I really doubt that an LLM (a transformer) can be extended into a brain just by adding all the missing pieces. A pre-trained transformer is just fundamentally d

I really doubt that an LLM (a transformer) can be extended into a brain just by adding all the missing pieces. A pre-trained transformer is just fundamentally different - it's really just a rules-based expert system (cf. Cyc) not the beginnings of any cognitive architecture. That said, if you wanted to make the least-worst analogy between a pre-trained transformer and part of the brain, then I suppose it'd be like a single pass though the cortex (although the same could be said of a CNN, which tells you how poor the analogy is).