It depends on how 'exact' exact is. For a brain, there are a finite number of neurons with a finite number of dendrites and axons. A quick search suggests 2.5 pentabytes (2.5 million GB) of storage http://www.scientificamerican.com/article/what-is-the-memory.... So about 2.5 thousand hard drives, so not an unreasonable amount of complexity to deal with today.
Your argument seems to suggest there is some finite level of complexity which is the limit of engineering. What is this limit and how is it justified?
If our ability to scale to complex systems scales linearly, this could take a very long time. If it follows a power law (like Moore's Law), it could be feasibly much faster.
The trash argument is weak because the pile serves an identical function regardless of how exact or inexact it is.
Probably the challenge is not in making an artificial brain, it is in reading a current one (especially one that is living without damaging it).
Your argument seems to suggest there is some finite level of complexity which is the limit of engineering. What is this limit and how is it justified?
If our ability to scale to complex systems scales linearly, this could take a very long time. If it follows a power law (like Moore's Law), it could be feasibly much faster.
The trash argument is weak because the pile serves an identical function regardless of how exact or inexact it is.
Probably the challenge is not in making an artificial brain, it is in reading a current one (especially one that is living without damaging it).