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According to a paper published in Cureus, people lose consciousness within seconds of being decapitated. This is because the brain's higher functions stop working when the blood supply and oxygen are cut off. Some say that people can remain conscious for around 4–5 seconds after decapitation, which would be enough time for the severed head to fall and roll around.

A laboratory study that used EEG monitoring on rats found that they became unconscious within 3–4 seconds of decapitation. The study also found that a large wave recorded by the EEG about a minute after decapitation is likely a sign of brain death.

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What an unusual 3-4 seconds that must be.

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what? rats? too cruel..

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Yeah, I know it's too cruel and it's the most common being tested on rats in worldwide for experiments.

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Very interesting, cool how the body works

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