New answers tagged neuroimaging
Complexity. That is, the fundamental laws governing the behavior isn't terribly difficult to comprehend or model. However, putting it all together and hoping it reproduces the correct behavior is a great challenge. Once you develop a model that has the appropriate underlying mechanisms in it's components, you still have to put them all together and ...
I don't think it is hard to simulate a neuron. See NEURON. Simulating a brain however is a much more difficult (and unaccomplished) task, even if the brain only consists of 302 neurons.
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