用脑电控制轮椅实现流畅追击式移动,更自然稳定。
Feasibility of Embodied Dynamics Based Bayesian Learning for Continuous Pursuit Motion Control of Assistive Mobile Robots in the Built Environment
- 基于运动动力学的贝叶斯推断解码脑电信号,实现连续速度方向控制
- 相比传统方法误差降低72%,在四名受试者16小时数据上验证
- 适合残障人士在复杂环境如机场医院中自由灵活移动
非侵入式脑电图(EEG)脑机接口为严重运动障碍者提供独立操作助行机器人轮椅的直观方式。尽管脑机接口研究取得显著进展,当前多数运动控制系统仍局限于离散指令,无法支持连续追击式控制——即用户可实时自由调节速度与方向。这种自然移动能力对轮椅使用者在交通枢纽、机场、医院及室内走廊等复杂公共空间中敏捷社交互动、灵活舒适移动至关重要。本研究提出并验证了一种受大脑启发的贝叶斯推理框架,通过解码基于加速度的运动动力学表征中的具身动态,弥补了这一空白。该方法区别于传统运动学解码与深度学习方法。利用包含四位受试者十六小时电机想象目标追踪数据的公开数据集,结合自动相关性确定特征选择与持续在线学习,结果显示,在会话累积迁移学习设置下,预测速度与真实速度间的归一化均方误差相比自回归和EEGNet方法降低72%。理论层面,这些发现实证支持具身认知理论,揭示大脑在具身与预测性上的内在运动控制机制;实践层面,将脑电信号解码建立在生物运动所遵循的动力学原理之上,为更稳定、直观的脑机接口控制提供了前景。
原文摘要 · Abstract (English)
Non-invasive electroencephalography (EEG)-based brain-computer interfaces (BCIs) offer an intuitive means for individuals with severe motor impairments to independently operate assistive robotic wheelchairs and navigate built environments. Despite considerable progress in BCI research, most current motion control systems are limited to discrete commands, rather than supporting continuous pursuit, where users can freely adjust speed and direction in real time. Such natural mobility control is, however, essential for wheelchair users to navigate complex public spaces, such as transit stations, airports, hospitals, and indoor corridors, to interact socially with the dynamic populations with agility, and to move flexibly and comfortably as autonomous driving is refined to allow movement at will. In this study, we address the gap of continuous pursuit motion control in BCIs by proposing and validating a brain-inspired Bayesian inference framework, where embodied dynamics in acceleration-based motor representations are decoded. This approach contrasts with conventional kinematics-level decoding and deep learning-based methods. Using a public dataset with sixteen hours of EEG from four subjects performing motor imagery-based target-following, we demonstrate that our method, utilizing Automatic Relevance Determination for feature selection and continual online learning, reduces the normalized mean squared error between predicted and true velocities by 72% compared to autoregressive and EEGNet-based methods in a session-accumulative transfer learning setting. Theoretically, these findings empirically support embodied cognition theory and reveal the brain's intrinsic motor control dynamics in an embodied and predictive nature. Practically, grounding EEG decoding in the same dynamical principles that govern biological motion offers a promising path toward more stable and intuitive BCI control.
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