The experipments were performed in anaesthetized rats.The responses of convergent neurons inspinal dorsal horn to noxious stimuli(10mA

2ms)given at the hindpaw receptive field were recordedextracellularly by glass microelectrodes.The effeets of EA on the nociceptive response were observed.EA was applied on ipsilateral“Zusanli”or“Xiaguan”point with high and low intensity.EA(18V

100Hz)applied on ipsilateral either“Zusanli”or“Xiaguan”could produce strong inhi-bition on nociceptive responses of convergent neurones(62.74±4.94% and 64.24±7.30%).EA(2V

100Hz)of“Zusanli”also obviously inhibited the noeiceptive responses(52.05±6.69%).Butthe same EA of“Xiaguan”lacked this inhibitory effect(9.50±7.67%).There was statistically sig-nificant difference between EA effects of“Zusanli”and“Xiaguan”(P<0.001)when intensity of EAis lower.These results guggested that analgesia of high intensity EA is extensive

but that of low intensityEA is produced only when the point is in the same or nearby spinal segment with nociceptive field

showing the extensiveness and specificity of EA analgesia of different points.