目前已知脑啡肽与阿片受体常相伴存在,在尾壳核等脑区含量很高,本组巳报道尾壳核内的甲硫脑啡肽可能参与条件反射再现的调节。基于脑啡肽可能通过激活δ或μ受体而引起生理效应,而此两类阿片受体又都大量分布在尾壳核,故本研究进一步探讨了μ或δ受体在条件性行为调控中的作用. 实验用雌性Wistar大鼠,开始训练时体重80～120g。操作式条件反应箱由微机预设程序控制.在 It is known that enkephalin and opioid receptor are often associated with high content in the caudate putamen and other brain regions. It has been reported in this group that the methionine enkephalin in the caudate putamen may be involved in the regulation of conditioned reflex recurrence. Based on the fact that enkephalin may cause physiological effects by activating δ or μ receptors and both of these opioid receptors are abundantly distributed in the caudate putamen, the present study further explored the role of μ or δ receptors in the regulation of conditioned behavior The experimental female Wistar rats, starting training weight 80 ~ 120g. Operating condition of the reaction box controlled by the computer default program