There’s an interesting editorial at Mikhailtech regarding FPS, refresh rates and what the brain really distinguishes. Although he has no scientific background experience he has assembled some interesting facts. You can get more information on how the brain interprets visual data here.My Opinion: It is important to clearly understand the difference between refresh rates (screen updates, relates to screen flickering) and FPS (amount of pictures per second, relates to animation smoothness) for understanding how the brain works. For example the movies you normally see in a cinema have 24FPS at 48Hz. Having a higher FPS than your refresh rate is however total nonesense. Regarding games on computer display certain experts told me that 40FPS (due to sharper less transistional images) at 85Hz (due to lower persistence of phosphor) could be considered ideal.