“…Many SSVEP-based hybrid spellers have been proposed, and have delivered better performance than any single triggering method-based speller. Section 4 has provided several triggering methods that have been combined with the SSVEP to form a hybrid speller, including the visual ERP P300 [ 84 , 85 , 86 , 87 , 88 , 89 ], ET [ 96 , 97 , 98 , 99 , 100 , 101 ], EOG [ 102 , 103 ], and EMG [ 104 , 105 ].…”