A novel paradigm based on radar-like scanning for directional recognition in event-related potentials based brain-computer interfaces

IF 2.3 4区医学 Q2 BIOCHEMICAL RESEARCH METHODS

Journal of Neuroscience Methods Pub Date : 2025-08-05 DOI:10.1016/j.jneumeth.2025.110546

Xueqing Zhao , Ren Xu , Yutao Zhang , Andrew Ty Lau , Ruitian Xu , Xingyu Wang , Andrzej Cichocki , Jing Jin

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引用次数: 0

Abstract

Background

Event-related potentials (ERPs) based brain-computer interface (BCI) systems have shown significant potential for directional control applications. Existing paradigms are constrained by the limited scalability of directional commands that demand interface reconfiguration for varying target numbers.

New method

We propose a novel radar-like scanning (RS) paradigm for 32-directional recognition tasks to address these limitations. This paradigm continuously scans through directions using a sector-shaped visual stimulus, naturally evoking ERP responses without discrete directional indicators. During the online experiments, an early-stopping strategy is employed to enhance efficiency. Additionally, this study analyzes subjects' directional recognition performance using EEGNet under three sector rotation periods. Thirteen subjects participated in the experiments.

Results

The grand-averaged ERP amplitudes exhibited a stronger negative deflection in the parietal, occipital, and temporoparietal regions. The results demonstrated that, with a 2 s rotation period and early-stopping strategy, the best subject achieved an accuracy of 87.50 % with a mean absolute angle error of 1.64°. When the directional error tolerance was set to 11.25°, the subject-averaged accuracy reached 91.83 % under the same conditions. Longer rotation periods led to better subject-averaged recognition performance. When the rotation period was short (1 s), targets close to the scanning center were challenging to recognize.

Comparison with existing methods

Compared with others, the RS paradigm enables more fine-grained directional target recognition and is unaffected by the target numbers.

Conclusions

The proposed paradigm demonstrates significant potential for applications in ERP-BCI systems.

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基于事件相关电位的脑机接口中，基于类雷达扫描的方向识别新范式

基于事件相关电位（ERPs）的脑机接口（BCI）系统在方向控制方面显示出巨大的应用潜力。现有范例受到定向命令的有限可扩展性的限制，定向命令要求为不同的目标数重新配置接口。我们提出了一种新的类似雷达的扫描（RS）范式，用于32方向识别任务，以解决这些限制。这种模式使用扇形视觉刺激连续扫描方向，自然地唤起ERP反应，而不需要离散的方向指标。在在线实验中，为了提高效率，采用了提前停止策略。此外，本研究还利用EEGNet分析了被试在三个扇区轮换周期下的方向识别表现。13名受试者参加了实验。结果大平均ERP振幅在顶叶区、枕叶区和颞顶叶区表现出较强的负偏转。结果表明，在2 s的旋转周期和提前停止策略下，最佳受试者的精度为87.50 %，平均绝对角度误差为1.64°。当定向误差容限为11.25°时，在相同条件下，被测对象平均精度达到91.83 %。更长的旋转周期导致更好的被试平均识别性能。当旋转周期较短（1 s）时，靠近扫描中心的目标难以识别。与现有方法的比较与其他方法相比，RS范式能够实现更细粒度的定向目标识别，并且不受目标数量的影响。结论所提出的范式在ERP-BCI系统中具有显著的应用潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Neuroscience Methods 医学-神经科学

CiteScore

7.10

自引率

3.30%

发文量

226

审稿时长

52 days

期刊介绍： The Journal of Neuroscience Methods publishes papers that describe new methods that are specifically for neuroscience research conducted in invertebrates, vertebrates or in man. Major methodological improvements or important refinements of established neuroscience methods are also considered for publication. The Journal''s Scope includes all aspects of contemporary neuroscience research, including anatomical, behavioural, biochemical, cellular, computational, molecular, invasive and non-invasive imaging, optogenetic, and physiological research investigations.