Henry Spencer skrev:

Snip

It was tried in the 60s, deliberately on animals and once accidentally on
a spacesuit technician (early in Apollo suit development). The first
significant event is passing out when the deoxygenated blood reaches your
brain. All other effects are much slower. If you're repressurized within
maybe 30 seconds total, there seems to be no permanent injury.
-- |

It was also tried in arather more drastic way in 1902 IIRC.

That was a french doctor, who wanted to see how long time there is a
consciousness after they cut the head of a convict with the
guilliotine.

So he talked it through with the unfortunate victim, and performed the
experiment, shouting the mans name at him.

Last response was 15 sec. after loosing the head.

Regards

Carsten Nielsen
Denmark