New Scientist: The Last Word Science Questions and Answers

How long is the interval of consciousness after the head is severed? In France, in the days of the guillotine, some of the condemned were asked to blink their eyes if they were still conscious after the knife fell. Reportedly, their heads blinked for up to 30 seconds after decapitation. How much of this was voluntary and how much due to reflex nerve action is speculation. Most nations with science sophisticated enough to determine this question have long since abandoned decapitation as a legal tool.



Dale McIntyre, University of Cambridge







Answer

Antoine Lavoisier, the French chemist who lived between 1743 and 1794, was caught up in the revolution and faced beheading. He asked friends to observe closely as he would continue blinking as long as possible after being killed. He was reported to have blinked for 15 seconds after decapitation.