The primary purpose of this paper was to find the relationship between the participants’ disability and user performance on a P300-based brain-computer interface (BCI) — P300 Speller. Ten participants with motor disabilities were employed to spell 10 ten-character phrases with two different user interfaces (5 for each). Results of the study indicated a linear relation between participants’ speech ability and task performance. As the speech ability increases, users’ task performance increases. However, such a relation doesn’t exist between motor ability and task performance. This study should provide invaluable empirical data and insights for the future study.
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