Pfurtscheller G
EEG EMG Z Elektroenzephalogr Elektromyogr Verwandte Geb. 1977 Sep;8(3):145-54.
EEG data were recorded in 13 students during one-second light-stimulation with eyes closed and sometimes eyes opened, from central and occipital regions. The background EEG was computer-analyzed in the alpha-band using the power time course where a short decrease in power was indicative of a phasic desynchronization of the rhythmic activity within the alpha-band. The maximal desynchronization was observed in the occipital region independent of eyes-opened or eyes-closed conditions. With eyes closed a reinforced power decrease was found 0.25-0.5 sec after the on- and offset of light-stimulation, which was interpreted as "on"- and "off"- effect of the background EEG activity. Parallel with the on- and off-effect a slow potential change occurred in the evoked responses. The behaviour of the background activity during 1 sec light-stimulation was intramodality specific in contrast to the evoked response which showed an intramodality unspecific behaviour with maximal amplitude in the central region.
在13名学生闭眼及有时睁眼状态下，对其进行1秒钟的光刺激，同时从中央和枕叶区域记录脑电图（EEG）数据。使用功率时间进程对α波段的背景脑电图进行计算机分析，其中功率的短暂下降表明α波段内节律性活动的相位去同步化。无论睁眼或闭眼状态，枕叶区域均观察到最大去同步化。闭眼时，在光刺激开启和关闭后0.25 - 0.5秒发现功率增强性下降，这被解释为背景脑电图活动的“开启”和“关闭”效应。与开启和关闭效应并行，诱发反应中出现缓慢的电位变化。与诱发反应在中央区域具有最大振幅且呈现模态内非特异性行为不同，1秒钟光刺激期间背景活动的行为是模态内特异性的。
