title: A novel task-oriented optimal design for P300-based brain-computer interfaces.
abstract: Objective. The number of items of a P300-based brain-computer interface (BCI) should be adjustable in accordance with the requirements of the specific tasks. To address this issue, we propose a novel task-oriented optimal approach aimed at increasing the performance of general P300 BCIs with different numbers of items. Approach. First, we proposed a stimulus presentation with variable dimensions (VD) paradigm as a generalization of the conventional single-character (SC) and row-column (RC) stimulus paradigms. Furthermore, an embedding design approach was employed for any given number of items. Finally, based on the score-P model of each subject, the VD flash pattern was selected by a linear interpolation approach for a certain task. Main results. The results indicate that the optimal BCI design consistently outperforms the conventional approaches, i.e., the SC and RC paradigms. Specifically, there is significant improvement in the practical information transfer rate for a large number of items. Significance. The results suggest that the proposed optimal approach would provide useful guidance in the practical design of general P300-based BCIs.
authors: Department of Automatic Control, College of Mechatronic Engineering and Automation, National University of Defense Technology, 410073 Changsha, Hunan, People's Republic of China.
authors: Zongtan
authors: Z
authors: Zhou
authors: Erwei
authors: E
authors: Yin
authors: Yang
authors: Y
authors: Liu
authors: Jun
authors: J
authors: Jiang
authors: Dewen
authors: D
authors: Hu
mesh_terms: D000328:Adult; D062207:Brain-Computer Interfaces; D004562:Electrocardiography / Q000295:instrumentation / Q000379:methods*; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation / Q000379:methods*; D012107:Research Design; D013647:Task Performance and Analysis; D014796:Visual Perception / Q000502:physiology*; D014956:Writing; D055815:Young Adult