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Hybrid eye-brain-computer interfaces (EBCIs)can employ a slow negative EEG wave as a marker for gaze dwells used for interaction. This study examined previously reported relation of the marker’s lateralization to the direction of gaze. It turned out that the marker itself is not related to the gaze direction and the apparent lateralization is caused by another signal superimposed on it. Thus, the marker can be used in BCIs/EBCIs independently of gaze direction.