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. 2017 May 22;11:286. doi: 10.3389/fnins.2017.00286

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Copyright © 2017 Käthner, Halder, Hintermüller, Espinosa, Guger, Miralles, Vargiu, Dauwalder, Rafael-Palou, Solà, Daly, Armstrong, Martin and Kübler.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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End user 4 during testing of the prototype. In (A) the split screen mode is shown. In (B) the spelling matrix is displayed in full screen mode. The selected symbols were displayed in the line above the matrix such that the user received feedback although the corresponding application window for spelling was not inside his field of view. (C) depicts a close-up of the user and the electrode cap and in (D) the window size of the spelling matrix is adjusted to fit the application window size of his conventional software (dasher) used for communication. End user 4 gained only rudimentary control over the spelling application and did not test the other applications. Pictures are published with consent from the participant and his legal representative.