In recent years, there has been a growing number of researches on steady state visual evoked potential (SSVEP) in brain–computer interface (BCI) systems. Some of these researches need to adjust the amplitude of SSVEP, while others need to keep SSVEP stable. Based on these demands, nowadays, there are a lot of researches on SSVEP amplitude adjustment. And this article presents a “flickering square” method to adjust the amplitude of SSVEP by controlling the subject’s attention. The flickering square has changeable stimulus intensity. If subjects looked at the flickering square, we can change the stimulus intensity to adjust SSVEP amplitude of subjects. Preliminary results also show that this method indeed achieve the adjustment of SSVEP. In fact, this adjustment method can be used in some close-loop SSVEP BCI systems to control SSVEP.
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