40Hz事象関連電位 (40Hz Event Related Potential: 40Hz ERP) のフィルタ及びパワースペクトル解析について
1984 年 27 巻 4 号 p. 300-309
詳細
1984 年 27 巻 4 号 p. 300-309
Changes of modality of 40Hz ERP (40Hz Event Related Potential) through various pass bands of input filter, and power spectra of 40Hz ERP during awake and asleep in adults were examined, and the following results were discussed.
1) 40Hz ERP is commonly recorded through 10-100Hz band pass filter as R. Galambos reported in 1981, but in these examinations its modality was seemed to be more stable when the pass band of input filter was 25-50Hz.
2) At the large intensity of stimuli the power spectra of 40Hz ERP had a peak of 40Hz component but when the intensity of stimuli was smaller for example 20dB and 0dB SL, 20Hz component had another peak and its power was relatively increased against the 40Hz component.
3) When the intensity of stimuli was 30dB SL, power of 20Hz or 15Hz component had another peak and that of 40Hz was decreased during asleep.
4) Considering these facts, it was thought that the more stable 40Hz ERP could be recorded using 25-50Hz band pass filter during not only awake but asleep even with small intensity of stimuli.
5) From the changes of modality of 40Hz ERP through various pass bands of filter and the power spectra of 40Hz ERP during awake and asleep, 40Hz ERP was thought to have a close relation not only to Po but also to Pa component of MLR (Middle Latency Response).
