Death might not be a clear-cut event, as gamma brainwaves may persist even after other signs of life have ceased. Doctors told his family he had no reflexes or brain activity. “We think of a comatose person as ‘gone,’ but even in those states, organized gamma activity appeared in regions tied to visual awareness. “These four patients were comatose, unresponsive, doctors decided there’s no hope, they want to remove the ventilator—yet [in two of them], there’s massive brain activity still happening,” Borjigin explains. “That’s evidence not for gamma activity being a marker of NDEs, but rather the exact opposite,” he says.