Long-term analgesic effects of inescapable shock and learned helplessness

Science  05 Oct 1979:
Vol. 206, Issue 4414, pp. 91-93
DOI: 10.1126/science.573496


Although exposure to inescapable shocks induced analgesia in rats, the analgesia was not manifest 24 hours later. A brief reexposure to shock, however, restored the analgesia. This reexposure to shock had an analgesic effect only if the rats had been shocked 24 hours previously. Further, long-term analgesic effects depended on the controllability of the original shocks and not on shock exposure per se. Implications of these results for learned helplessness and stress-induced analgesia are discussed.