以往我们在摸索“经络感传”现象客观指标时曾以电脉冲刺激人体手、足、躯干及面部的个别腧穴而从被试者的头皮上记录平均诱发皮层电位。晚近早崎芳等做了刺激井、腧穴引起的体觉诱发电位的研究

但未报道面部腧穴刺激的诱发反应。本工作拟观察面部不同区域腧穴受有规律的电针刺激所诱发的皮层电位特征

以作为进一步探讨经络理论的基础。对象与方法被试者共43人(男26人、女17人)

年龄22～64岁

平均39.3岁

共中5人系The present work was performed on 43 adults

aged 22～64 years. Fine needles made of stainless steel with diameter of 0.32 mm and length of 15 mm were used as stimulating electrodes and recording electrodes as well. The averaged evoked somatosensory cortical potentials were recorded from the scalp as electric pulses of 0.2 ms in duration and about 4 times sensa- tion threshold in strength were delivered with a frequency of once per se- cond for 128～400 times to the acupuncture points on the face. The early components of evoked response recorded from the contralateral "face area" on the scalp following stimulation of the acupuncture point Dicang

Jiache

Sibai or Yangbai consisted of several waves arranged in a W-shaped fashion. These waves were called - P_(20) - N_(30) - P_(40) - P_(55) using the nomencla- ture based upon peak polarity and latency. No significant differences between the latencies of the evoked potentials induced by the aforementioned acu- puncture points stimulation were noticed (P>0.1). However

the amplitu- des of the potentials following stimulation of Dicang and Jiache appeared to be larger than those of Sibai and Yangbai (P<0.025). The responses evoked by stimulating Renzhong were fundamentally similar to those by the Dicang stimulation in waveform except that 3 positive waves occurring in the early components in one case. In contrast to the Dicang

Jiache

Sibai or Yangbai stimulation which evoked responses on contralateral "face area" predominantly

the Renzhong stimulation evoked responses bilaterally on the scalp. As the evoked response from Dicang stimulation was compared with that from prior non-acupuncture stimulation

the N 30 peak latency of the former was 1.49 ms longer than that of the latter (P<0.025). No other significant differences between them were found