Hi - Thanks for your contribution. I find it timely, as I have been giving this more thought lately. One of the major confusions I have is the definition of human-level and suprahuman-level intelligence. Missing from such discussions is intention. Perhaps a better term is “purpose”. Often I find discussions of intelligence identified as cps, or some other measure of algorithmic step measure, and there is usually no assessment of a potential non-linear nature of purpose or intent, which is uniquely complex in humans. Yet, purpose and intent is intricately intertwined with invention (which we can use lots more of). I do not think there is any evidence of a specially located brain region or structure that could contain such intentions. As yet, I have seen little or any discourse on this from a systems-level perspective. As you point out, monkey brains are not so very much smaller than human, but other than basic biological state drives, I have seen very limited intent or purpose literature that convinces me that even these extremely well designed brains exhibit the beginnings of human-level intentions or purposes. Your article alludes to “specialized structures” in human brains that diverge from lower primates. Which are you referring to? Prefrontal cortex? I know that J.C. Eccles went down that path a few years ago, but there was very limited scientific basis for his arguments. I point this out, as I think that there are some missing elements in purposeful behavior that are just assume to be small multipliers to get to “human-level intelligence”. There is a long distance between driving a car, and deciding that building a car is a worthwhile undertaking.