I suspect that at time of death, brain activity doesn't instantly cease, but decays.
Unless we would be able to monitor all brain activity, we are stuck with a bald man paradox, perhaps calculating the half-life of brain activity. Maybe we could attempt to measure the weight of the departing soul (Dr. Duncan MacDougall 1907)? Surely the soul of a time-nut is more substantial than, say, a politician. Mike (Dead Weight) AA8K On 10/24/2010 11:26 PM, Steve Rooke wrote:
But isn't the clinical definition of death, brain death, as the heart may stop but the person be resuscitated tens of seconds later. In our terms, tens of seconds is like a lifetime so heatbeat is out as the TOD metric. I would propose we develop a hat with inbuilt electrodes that touch the scalp and measure brain activity. Once this has decayed to the level as clinically defined as brain dead, a timestamp should be made against a standard that is reasonably accurate to the degree of uncertainty of the death event, IE. it is likely that the brain activity will stop instantly with such a sharp cutoff as to be less than a ms, us or whatever. The hat would include an integrated GPSDO built upon a flexible PCB board design with integrated path antenna positioned at the top. This could easily be powered by solar cells charging very thin lithium ion flexible batteries embedded in the hat. Of course the hat needs to be worn 24x7 so it would have to be of a design that lends itself to sleeping hours as well therefore being a sleeping cap so something like a beanie may be a starting point. Extensions to the design may be a time display which would, of course, double as the TOD display for those concerned with your internment and the engraving of your tombstone. A PPS and disciplined oscillator connection could also be incorporated as a form of mobile reference for the wearer. As for cleaning, two of such hats would be owned by the user with one "in the wash" while the other is being worn. Of course, careful planning and design needs to be taken in the choice of circuitry and construction so as to all the hat to be cleaned. There is, of course, the faint possibility of death during the swapping of but some careful planning of how to do the hat swap may alleviate this window. Steve
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