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Abstract
The marked suppression of noxious heat-evoked tail flick reflex was produced in conscious rats by low (2 Hz) or high (100 Hz) frequency electroacupuncture (EA) stimulation at acupoints S36 and Sp6. Electrolytic and kainate lesions in the ventral periaqueductal gray (vPAG) led to significant attenuation of the low and high frequency EA analgesia as measured 4 and 6 days following the lesion. In sham-operated animals, analgesia induced by either low or high frequency EA remained intact. The role of vPAG in organization of defferent EA analgesia is discussed in detail.