Fig 1.
a) Schematic overview of the c-VEP BCI system. b) The intended route consists of 25 steps: six steps forward, three steps backward, two turns left, three steps forward, two turns right, three steps forward, and six steps backward.
Fig 2.
The two-step algorithm considers one or two blocks of two-second EEG at a time. The correlation coefficients from newly acquired EEG with known templates were used as features in the classification. Upon classification, the procedure repeats and two new seconds of EEG were recorded.
Table 1.
Pseudorandom sequence details.
Fig 3.
The ACFs of the m-code (red, dashed), gold-code (blue, dash-dot), and Barker-code (black, solid) all resemble delta functions.
Fig 4.
The three boxes overlap to a high degree.
Table 2.
Experimental results.
Table 3.
Benefit from choosing optimal sequence over average sequence.
Table 4.
Average TPI for trials sorted by accuracy.
Table 5.
Accuracy prediction.