This is good news for all of us who believe we still have additional potential for biological evolution before we need to plug in non-biological implants.
A new study, Brain reorganization, not relative brain size, primarily characterizes anthropoid brain evolution, published by Proceedings of the Royal Society B, shows that brain organization is more important than size. This aligns completely with observations that brain size, even when adjusted for body size, seems to have minimal correlation with intelligence or abilities to function as a human.
Although brain size must still be of some importance, this study makes it clear that it is not everything. This also shows that evolution has already developed a solution to the brain’s energy problem by developing a way of increasing intelligence and capability without requiring more energy.
I have speculated that there was a major change in brain organization approximately 60-90,000 years ago that accounts for the capabilities of modern humans. I have also speculated that our brains are still evolving and reorganizing and that new abilities may be developing in the human psyche.
Although the full study seems to be pay walled, a good explanation of it can be found at Live Science.