A BMI-based occupational therapy assist suit: asynchronous control by SSVEP.
A BMI-based occupational therapy assist suit: asynchronous control by SSVEP.
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DOI：
10.3389/fnins.2013.00172
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发表时间：
2013
影响因子：
4.3
通讯作者：
Kansaku K
中科院分区：
文献类型：
--
作者：
Sakurada T;Kawase T;Takano K;Komatsu T;Kansaku K
脑机接口（BMI）是一种使用来自大脑的神经生理信号来控制外部机器的接口技术。最近的侵入性BMI技术已经成功地对机器人手臂进行了一系列有用的动作控制，如伸手和抓握。在本研究中，我们开发了非侵入性BMI技术，旨在通过制备基于BMI的职业治疗辅助套装（BOTAS），利用受试者自己的双手进行这些有用的运动。我们准备了一系列预先录制的有用动作——抓球运动和拿球运动——并使用稳态视觉诱发电位（SSVEP）信号增加了异步控制。一个SSVEP信号被用来触发抓球运动，另一个SSVEP信号被用来触发持球运动。采用支持向量机对视觉皮层实时记录的脑电信号进行分类。未受过训练、身体健全的参与者（n = 12）成功地操作了系统。SSVEP检测的分类准确率为~88%，所需时间为3 s。我们进一步招募了3例上颈脊髓损伤（SCIs）患者；他们还在没有经过培训的情况下成功地操作了这个系统。这些数据表明，我们的BOTAS系统在上肢残疾患者的康复方面具有潜在的用途。
A brain-machine interface (BMI) is an interface technology that uses neurophysiological signals from the brain to control external machines. Recent invasive BMI technologies have succeeded in the asynchronous control of robot arms for a useful series of actions, such as reaching and grasping. In this study, we developed non-invasive BMI technologies aiming to make such useful movements using the subject's own hands by preparing a BMI-based occupational therapy assist suit (BOTAS). We prepared a pre-recorded series of useful actions—a grasping-a-ball movement and a carrying-the-ball movement—and added asynchronous control using steady-state visual evoked potential (SSVEP) signals. A SSVEP signal was used to trigger the grasping-a-ball movement and another SSVEP signal was used to trigger the carrying-the-ball movement. A support vector machine was used to classify EEG signals recorded from the visual cortex (Oz) in real time. Untrained, able-bodied participants (n = 12) operated the system successfully. Classification accuracy and time required for SSVEP detection were ~88% and 3 s, respectively. We further recruited three patients with upper cervical spinal cord injuries (SCIs); they also succeeded in operating the system without training. These data suggest that our BOTAS system is potentially useful in terms of rehabilitation of patients with upper limb disabilities.
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