Sort of like large language models work on top of what our language has encoded in our massive training datasets, I think biological intelligence is built on top of the parts of the brain that encode the real physical world. These parts grow/train from embodied experimentation and instinct early on in an organism’s life and only then is higher intellect built on top of it (that’s my hypothesis). Their specialization and interconnections give rise to the hardest parts of intelligence long before we’re “thinking”.
Stuff like LLMs and chess engines work because we’ve done all the job of encoding the world into tokens/positions/etc they understand, but that’s wholly inadequate for the kind of AGI we’re striving for. Next up is giving it the tools to interact with the physical world and to really experiment with some self directed “play”. Time will tell just how high the resolution of sensor and mechanical control they’ll need (hopefully not the entire human visual cortex and entire sensory input worth). I think most of the RSI will have to occur in those lower level encoders, not LLMs.