A Robust and Self-Paced BCI System Based on a Four Class SSVEP Paradigm: Algorithms and Protocols for a High-Transfer-Rate Direct Brain Communication

<table>Occurrences of each stimulation frequency of the screened 6–17 Hz range calculated
on both G1 and G2 control groups.</table>

Computational Intelligence and Neuroscience

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Figure 9

Figure 9: A Robust and Self-Paced BCI System Based on a Four Class SSVEP Paradigm: Algorithms and Protocols for a High-Transfer-Rate Direct Brain Communication 

Figure 9 | A Robust and Self-Paced BCI System Based on a Four Class SSVEP Paradigm: Algorithms and Protocols for a High-Transfer-Rate Direct Brain Communication 