Think about the human brain's ability to distinguish 2 nearly-identical sound frequencies. Our neural nets are masters of time domain signal analysis. Even the

Think about the human brain's ability to distinguish 2 nearly-identical sound frequencies. Our neural nets are masters of time domain signal analysis. Even the slightest shift in phase or frequency is usually perceptible. I think saccade plays a big role in how we perceive smoothness of motion and could also explain why some people don't really mind 60hz whereas others find it to be an affront to civilization. Just a little bit of difference between human visual systems could explain a large difference in final perception.