Analgesia from Electrical Stimulation in the Brainstem of the Rat

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Science  24 Dec 1971:
Vol. 174, Issue 4016, pp. 1351-1354
DOI: 10.1126/science.174.4016.1351


Stimulation at several mesencephalic and diencephalic sites abolished responsiveness to intense pain in rats while leaving responsiveness to other sensory modes relatively unaffected. The peripheral field of analgesia was usually restricted to one-half or to one quadrant of the body, and painful stimuli applied outside this field elicited a normal reaction. Analgesia outlasted stimulation by up to 5 minutes. Most electrode placements that produced analgesia also supported self-stimulation.One placement supported self-stimulation only in the presence of pain.

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