I have collected a list of sf stories involving cognition enhancement. They are all over the place in terms of plausibility, and I was honestly surprised by how little useful ideas of the impact of enhancement they had. Maybe it is easier to figure out the impact of spaceflight. I think the list might be useful as a list of things we might want to invent and common tropes surrounding enhancement rather than any start for analysis of what might actually happen.
Have you written on that anywhere?