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prase comments on Against WBE (Whole Brain Emulation) - Less Wrong
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Against the feasibility? Heck yes. It's a ridiculously hard technical problem. Building a mind from scratch sounds much easier. Airplanes were invented in 1903 and we still don't have a scanner that can copy birds.
Storage requirements for example. There are about 10^11 neurons and 10^14 synapses. If we don't model them all, there is absolutely no guarantee that you'll get a human, let alone a specific human. And there's some news that glial cells play an important role in cognition, too, so that's another couple hundred billion cells and more connections.
Even if saying everything important about a cell or synapse only takes 10 bytes, that still a few internetworths of data to keep running in parallel. In contrast, there are plenty of optimizing tricks that you can play with something made out of code rather than opaque physical data. Even if the first seed AI is as complicated as a human brain, it could be smushed down to smaller processing requirements because it's in an easily manipulable language. So if computing power requirements end up determining which comes first, it seems quite likely that seed AI comes first.
To keep the metaphor precise, we'd need only to copy the bird's technology of flight, which is its physical shape and its flying technique, not the whole internal structure. The reason we don't do it is that we already have better means of air transportation, rather than unfeasibility of bird emulation.
And we do, in fact, have toys that achieve flight by being bird-shaped and flapping their wings.