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A lower limb exoskeleton control system based on steady state visual evoked potentials.

No-Sang Kwak1, Klaus-Robert Müller, Seong-Whan Lee

  • 1Department of Brain and Cognitive Engineering, Korea University, Anam-dong, Seongbuk-ku, Seoul, Korea.

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|August 21, 2015
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This study presents a novel asynchronous brain-machine interface (BMI) for lower limb exoskeleton control using steady-state visual evoked potentials (SSVEPs). The system enables users to control exoskeleton movements with high accuracy, paving the way for feasible gait assistance.

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Area of Science:

  • Neuroscience
  • Robotics
  • Biomedical Engineering

Background:

  • Brain-machine interfaces (BMIs) offer potential for assistive devices.
  • Controlling lower limb exoskeletons requires intuitive and reliable interfaces.
  • Steady-state visual evoked potentials (SSVEPs) provide a robust signal for BMI control.

Purpose of the Study:

  • To develop an asynchronous BMI control system for a lower limb exoskeleton.
  • To utilize steady-state visual evoked potentials (SSVEPs) for real-time exoskeleton control.
  • To evaluate the feasibility of SSVEP-based BMI for gait assistance.

Main Methods:

  • Developed an asynchronous BMI system using SSVEP detection.
  • Real-time decoding of electroencephalography (EEG) signals.
  • Employed canonical correlation analysis (CCA) and k-nearest neighbors for SSVEP frequency extraction.
  • Integrated a visual stimulation unit with light-emitting diodes on the exoskeleton.

Main Results:

  • Achieved high classification accuracy (91.3 ± 5.73%) in healthy subjects.
  • Demonstrated a response time of 3.28 ± 1.82 seconds.
  • Reported an information transfer rate of 32.9 ± 9.13 bits/min.
  • Successful control for walking, turning, sitting, and standing movements.

Conclusions:

  • The developed SSVEP-based BMI system enables effective control of a lower limb exoskeleton.
  • High-quality BMI control signifies the feasibility of SSVEP-based gait assistance exoskeletons.
  • This technology holds promise for individuals requiring mobility support.