A large scale screening study with a SMR-based BCI: Categorization of BCI users and differences in their SMR activity.

Among the asked variables tiredness , motor imagination strength , motivation , anger , and uneasiness , all except for anger were highly significant correlated (Spearman correlation) with the feedback performance: tiredness with r = -0.18, p < 0.05, MI strength with r = 0.44 and p < 10 −9 , motivation with r = 0.29 and p < 0.001, and uneasiness with r = -0.25 and p < 0.01.

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