[neuromantik8086]

I mean, a lot of the brain is devoted to sensation, so if you don't care about simulating how the brain interprets certain aspects of sensation (motion, depth, vision more generally) you could probably simulate other functions. For memory, however, at least, there's a lot of evidence that you'll need to simulate sensory systems to be able to accurately simulate recall [0].

[0] https://books.google.com/books?id=VjZyDwAAQBAJ&pg=PT597&lpg=...