Effect of Electroconvulsive Shock on an Extinguished "Fear" Response

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Science  07 Apr 1961:
Vol. 133, Issue 3458, pp. 1080-1081
DOI: 10.1126/science.133.3458.1080


To test Gellhorn's hypothesis that electroconvulsive shock reinstates extinguished responses, a conditioned "anxiety" response was established and then extinguished in rats. A series of treatments did not restore the extinguished "anxiety" response; in fact, control animals showed appreciable spontaneous recovery of the "anxiety" response while treated animals did not.