Department of Biomedical Engineering, Ming Chuan University, No. 5 Deming Road, Gweishan Township, Taoyuan 333, Taiwan.
Evid Based Complement Alternat Med. 2012;2012:951272. doi: 10.1155/2012/951272. Epub 2012 Sep 2.
Conventional laser stimulation at the acupoint can induce significant brain activation, and the activation is theoretically conveyed by the sensory afferents. Whether the insensible low-level Laser stimulation outside the acupoint could also evoke electroencephalographic (EEG) changes is not known. We designed a low-level laser array stimulator (6 pcs laser diode, wavelength 830 nm, output power 7 mW, and operation frequency 10 Hz) to deliver insensible laser stimulations to the palm. EEG activities before, during, and after the laser stimulation were collected. The amplitude powers of each EEG frequency band were analyzed. We found that the low-level laser stimulation was able to increase the power of alpha rhythms and theta waves, mainly in the posterior head regions. These effects lasted at least 15 minutes after cessation of the laser stimulation. The amplitude power of beta activities in the anterior head regions decreased after laser stimulation. We thought these EEG changes comparable to those in meditation.
常规的穴位激光刺激可引起显著的脑激活，这种激活理论上是通过感觉传入来传递的。那么穴位外的低水平不可感知激光刺激是否也能引起脑电图（EEG）的变化尚不清楚。我们设计了一种低水平激光阵列刺激器（6 个激光二极管，波长 830nm，输出功率 7mW，工作频率 10Hz），将不可感知的激光刺激传递到手掌。在激光刺激前后采集 EEG 活动，并分析每个 EEG 频段的幅度功率。我们发现，低水平激光刺激能够增加 alpha 节律和 theta 波的功率，主要在前头部区域。这些效应在激光刺激停止后至少持续 15 分钟。在前头部区域，beta 活动的幅度功率在激光刺激后降低。我们认为这些 EEG 变化与冥想时的变化相当。
