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Online and Cross-User Finger Movement Pattern Recognition by Decoding Neural Drive Information from Surface

Haowen Zhao¹, Yunfei Liu¹, Xinhui Li²

¹School of Microelectronics, University of Science and Technology of China, Hefei, Anhui 230002, P. R. China.

International Journal of Neural Systems

|February 5, 2025

Summary

This study introduces a new method for recognizing finger movements using surface electromyogram (SEMG) signals. It significantly improves myoelectric control system accuracy by decoding individual motor unit (MU) activities, overcoming cross-user variability challenges.

Keywords:

Myoelectric pattern recognition cross-user motor unit online SEMG decomposition

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Area of Science:

Biomedical Engineering
Neuroscience
Machine Learning

Background:

Cross-user variability poses a significant challenge to the performance and robustness of myoelectric control systems.
Existing methods often struggle with adapting to new users, leading to degraded accuracy.

Purpose of the Study:

To develop a novel and robust method for myoelectric pattern recognition of finger movements.
To address the issue of cross-user variability in myoelectric control systems.

Main Methods:

A neural decoding approach combined with unsupervised domain adaptation (UDA) learning was employed.
Microscopic features of individual motor unit (MU) activities were extracted via two-stage online surface electromyogram (SEMG) decomposition.
A deep learning model was adaptively updated for new users, with decisions made using a fuzzy weighted strategy.

Main Results:

The proposed method achieved high accuracy in recognizing seven finger movement patterns under cross-user testing scenarios.
Recognition accuracy significantly surpassed conventional methods relying on global SEMG features.
The approach demonstrated robustness in handling individual differences in SEMG signals.

Conclusions:

The study presents a novel, robust myoelectric pattern recognition approach at the fine-grained motor unit (MU) level.
This method offers improved performance for myoelectric control systems, particularly in cross-user scenarios.
The approach has wide applications in neural interfaces and prosthesis control.