One problem a lot of those studies have is it doesn’t factor in how you can get used to something and then notice a change. I remember when I was a kid that happening with headphones. I thought my good headphones weren’t that large of an improvement until I had to borrow somebody else’s years later and thought they sounded like absolute junk.
So somebody might not be able to tell much of a difference between 144 and 240 if they’re sitting side by side, but they might be able to tell the difference very easily if they’re used to one and then switch to the other. People are also more sensitive to negative changes, so you’re more likely to notice the difference between the two if you go from 240 to 144 versus 144 to 240.
Somebody below me posted a link to a study showing that humans can detect differences up to about 1000, and most can easily tell the difference between 240 and 360.
The entire purpose of this subreddit is to advertise gadgets.