An optimized facial stimuli paradigm for hybrid SSVEP+P300 brain computer interface |
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| Affiliation: | 1. Department of Information Technology, G.H. Raisoni College of Engineering Nagpur, India;2. G.H. Raisoni College of Engineering Nagpur, India;1. The University of Queensland, Queensland Brain Institute, St Lucia, QLD 4072, Australia;2. The University of Queensland, School of Psychology, St Lucia, QLD 4072, Australia;1. Universidade Estadual Paulista, Department of Mechanical Engineering, Avenida Brasil, 56, 15385-000 Ilha Solteira, São Paulo, Brazil;2. Universidade Federal de São Paulo, Department of Neurology and Neurosurgery, Rua Pedro de Toledo, 669, São Paulo, São Paulo, Brazil;3. Universidade Estadual Paulista, Department of Mathematics, Alameda Rio de Janeiro, 266, 15385-000 Ilha Solteira, São Paulo, Brazil;1. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional, UNL, CONICET, FICH, Ruta Nac. 168, km 472.4, 3000 Santa Fe, Argentina;2. Facultad de Ingeniería, Universidad Nacional de Entre Ríos, Ruta Prov. 11, km 10, 3100 Oro Verde, Argentina;3. Instituto de Matemática Aplicada del Litoral, UNL, CONICET, FIQ, Predio Dr. Alberto Cassano del CCT-CONICET-Santa Fe, Ruta Nac. 168, km 0, 3000 Santa Fe, Argentina;1. School of Computer Science and Engineering, University of Electronic Science and Technology of China, Cheng Du, 610054, China;2. Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Cheng Du, 610054, China |
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| Abstract: | In this paper, hybrid BCI that merges Event Related Potentials (P300) and Steady State visual Evoked Potentials (SSVEP) simultaneously is proposed to enhance the performance of Four-choice command system. Here we integrate human facial structure in external visual stimulus to evoke stronger cortical responses in hybrid SSVEP+P300 BCI & compare it with non-face stimuli. We also addressed question of feasibility of eliciting one potential by face & other by non-face stimuli. To evoke SSVEP & P300 responses, paradigms with non-face stimuli, neutral face stimuli, and facial expression changes stimuli are proposed. We also projected additional paradigm where SSVEP is elicited by non-face and P300 by flashing different facial expressions. Results proved the last paradigm evoke stronger cortical potentials and thereby improve system accuracy and ITR than other paradigms. Author discussed external stimulus parameters that might affect simultaneous evocation of multiple brain potentials and their deterioration effect on individual potentials. |
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| Keywords: | Hybrid SSVEP+P300 BCI Stimulus features Facial stimuli Non-face stimuli |
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