I know nothing about AI but my ignorant impression is that there are essentially two ways to achieve AGI: 1) We somehow model GI artificially, which seems like

I know nothing about AI but my ignorant impression is that there are essentially two ways to achieve AGI: 1) We somehow model GI artificially, which seems like an impossible task. 2) Or instead we just model the fundamental neural mechanisms (dentrites, axons, etc) and find a way to copy the state of a brain into a sufficiently powerful computer. Is this correct or are there different approaches?