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利用触觉 ERD 减少体感脑-机接口的校准时间。

Reducing the Calibration Time in Somatosensory BCI by Using Tactile ERD.

出版信息

IEEE Trans Neural Syst Rehabil Eng. 2022;30:1870-1876. doi: 10.1109/TNSRE.2022.3184402. Epub 2022 Jul 15.

DOI:10.1109/TNSRE.2022.3184402
PMID:35767500
Abstract

OBJECTIVE

We propose a tactile-induced-oscillation approach to reduce the calibration time in somatosensory brain-computer interfaces (BCI).

METHODS

Based on the similarity between tactile induced event-related desynchronization (ERD) and imagined sensation induced ERD activation, we extensively evaluated BCI performance when using a conventional and a novel calibration strategy. In the conventional calibration, the tactile imagined data was used, while in the sensory calibration model sensory stimulation data was used. Subjects were required to sense the tactile stimulus when real tactile was applied to the left or right wrist and were required to perform imagined sensation tasks in the somatosensory BCI paradigm.

RESULTS

The sensory calibration led to a significantly better performance than the conventional calibration when tested on the same imagined sensation dataset ( [Formula: see text]=10.89, P=0.0038), with an average 5.1% improvement in accuracy. Moreover, the sensory calibration was 39.3% faster in reaching a performance level of above 70% accuracy.

CONCLUSION

The proposed approach of using tactile ERD from the sensory cortex provides an effective way of reducing the calibration time in a somatosensory BCI system.

SIGNIFICANCE

The tactile stimulation would be specifically useful before BCI usage, avoiding excessive fatigue when the mental task is difficult to perform. The tactile ERD approach may find BCI applications for patients or users with preserved afferent pathways.

摘要

目的

我们提出一种基于触觉诱发振动的方法,以减少体感脑-机接口(BCI)的校准时间。

方法

基于触觉诱发事件相关去同步(ERD)与想象感觉诱发 ERD 激活之间的相似性,我们广泛评估了使用传统和新校准策略时 BCI 的性能。在传统校准中,使用触觉想象数据,而在感觉校准模型中使用感觉刺激数据。当左或右腕部实际受到触觉刺激时,要求受试者感知触觉刺激,并在体感 BCI 范式中执行想象感觉任务。

结果

当在相同的想象感觉数据集上进行测试时,感觉校准明显优于传统校准([公式:见文本]=10.89,P=0.0038),准确性平均提高了 5.1%。此外,感觉校准在达到 70%以上准确性的性能水平时快了 39.3%。

结论

使用感觉皮层的触觉 ERD 提出了一种有效减少体感 BCI 系统校准时间的方法。

意义

触觉刺激在 BCI 使用前特别有用,可以避免在难以执行心理任务时产生过度疲劳。触觉 ERD 方法可能会为保留传入途径的患者或用户找到 BCI 应用。

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