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. 2013 Mar 13;13(3):3454–3472. doi: 10.3390/s130303454

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 2. — The proposed device and experimental setting. (a) The gaze-tracking device and a commercial device for acquiring the EEG signals. (b) An example of using the speller UI system by combining the analysis of the EEG signals and gaze-tracking.