A neuroelectric isopulse was a form of energy that could be used to restore nervous system functions.
The Borg assimilated a technology from Species 149 that allows the reanimation of individuals up to 72 hours after conventionally defined death, using neuroelectric isopulses to stimulate the subject's cerebral cortex. In 2374, Seven of Nine employed this technique to resuscitate Neelix after he was apparently killed in a protomatter accident. (VOY: "Mortal Coil")