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Jeffrey M Weiss1, Sharlene N Flesher, Robert Franklin

  • 1Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, PA, United States of America. Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, United States of America.

Journal of Neural Engineering
|November 17, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to remove electrical artifacts from brain-computer interface (BCI) recordings during simultaneous stimulation. This artifact rejection technique allows for seamless bidirectional BCI control, restoring performance to pre-stimulation levels.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Rehabilitation Engineering

Background:

  • Intracortical microstimulation is promising for brain-computer interfaces (BCIs) to evoke sensory perceptions.
  • Electrical artifacts from microstimulation interfere with real-time signal recording for BCI control.
  • Effective artifact removal is crucial for uninterrupted bidirectional BCI decoding.

Purpose of the Study:

  • To develop a robust method for simultaneous recording and stimulation in a bidirectional BCI system.
  • To eliminate electrical artifacts without complex parameter adjustments.
  • To validate the artifact rejection scheme in a clinical BCI setting.

Main Methods:

  • A modification combining signal blanking and digital filtering was applied to an existing clinical BCI system.
  • A sample-and-hold circuit and a 750 Hz high-pass Butterworth filter were used for artifact rejection.
  • The scheme was validated by recording from motor cortex during stimulation in a spinal cord injury patient.

Main Results:

  • Spike detection in the motor cortex resumed as early as 740 µs post-stimulation.
  • Bidirectional BCI control performance significantly declined without artifact rejection.
  • With artifact rejection, BCI control performance remained consistent, regardless of stimulation.

Conclusions:

  • The proposed technique enables artifact-free recordings during bidirectional BCI control.
  • Simple filtering and digital signal blanking modifications are effective.
  • This method utilizes FDA-cleared hardware for clinical applicability.