Historically it was more about people who had some part of their brain removed or otherwise grossly damaged, but the principle is the same: when people lose part of their brain, how does their mind change? What can they still do, what can they not?
After I had been on blood thinners for a bit and my mind recovers I sat down at a problem that I couldn’t figure out for six months. 10 minutes later it was done.
Had an ER visit were I was getting all questions wrong. Year, president, etc. I knew my answers were wrong. But I didn’t know why, or what they should be.
Perhaps diet, exercise, and evidenced based treatments would be a good place to start.
I guess you are not Japanese because they are about 10years ahead of everyone else on vit K studies, but its likely you do know something because vitamin RDA's do control the behaviour of populations. Personality and behaviours is massively controlled by our diet and you dont this many people living on a planet in close proximity without some dietary changes to manipulate people into docility.
2 days without blood thinners and symptoms start returning hard.