Table 1.

Laplace channel position, combination of motor imagery tasks and online BCI performance for every subject

Subject	BCI control tasks	ADM CoG-nearest electrode		Mu-modulation center		Significance
		Laplace position	Online performance	Laplace position	Online performance
5	Right hand vs. feet	mC3	59 %	C3	96 %	***
8	Right hand vs. feet	mC3	87 %	C3	95 %	*
11	Right hand vs. feet	mC3	91 %	C3	92 %	n.s.
2	Right hand vs. feet	mC4	48 %	C4	92 %	***
4	Right hand vs. feet	mC3	65 %	C3	90 %	***
1	Right hand vs. feet	mC3	47 %	pC3	73 %	***
7	Right hand vs. feet	C3	37 %	lC3	72 %	***
6	Left hand vs. feet	mC4	57 %	pC4	64 %	n.s.
3	Right hand vs. feet	amC3	47 %	C3	56 %	n.s.
9	Right hand vs. feet	Identical with mu-modulation center		mC4	53 %	-
10	Left hand vs. feet	Identical with mu-modulation center		amC3	45 %	-
Mean of online performance		-	57.8 %	-	75.3 %	**

Subjects are ranked by their online performance using the mu-modulation center. Most subjects showed a significantly better online BCI performance, when the mu-modulation center was used as the center of a next-neighbor Laplacian channel compared to the motor hand area. Prefixes of Laplace electrode positions: m = 23 mm medial to [electrode position] (Example: mC3 = 23 mm medial to C3), l = 23 mm lateral to [electrode position], a = 23 mm anterior to [electrode position], p = 23 mm posterior to [electrode position] (all electrode positions are also visualized in Fig. 2). Significance levels were *p < 0.05, **p < 0.01, ***p < 0.001 and n.s. p > = 0.05