# How does the frequency of a visual stimulus affect the steady-state visually evoked potential?

I want to make a project for EEG signal processing, and in my research I found the concept of SSVEP, which means that if you have a stimulus with low frequency applied to the eye, the electrical activity (measured via EEG) of the brain will change.

My question is whether is it known how the electric activity of brain will change? And a second thing, does it mean that each frequency applied the eye has a fixed reaction for the brain?

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i'm get confused , is amplitude modulation that you talked is the same amplitude modulation that is used in electrical communication systems ?(i don't think so). also , what is refresh rate of a display , is it the delay needed to display new "thing" ? –  Learner Jul 26 '14 at 21:12