Objective:The pain experience includes sensory-discrimination as well as emotional-affective dimensions. A number of tests and studies have showed that, electroacupuncture can relieve the sensory-discrimination aspect of pain, which is through activating the opioid receptors in the ACC to play the role of pain relief. Clinical studies and animal experiments have showed that electroacupuncture treatment can alleviate the emotional-affective aspect of pain in human and animal, but the mechanism is unknown cle...