Figure 7From: (C)overt attention and visual speller design in an ERP-based brain-computer interfaceResults of the classification as a function of number of sequences. Thin colored lines indicate the performance of individual participants, the thick black line represents the mean in each subcondition. Accuracy approaches 100% using overt attention but is comparably low using covert attention. Hex-o-Spell outperforms the Matrix in both conditions.Back to article page