I remember reading that the fastest human reflexes and computational outputs seem to happen around 100ms, and it takes roughly 10ms to transmit a signal from ne

I remember reading that the fastest human reflexes and computational outputs seem to happen around 100ms, and it takes roughly 10ms to transmit a signal from neuron to neuron, so that would imply 10 layers deep is enough for, for example, human level visual recognition. Of course, the human brain is highly recurrent, so it gets much more complicated for any higher level thinking. And it's also much, much wider than our neural networks, even if not spectacularly deep.