Optimizing SSVEP-Based BCI System towards Practical High-Speed Spelling

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1. Introduction Brain?computer interfaces (BCIs) allow users to communicate with the external devices by converting brain signals into commands [1,2]. BCIs can help people with neuromuscular diseases to improve the life quality [3] or help special appliance operators like astronauts whose movements were restricted by the environment to work more efficiently [4,5]. As a kind of brain signal that owns high temporal resolution and convenience of acquisition, electroencephalogram (EEG) is welcomed by BCI researchers. Event-related potentials (ERPs) [6,7], steady-state visual evoked potentials…

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