Guger Technologies OG, 4521 Schiedlberg, Austria.
IEEE Trans Neural Syst Rehabil Eng. 2011 Feb;19(1):1-5. doi: 10.1109/TNSRE.2010.2076364. Epub 2010 Sep 23.
Brain-computer interface (BCI) systems allow people to send messages or commands without moving, and hence can provide an alternative communication and control channel for people with limited motor function. In this study, we demonstrate a BCI system for orthosis control. Our BCI was asynchronous, meaning that subjects could move the orthosis whenever they wanted, instead of pacing themselves to external cues. Seven subjects each performed two tasks with a BCI that relied on steady state visual evoked potentials (SSVEPs). Although none of the subjects had any training, six subjects showed good control with a positive predictive value (PPV) higher than 60%. The overall PPV for all subjects reached 78% ±10%. However, the false positive rate was high, and some subjects dislike the flickering lights required in SSVEP BCIs. In follow-up work, we hope to reduce both the false positive rate and the annoyance produced by flickering lights by hybridizing this BCI with a "brain switch," which could allow people to turn the SSVEP system on or off using a second type of brain activity when they do not wish to control the orthosis. We also hope to validate this approach with people with tetraplegia.
脑机接口（BCI）系统允许人们无需移动即可发送消息或命令，因此可以为运动功能受限的人提供替代的通信和控制渠道。在这项研究中，我们展示了一种用于矫形器控制的脑机接口系统。我们的脑机接口是异步的，这意味着受试者可以随时移动矫形器，而不必按照外部提示调整自己的节奏。7 名受试者每人都使用基于稳态视觉诱发电位（SSVEP）的脑机接口执行了两项任务。尽管没有受试者接受过任何培训，但有 6 名受试者的控制效果很好，正预测值（PPV）高于 60%。所有受试者的总体 PPV 达到了 78%±10%。然而，假阳性率很高，并且一些受试者不喜欢 SSVEP BCI 所需的闪烁灯光。在后续工作中，我们希望通过将这种脑机接口与“脑开关”混合，降低假阳性率和闪烁灯光带来的烦恼，当人们不想控制矫形器时，他们可以使用第二种类型的脑活动来打开或关闭 SSVEP 系统。我们还希望通过四肢瘫痪患者来验证这种方法。
