Fanselow M S
Behav Neurosci. 1985 Jun;99(3):589-92. doi: 10.1037//0735-7044.99.3.589.
When unstressed rats were placed in a chamber containing the odor of a conspecific that had received electric shock, they became analgesic as assessed by the formalin test. The odors of nonstressed conspecifics and novel odors produced no such effect. This analgesia was reversed by naltrexone. The data suggest that naturalistic stimuli innately associated with aversive environmental events can activate endogenous pain control mechanisms.
当将未受应激的大鼠置于含有曾遭受电击的同种个体气味的实验箱中时，通过福尔马林试验评估发现它们产生了镇痛作用。未受应激的同种个体的气味以及新的气味则不会产生这种效果。这种镇痛作用可被纳曲酮逆转。这些数据表明，与厌恶环境事件天生相关的自然主义刺激能够激活内源性疼痛控制机制。
