聴覚誘発脳波(緩反応)に及ぼす騒音の立上り速度の影響
1981 年 37 巻 2 号 p. 55-64
詳細
1981 年 37 巻 2 号 p. 55-64
In this study the rising speed (dL/dt ; dB/s) is employed to express the initial stage of auditory stimuli. It is a changing rate of sound pressure level at the onsent. In experiment I, Trapezoidal white noises with a fixed peak duration are presented at various rising speeds and at various peak levels. The results show that the N_1-P_2 amplitude increases with an increase of rising speed and is invariable in the change of peak level. Each peak latency decreases with an increase of rising speed and is invariable in the change of peak level. In experiment II, constant rising speeds (100, 200, 500 dB/s), an accelerated rising speed (100-200-500 dB/s), and a decelerated rising speed (500-200-100 dB/s) are used. In the case of 500-200-100 dB/s, the response is similar to that of 500 dB/s, but in the case of 100-200-500 dB/s, the response is different from that of 100dB/s and waves complicatedly. From the result of experiment I, the threshold of the response on rising speed is estimated to be about 75dB/s.
