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Originally Posted by ContentSHOOTER
I heard something very similar, that the brain functions for 7 secs then it's lights out... 
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You have around 12-15 total seconds of maximum 'brain activity'. However, the question is do you actually have 12-15 seconds of cognitive awareness, or does the sheer force from the guillotine render you unconscious instantly? Most believe the latter, some however do believe that you could have self-awareness for up to 15 seconds.