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  1. Figure 2. Schematics that represent behavior of video-oculography (VOG) and electromyographic (EMG) systems: (a) VOG system outputs are (x, y) coordinates of gaze within screen (shown only in one dimension for sake of clarity) and Boolean flag indicating fixation. Fixation delay is minimum time starting at physiological fixation required by system to activate fixation flag. (b) EMG signal is processed by EMG system for determining activation of muscle. Activation delay is processing delay of system, and refractory period is temporal window in which EMG system may not generate any additional activation signal. Navallas J, Ariz M, Villanueva A, San Agustín J, Cabeza R. Optimizing interoperability between video-oculographic and electromyographic systems.J Rehabil Res Dev. 2011; 48(3):253-66.DOI:10.1682/JRRD.2010.06.0112

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