Electrode replacement does not affect classification accuracy in dual-session use of a passive brain-computer interface for assessing cognitive workload.

There was not a significant main effect of electrode replacement, F (1, 18) = 0.056, p = 0.815, η 2 p = 0.03, but the main effect of measurement time point approached significance, F (1.382, 24.877) = 3.224, p = 0.073, η 2 p = 0.152.

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The paired-samples t -tests, α = 0.01, with a mean difference of 0.565, 99% CI [0.017, 1.112], p = 0.008 for the ANN, 0.437, 99% CI [0.151, 0.722], p = 0.0003 for the LDA, 0.488, 99% CI [0.083, 0.892], p = 0.003 for the LIN-SVM, and 0.372, 99% CI [−0.111, 0.857], p = 0.040 for the RBF-SVM, all revealed significant differences or approached significance between the two approaches without any correction for multiple comparisons (noting that only the LDA result remained significant, p = 0.0012, after Bonferroni correction, with the ANN, p = 0.032, and the LIN-SVM, p = 0.012, approaching significance; the RBF-SVM, p = 0.16, would be considered not significant).

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