Nothing, except for the imaging equipment, chemical analyzers, computers to collate data, and technology that allows genetic study to give us insights and paths of study previously unavailable to us. Those are a few that came to mind. I'm sure I could come up with a bandwidth sucking, site crashing list with some detailed research.
That's wasted on the obtuse, however.
What you've come up with so far are 2 things, and Jack just left town.
Here's some bedtime reading to cozy up with since your credentials in calculators etc make you so much more knowledgeable than I in the realm of the human mind.
http://www.malleusmaleficarum.org/Make sure to finish up your plate Eddy, every little scrap of it.
Wouldn't want any of those - well, You know who - to get away.
You're the expert on 'Measuring Instruments.' Right?
Quick: What's NAVY Psychiatrist Dr Grace Jackson's bottom line on Brain Scans?
BTW ED, we can have this discussion on the level of your choosing, and so far you've chosen to tell me I should be Embarrassed. I'm Obtuse, and more.
If that's really the way you want it, Buckaroo, there's a huge difference between being ignorant and being stupid that so far has escaped you.