Social constructs are a spawn of consciousness, not intelligence.
The irregular folds in brain matter is the reason we have the ability to manipulate conscious thought.
The folds are a result of a mechanical instability known as buckling, as well as evolutionary adaptation but we won't get into that.
“Our research shows that if a part of the brain does not grow properly, or if the global geometry is disrupted, we may not have the major folds in the right place, which may cause dysfunction in the brain,†(the article isn't really an academic source but, people are talking about this shit)
EDIT: Sorry I forgot to explain why I put that quote there. I thought it might be obvious but, my point is. Intelligence is a result of physical brain structure, chemical balances in the brain, function and spacing of synapses, etc. Not to mention the impact of say, a metabolic issue, or a glandular mishap. Every little detail. Even the way you think affects your brains chemistry positively or negatively. You're welcome.