An SSVEP BCI to Control a Hand Orthosis for Persons With Tetraplegia
An SSVEP BCI to Control a Hand Orthosis for Persons With Tetraplegia
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DOI：
10.1109/tnsre.2010.2076364
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发表时间：
2011-02-01
影响因子：
4.9
通讯作者：
Pfurtscheller, Gert
中科院分区：
文献类型：
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作者：
Ortner, Rupert;Allison, Brendan Z.;Pfurtscheller, Gert
脑机接口（BCI）系统允许人们在不动的情况下发送消息或命令，因此可以为运动功能有限的人提供替代的通信和控制渠道。在这项研究中，我们展示了用于矫形器控制的 BCI 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，而不是根据外部提示调整自己的节奏。七名受试者每人使用依赖稳态视觉诱发电位 (SSVEP) 的 BCI 执行两项任务。尽管没有受试者接受过任何培训，但有 6 名受试者表现出良好的控制能力，阳性预测值 (PPV) 高于 60%。所有受试者的总体 PPV 达到 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，我们希望通过将该 BCI 与“大脑开关”混合来减少误报率和闪烁灯光产生的烦恼，这可以让人们在不希望控制矫形器时使用第二种类型的大脑活动打开或关闭 SSVEP 系统。我们还希望在四肢瘫痪的人身上验证这种方法。
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.