A BCI (brain computer interface) established a new direct communication channel using the brain activity between the human brain and machine. The visual stimulus with a certain frequency is present to the BCI users; it exists in a particular condition to observe a continuous brain response respect to frequent of visual stimuli. A significant problem when engaged the SSVEP (steady-state visual evoked potential) based on BCI, it will be exhausted and may suffer for the users when staring at flashing stimuli. This experimental study investigates how the differences in LED's-colors influence of SSVEP with respect to (i.e., frequencies and phases). The result shows that the visualization of phase delays in lower frequencies greater than in higher frequencies.
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