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Robotics in Neurorehabilitation: Beyond the Hype—Understanding What It Can (and Cannot) Do

Dr. Rishabh Pathak
Over the past decade, robotic neurorehabilitation has become one of the most discussed innovations in neurological recovery. Robotic gait trainers, upper-limb rehabilitation systems, exoskeletons, and AI-assisted rehabilitation devices are increasingly being adopted by hospitals and rehabilitation centres worldwide. However, an important question remains: Are robots the future of neurorehabilitation—or are they simply another tool in the rehabilitation toolbox? As clinicians and researchers, we must move beyond marketing claims and focus on scientific evidence, patient selection, and clinical reasoning. What is Robotic Neurorehabilitation? Robotic neurorehabilitation involves the use of electromechanical devices that assist, guide, resist, or augment movement during therapy. These technologies include: • Robotic gait trainers • Wearable exoskeletons • Upper limb robotic rehabilitation devices • End-effector robotic systems • Sensor-based rehabilitation platforms • AI-assiste...
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Electrode Contact Artifacts

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Dr. Rishabh Pathak

Electrode contact artifacts are another type of electrode artifact that can affect EEG recordings. 


1.     Description:

oNature: Electrode contact artifacts occur when there is poor contact between the electrode and the skin, leading to signal disturbances in EEG recordings.

oAppearance: These artifacts manifest as unstable impedance, resulting in sharp or slow waves of varying waveform and amplitude.

oLocalization: Electrode contact artifacts are limited to the channels of the problematic electrode, indicating a localized source of disturbance.

2.   Causes:

oFactors: Poor electrode contact can be caused by issues such as loose electrodes, corrosion, drying of the electrolyte paste or gel, or inadequate connection to the amplifier.

o Instability: The instability in impedance due to poor contact can result in irregular waveforms that may recur as ongoing activity, potentially appearing rhythmic.

3.   Differentiation:

oWaveform Variability: Electrode contact artifacts exhibit waveform variability across occurrences, in contrast to the consistent waveform of electrode pop artifacts.

o Amplitude Changes: These artifacts may show fluctuations in amplitude and waveform characteristics, reflecting the instability in electrode contact.

4.   Recognition:

o Visual Cue: The waveform of electrode contact artifacts may not resemble cerebrally generated EEG activity, appearing more noise-like in nature.

o Localization: Identifying electrode contact artifacts involves recognizing their presence in the channels of the problematic electrode, distinguishing them from other types of artifacts.

Understanding the characteristics and causes of electrode contact artifacts is essential for EEG technicians and clinicians to identify and address these disturbances in EEG recordings. Proper management of electrode contact artifacts is crucial for maintaining the quality and accuracy of EEG data interpretation in clinical and research settings.

 

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