How many frames per second can the human eye see?
This is a tricky question. And much confusion about it is related to the fact, that this question is NOT the same as: How many frames per second do I have to have to make motions look fluid?
And it's not the same as: How many frames per second makes the movie stop flickering?
And it's not the same as: What is the shortest frame a human eye would notice?
Website 100fps.com beautifully explains and illustrates the relationship between smoothness of motion, frames per second and sensitivity of the human eye. Highly recommended reading.