刺激手三阴经不同经穴大脑皮层体感诱发电位早成分地形图的时-空特征观察

Topographic Observation on Spatiotemporal Character of SEP Early Components when Stimulation Different Acupoints

本研究采用美国NEUROSCAN公司生产的128－ESI系统对刺激手三阴经不同经穴大脑皮层体感诱发电位（SEP）N20成分及其后约20毫秒内的SEP脑地形图进行观察，结果表明，刺激穴位后SEP皮层早成分在皮层的分布范围，不仅局限于刺激部位对侧的大脑皮层中央的体感区，而是能够扩及到皮层的许多部分，并且有一个动态的衍变过程。表明人类大脑对接受刺激经穴的信息有相当复杂的机制。对刺激不同的穴区得到的SEP皮层早成分地形图进行观察，发现大脑皮层的兴奋区时序变化都有一个大体近似的过程，额区、中央、颞、枕等区都参与了针刺信息的感知过程，为进一步揭示针刺作用机理提供了线索。

A topographic observation using 128 channal electric signal imaging system on early components(N20 and following 20ms) of sensory evoked potential (SEP) was carried out on ten subjects after stimulating acupoints of the Three-Yin Meridians of the Hand. Results showed when acupoint was stimulated, high voltage areas were ohserved not only in S I area but also in other regions of the cere-bral cortex, having a dynamic changlng process, this indicates there is a complicated cortical mechanism in percepting information of acupuncture. Comparing the opographic maps of SEP induced by acupuncture at different acupoints, a general similar spatiotemporal changing process of electric activity could be found and several cortical reglons, such as frontal, central, occipital and post-temporal are in-volved. All of these results .provide a new clue for us to find out the mechanism of acupunture.