聴覚誘発電位に対する純音および帯域雑音の影響 : 刺激音の周波数特異性を中心として

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The effects of the exposure to sound on auditory evoked potential (AEP) were studied. 1 kHz pure tone and band noise (center frequency ; 1 kHz, band width ; 0.7 octave) were exposed to six male subjects for thirty minutes continuously on different days. Test sound with short duration were presented at the cycle of once/1.5 sec before and after the exposure repetitively. Six kinds of pure tones (125, 250, 500, 1 k, 2 k, 4 kHz) and band noises (the same center frequency as pure tones with 0.7 octave band width) were adopted as the test sounds. AEP to test sound after the exposure to sound were compared to that before exposure. To investigate the specific effects on the kind of sound exposured, three kinds of conditions were combined to each test sound. The intensity of the sounds were 60 dB SL respectively. Results obtained were as follows : (1) When the subjects were exposed to 1 kHz pure tone, N_1 amplitude of AEP to 1 kHz pure tone tended to decrease just after exposure. It is supposed this effect recovers in a short time. (2) P_2 latency and amplitude of AEP were significantly increased just after exposure, but this effect is supposed to be independent on both exposure and test conditions. (3) N_1 amplitudes of AEP to pure tones were significantly larger than those to band noises, so it may be suggested that pure tone may induce more synchronous activity of relevant neuronal population. (4) The effects of center frequency of band noises on N_1 and P_2 components were similar to those of the frequency of pure tones. (5) Differential score after exposure were dependent on the initial level before exposure.
北海道大学の論文
1981-03-23

聴覚誘発電位に対する純音および帯域雑音の影響 : 刺激音の周波数特異性を中心として

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