Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea.
Sensors (Basel). 2021 Mar 24;21(7):2278. doi: 10.3390/s21072278.
To implement a practical brain-computer interface (BCI) for daily use, continuing changes in postures while performing daily tasks must be considered in the design of BCIs. To examine whether the performance of a BCI could depend on postures, we compared the online performance of P300-based BCIs built to select TV channels when subjects took sitting, recline, supine, and right lateral recumbent postures during BCI use. Subjects self-reported the degrees of interference, comfort, and familiarity after BCI control in each posture. We found no significant difference in the BCI performance as well as the amplitude and latency of P300 and N200 among the four postures. However, when we compared BCI accuracy outcomes normalized within individuals between two cases where subjects reported relatively more positively or more negatively about using the BCI in a particular posture, we found higher BCI accuracy in those postures for which individual subjects reported more positively. As a result, although the change of postures did not affect the overall performance of P300-based BCIs, the BCI performance varied depending on the degree of postural comfort felt by individual subjects. Our results suggest considering the postural comfort felt by individual BCI users when using a P300-based BCI at home.
为了实现实用的脑机接口（BCI）日常使用，在设计BCI 时必须考虑到在执行日常任务时不断变化的姿势。为了研究BCI 的性能是否取决于姿势，我们比较了在使用 BCI 时，当被试处于坐姿、斜倚、仰卧和右侧卧位时，构建用于选择电视频道的基于 P300 的 BCI 的在线性能。被试在每种姿势下自我报告 BCI 控制后的干扰、舒适度和熟悉度。我们发现，在四种姿势中，BCI 性能以及 P300 和 N200 的幅度和潜伏期没有显著差异。然而，当我们将个体内标准化的 BCI 准确性结果与被试在特定姿势下报告使用 BCI 相对更积极或更消极的两种情况下进行比较时，我们发现个体被试报告更积极的姿势的 BCI 准确性更高。因此，尽管姿势的变化并没有影响基于 P300 的 BCI 的整体性能，但 BCI 的性能取决于个体被试感觉的姿势舒适度。我们的研究结果表明，在使用基于 P300 的 BCI 时，需要考虑个体 BCI 用户的姿势舒适度。
