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U.S.A."],"published-print":{"date-parts":[[2017,5,16]]},"abstract":"<jats:title>Significance<\/jats:title>\n                  <jats:p>Understanding the physiology of noninvasive brain stimulation requires precise knowledge of biophysical properties of brain tissue (e.g., conductivities). Numerous researchers have tried to measure these properties using in vitro, in vivo, and ex vivo preparations in nonhuman animals or human tissue, though findings have tended to vary across studies. We measured electric fields in the nonhuman primate brain during transcranial electric stimulation both in vivo and ex vivo. We found large changes in electric fields between in vivo and ex vivo measurements that increased with postmortem time, along with a significant effect of body temperature on electric field strength. 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