I think you are assuming the human brain is significantly simpler and better than it is. To start with: the number of neurons in the brain is ~100 billion, whic

I think you are assuming the human brain is significantly simpler and better than it is. To start with: the number of neurons in the brain is ~100 billion, which is roughly 10,000 times more than in a large ANN, we train the human brain for years before it does anything remotely intelligent (as opposed the the expectation that neural nets will get somewhere useful in hours or days) and most importantly: our brains probably have strong priors due to millions of years of evolution encoded in our DNA. On top of this, not all brains are as good as each other, especially when you think about animals who do not have a real system of speech.