Pyrexia is triggered by the hypothalamus, a small gland located in the brain and the body's internal thermostat that is activated by pyrogens in the bloodstream. Pyrogens are released into the bloodstream from injured body tissues or from the presence of disease cuasing microorganisms.
The refresh rate your screen is running at will be listed in a little window within a drop down list eg, 60 Hertz, 70 Hertz, 72 Hertz and on uop depending on what your monitor can handle.
I'm not sure of the engish term but I think it's retinal persistence. the problem is that the eye has not the same refresh rate on all it's surface. I got sensitive eyes and that's why I'm very picky about refresh rates. i need 80Hz to feel comfortable when looking at the screen. any lower i can see it flash.