[ExI] Scientists Discovered ?Mini-Computers? in Human Neurons?and That?s Great News for AI
avant at sollegro.com
Sun Jan 19 02:05:12 UTC 2020
Quoting John Clark:
> Landauer's law can't be responsible for the high energy usage of the
> brain, dendrites are not nearly small enough or fast enough for it
> to be important. At body temperature Landauer says you could erase
> 10^11 bits a second and use only 2.8* 10^-10 watts of energy. And
> remember signals in the brain only travel at a few hundred meters a
> second. Even our best microprocessors are much too large and much
> too slow for Landauer's law to be important, although in about 20
> years that could change and we'll have to start thinking about
> reversible computing.
Landauer's law is responsible in that it is defined as the lowest
possible energy it would take to erase a bit in a 100% efficient
computer. That is why it is expressed as greater-than-or-equal-to.
That it costs energy at all to erase information is a consequence of
Landauer's law. It is like a thermodynamic limit and it costs
biological brains more to erase bits because they are kludgy
naturally-evolved processors that uses selective movement of ions
across membranes rather than a simple current of electrons to perform
Action potentials happen in solution and involve moving entire atomic
species around in potential fields instead mere electrons so it is
bound to be many times more energetically costly than an electronic
Likewise using an abacus to calculate your mind instead of a
compartmentalized ion concentration gradient would take even more
energy and be even slower than your naturally-evolved brain.
Perhaps I should have specified that a combination of Landauer's law
and thermodynamics is responsible for the brain's high energy usage.
But I admit I could be wrong. Seems like it should be a testable
More information about the extropy-chat