我们通过动物实验观察到刺激猫牙髓的大脑皮层诱发电位具有疼痛成分

并且可为电针穴位所抑制

这些结果有待在人体进行观察。针刺对人体大脑皮层诱发电中长潜伏期的晚期成分的影响已有报导

而对该诱发电中短潜伏期的早期成分

即反应特异性传导系统者

尚无观察分析资料。本工作试图探讨人体痛和非痛刺激所引起的The feature of evoked cerebral potential (ECP) by pain and non-pain stimulation was studied.The effect of electroacupuncture on each element of ECP was analysed

and their clinical significancediscussed. A series of experiments were carried out on 15 normal subjectswith non-pain stimulationand pain stimulation plus electroacupuncture. The following results have been obtained. (1) Non-pain ECP is a multiphasic complex wave which generally consists of P_1

N_1

P_2

P_3

4-5elements. As the confident limit is 95%

its lower limit ts 69.2% and upper limit is 100%. (2) Pain ECP is also a multiphasic complex which generally consists of P1

N1

P2

N2

P3

N3

P4

6-7 elements. As the confident limit is 95%

its lower limit is 55.5% and upper limit is 100%. (3) Comparing pain ECP with non-pain ECP

the latency of P_1-P_3 5 elements of pain ECP decre-ases (P<0.05)

its amplitude increases (P<0.05) and its wave form is still more complex. FollowingP_3 two new elements (N_3

P_3) appear. These two elements may be nonspecific indications of pain. (4) There is no significant change in the latency and amplitude of ECP by non-pain stimulatingthe little finger while electroneedling Hegu. No significant change in intensity and nature of nonpainsensation can be perceived by the stibjects. (5) Significant inhibitory effect of electro-acupuncture on the later elements ECP has been obser-ved (P<0.05 )

but there is no inhibitory effect on earlier elements-P_1

N_1 (P>0.1).