What he's seeing isn't something new, it's something so old that it's part of popular culture: the absent-minded professor syndrome. It's the stereotype of the brilliant physicist forgets what he's supposed to buy at the supermarket because he's thinking about their quantum properties. Analytic people are horrible at things that don't interest them.
Pay the students $50 for each correct answer, and there's not a doubt in my mind that the results will be the complete opposite of what he's seeing now.
Basically, once again, I've learned that my wife is smarter than me and that these studies should be taken with a grain of salt.
P.S. She is not a math person nor is she a tech person.
I think the reason why my wife did it so fast is because it was fed to her as text only - in fact, I just read it to her. She's a lawyer and she's much better at interpreting text than most people.
You've never tried tutoring kids who get kickbacks for good scores then. Absolute fucking nightmare. Motivation to study must come from within for it to be successful in any way.