音響学会の論文
1982-02-01

騒音のレベル変化量が聴覚誘発緩反応に与える影響

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