title: [Off-line experiments and analysis of independent brain--computer interface].
abstract: In order to study event-related desynchronization (ERD) related to voluntary movement, we designed two experiments. In the first experiment, untrained subjects were required to imagine the action of typing with left or right index finger for about 1 second before real action, whereas they were required to type instantly after instruction in the second experiment. By analyzing spontaneous EEG signals between the instruction and the action, we predicted which finger was used. The prediction accuracy in the first experiment fell from 85% to 71% with the progress of experiment, the average accuracy being 78%, whereas the prediction result was almost random guess in the second experiment. The results demonstrate that (1) ERD patterns are significantly affected by the effective duration of motion imagination, (2) unconscious reduction of this duration can decrease the prediction accuracy. Therefore, when designing subsequent BCI experiments, we should devote our attention to the question of how to keep the effective duration of motion imagination.
authors.affiliation: Department of Electronic Science & Technology, USTC, Hefei 230026, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Chen
authors.forename: Hu
authors.initials: H
authors.lastname: Peng
authors.forename: Chaohui
authors.initials: C
authors.lastname: Jiang
authors.forename: Huanqing
authors.initials: H
authors.lastname: Feng
mesh_terms: D001921:Brain / Q000502:physiology*; D003344:Cortical Synchronization; D004569:Electroencephalography; D006801:Humans; D008328:Man-Machine Systems; D013647:Task Performance and Analysis; D014584:User-Computer Interface