Is it true that if someone’s head is chopped off they are still alive for like 0.4356576878344545 seconds?

Question: Is it true that if someone's head is chopped off they are still alive for like 0.4356576878344545 seconds?
- Keywords:
  alive,
  chopped,
  dead,
  death,
  decapitation,
  head,
  living
Asked by bieberrocksduh to Cathal, Daphne, Darren, Jon, Katherine on 16 Mar 2012.
- Katherine Haxton answered on 16 Mar 2012:
  
  Interesting question…it may take a couple of seconds for the main organs like the heart to stop working so if that’s your definition of being alive then yes.
  That’s a very precise length of time you’ve given there 😉

Question: Is it true that if someone's head is chopped off they are still alive for like 0.4356576878344545 seconds?