Motion resolution If your computer can play a game at a high enough frame rate to match a 120Hz or 240Hz monitor, you’ll see a noticeable change in the perceived sharpness of a moving image. Blurring occurs because of how the human brain processes the set of individual frames a monitor displays. The brain blurs together the series of frames to create a sensible moving picture, but some detail is lost along the way.
A higher refresh rate helps to decrease the blur by giving our brains more information to act on, in turn reducing perceived blur. However, unlike computer hardware, our brains aren’t all made to the same specification. Some people notice the difference between a 60Hz and 120Hz display immediately, while others can’t see what everyone is all worked up about. The difference between 120Hz and 240Hz is even more subtle