Kurzweil's whole idea is fallacious. People are not simply biochemical machines whose functioning can be reduced to circuitry. Even dogs have amazing ESP powers that are not currently scientifically understood, let alone capable of being replicated by computers. For more info on this see www.sheldrake.org.
"There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy."
"Hamlet", Act 1 Scene 5