基于复杂任务相关成分分析的稳态体感诱发电位运动意象解码

IF 4.9 2区医学 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computer methods and programs in biomedicine Pub Date : 2024-09-19 DOI:10.1016/j.cmpb.2024.108425

Xiaoyan Wang , Hongzhi Qi

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引用次数: 0

摘要

背景和目的运动想象（MI）识别是脑-计算机接口领域最关键的解码问题之一。与稳态体感诱发电位（MI-SSSEP）相结合，这一新范式可获得比传统 MI 范式更高的识别准确率。典型的算法没有充分考虑 MI-SSSEP 信号的特点。方法本文根据 SSSEP 信号的特点，提出了使用复杂信号任务相关分量分析（cTRCA）算法进行空间滤波处理的想法。研究通过对模拟信号的分析证明，任务相关成分分析法（TRCA）作为一种典型的方法，在刺激物之间的响应相关性降低时会受到影响，而本文提出的算法可以有效克服这一问题。在 MI-SSSEP 范式下使用实验数据识别右手目标任务，并使用三个独特的干扰任务测试误触发率，经 Wilcoxon 符号秩检验证实，cTRCA 表现出更优越的性能。结果 cTRCA 与基于互信息的最佳个体特征（MIBIF）和最小平均距离（MDM）相结合的识别算法可获得高达 0.89 的 AUC 值，远高于与支持向量机（SVM）相结合的传统算法普通空间模式（CSP）（平均 AUC 值为 0.77，p <0.05）。与 CSP+SVM 相比，该算法模型将误触发率从 38.69 % 降至 20.74 %（p < 0.001）。结果进一步证明，新范式 MI-SSSEP 中的运动想象任务会引起诱发电位的相位变化，而基于这种相位变化的 cTRCA 算法更适合这种混合范式，更有利于解码运动想象任务和降低误触发率。

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Decoding motor imagery loaded on steady-state somatosensory evoked potential based on complex task-related component analysis

Background and objective

Motor Imagery (MI) recognition is one of the most critical decoding problems in brain- computer interface field. Combined with the steady-state somatosensory evoked potential (MI-SSSEP), this new paradigm can achieve higher recognition accuracy than the traditional MI paradigm. Typical algorithms do not fully consider the characteristics of MI-SSSEP signals. Developing an algorithm that fully captures the paradigm's characteristics to reduce false triggering rate is the new step in improving performance.

Methods

The idea to use complex signal task-related component analysis (cTRCA) algorithm for spatial filtering processing has been proposed in this paper according to the features of SSSEP signal. In this research, it's proved from the analysis of simulation signals that task-related component analysis (TRCA) as typical method is affected when the response between stimuli has reduced correlation and the proposed algorithm can effectively overcome this problem. The experimental data under the MI-SSSEP paradigm have been used to identify right-handed target tasks and three unique interference tasks are used to test the false triggering rate. cTRCA demonstrates superior performance as confirmed by the Wilcoxon signed-rank test.

Results

The recognition algorithm of cTRCA combined with mutual information-based best individual feature (MIBIF) and minimum distance to mean (MDM) can obtain AUC value up to 0.89, which is much higher than traditional algorithm common spatial pattern (CSP) combined with support vector machine (SVM) (the average AUC value is 0.77, p < 0.05). Compared to CSP+SVM, this algorithm model reduced the false triggering rate from 38.69 % to 20.74 % (p < 0.001).

Conclusions

The research prove that TRCA is influenced by MI-SSSEP signals. The results further prove that the motor imagery task in the new paradigm MI-SSSEP causes the phase change in evoked potential. and the cTRCA algorithm based on such phase change is more suitable for this hybrid paradigm and more conducive to decoding the motor imagery task and reducing false triggering rate.

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来源期刊

Computer methods and programs in biomedicine 工程技术-工程：生物医学

CiteScore

12.30

自引率

6.60%

发文量

601

审稿时长

135 days

期刊介绍： To encourage the development of formal computing methods, and their application in biomedical research and medical practice, by illustration of fundamental principles in biomedical informatics research; to stimulate basic research into application software design; to report the state of research of biomedical information processing projects; to report new computer methodologies applied in biomedical areas; the eventual distribution of demonstrable software to avoid duplication of effort; to provide a forum for discussion and improvement of existing software; to optimize contact between national organizations and regional user groups by promoting an international exchange of information on formal methods, standards and software in biomedicine. Computer Methods and Programs in Biomedicine covers computing methodology and software systems derived from computing science for implementation in all aspects of biomedical research and medical practice. It is designed to serve: biochemists; biologists; geneticists; immunologists; neuroscientists; pharmacologists; toxicologists; clinicians; epidemiologists; psychiatrists; psychologists; cardiologists; chemists; (radio)physicists; computer scientists; programmers and systems analysts; biomedical, clinical, electrical and other engineers; teachers of medical informatics and users of educational software.