[Lerc]

There are separate tests for the extremes, but obviously less researched because the further out you go the less they have to work on.

Many years ago, while unemployed, I was sent for a intelligence and dyslexia test (because of the very same perceived waste of potential that the article talks about). I was not dyslexic but scored above the range that the intelligence test could measure. The professor(I believe he was moonlighting for research funding) performing the test talked about the upper range tests, but said they were very long, required specialists to conduct and there's seldom any reason to investigate where you are in the upper range.

Then we went on to waste a huge amount of time talking about human perception and I remember describing an idea that finally seems to be feasible because the new Steam VR headset does it and calls it Foveated rendering.

I can't specifically recall the date of this but the tester was recording results on his palm pilot, which was a flash new thing at the time.