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Figure 3. Schematics that represent behavior of three different system approaches to video-oculography (VOG)+ electromyographic (EMG) multimodal interaction: Systems with (a) no communication in which all activations detected by EMG system generate click event, (b) communication in which only activations detected when fixation is present generate click event, and (c) communication and fixation delay correction in which activations occurring within temporal window before fixation are detected by VOG system also generate click event that is sent to operating system as soon as VOG reports fixation. 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