Backonja M, Howland E W, Wang J, Smith J, Salinsky M, Cleeland C S
Neurology Department, University of Wisconsin, Madison 53792.
Electroencephalogr Clin Neurophysiol. 1991 Sep;79(3):192-203. doi: 10.1016/0013-4694(91)90137-s.
Phasic event-related desynchronization (ERD) of alpha activity briefly follows many types of stimulation. In order to define EEG changes resulting from longer stimulation. EEG records were made before and during hand immersion into cool and painfully cold water (cold pressor). Five minutes of 13-lead EEG records were obtained from 14 subjects for each condition. EEG frequency analysis was performed on artifact-free epochs from 60 to 240 sec following immersion. Following an initial phasic decrease in alpha power during cold water immersion, there was an augmentation of alpha power (8-12 Hz) in bilateral frontal and posterior electrodes. This augmentation was largely the result of an increase in the low alpha band (8-10 Hz). Alpha power at both central electrodes C3 and C4 changed little during cold water immersion. Cool water immersion produced less alpha power augmentation than cold water immersion. These observed changes were primarily in the high alpha band (10-12 Hz) and were larger in electrodes ipsilateral rather than contralateral to the stimulation. There was also an increase of beta bilaterally in frontal and posterior regions with cold water immersion. Our data demonstrate sustained topographic EEG responses during tonic stimulation from hand immersion in painfully cold water. These changes differ from those produced by stimulation with cool water immersion.
α活动的相位性事件相关去同步化（ERD）在多种类型的刺激后会短暂出现。为了确定长时间刺激所导致的脑电图（EEG）变化，在手部浸入冷水和极冷（冷加压）水之前及过程中进行了EEG记录。针对每种情况，从14名受试者获取了5分钟的13导联EEG记录。对浸入后60至240秒内无伪迹的时段进行了EEG频率分析。在冷水浸入过程中，α功率最初出现相位性下降之后，双侧额叶和后部电极处的α功率（8 - 12赫兹）增强。这种增强主要是低α频段（8 - 10赫兹）增加的结果。在冷水浸入过程中，中央电极C3和C4处的α功率变化不大。冷水浸入产生的α功率增强比极冷水浸入少。这些观察到的变化主要出现在高α频段（10 - 12赫兹），且在与刺激同侧而非对侧的电极中更大。冷水浸入时，额叶和后部区域双侧的β功率也增加。我们的数据表明，在手部浸入极冷水的持续性刺激过程中，EEG存在持续的地形图响应。这些变化与冷水浸入刺激所产生的变化不同。
