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A portable cortical evoked potential operant conditioning system (C-EPOCS): System development.

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This study adapted the Cortical-Evoked Potential Operant Conditioning System (C-EPOCS) for portable, real-time neurofeedback. Lower sampling rates for electroencephalography (EEG) and electromyography (EMG) data acquisition still enabled accurate H-reflex and M-wave assessments for system calibration.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Technology

Background:

  • The Cortical-Evoked Potential Operant Conditioning System (C-EPOCS) traditionally requires complex setups.
  • Portable biosignal acquisition systems often have lower sampling rates than high-resolution systems.
  • Lower sampling rates may impact the detection of transient responses like H-reflex and M-wave.

Purpose of the Study:

  • To adapt C-EPOCS into a portable, user-friendly platform for real-time neurofeedback.
  • To integrate electroencephalography (EEG) and electromyography (EMG) data acquisition into a single system.
  • To evaluate if lower-resolution EMG signals can support H-reflex and M-wave recruitment curves for stimulation intensity determination.

Main Methods:

  • Adapted C-EPOCS for portable EEG and EMG data acquisition.
  • Evaluated EMG signals sampled at lower rates (∼600 Hz and ∼300 Hz) for H-reflex and M-wave recruitment curves.
  • Assessed an automated response delineation algorithm for real-time M-wave and H-reflex identification.

Main Results:

  • Lower sampling rates (∼600 Hz, ∼300 Hz) showed increased data dispersion but yielded comparable estimates for Hmax and Mthreshold.
  • The automated algorithm reliably identified M-wave and H-reflex responses in real time despite reduced signal clarity.
  • A portable C-EPOCS system capable of real-time EEG and EMG feedback is feasible.

Conclusions:

  • A portable C-EPOCS system is feasible for real-time neurofeedback using integrated EEG and EMG.
  • Lower sampling rates are acceptable for determining key stimulation parameters (Hmax, Mthreshold).
  • Practical hardware recommendations are provided for reliable portable neurofeedback systems.