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Tripolar concentric ring electrodes for capturing localised electroencephalography signals during sleep.

Nicole Stuart1,2, Jack Manners1,2, Eva Kemps2

  • 1Flinders Health and Medical Research Institute: Sleep Health, Flinders University, Adelaide, South Australia, Australia.

Journal of Sleep Research
|March 28, 2024
PubMed
Summary

Tripolar concentric ring electrodes (TCRE) offer more focal brain activity signals than conventional electroencephalography (EEG) during sleep. TCRE also demonstrated fewer noisy data epochs, suggesting improved signal quality for sleep studies.

Keywords:
EEG acquisitionTCREhealthy sleepersquantitative EEGsleep stagestripolar concentric ring electrodes

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Sleep Medicine

Background:

  • Conventional electroencephalography (EEG) electrodes have limitations in signal focality.
  • Tripolar concentric ring electrodes (TCRE) are designed for more localized brain activity measurement.
  • Understanding electrode performance during sleep is crucial for accurate neurophysiological assessment.

Purpose of the Study:

  • To compare the spectral characteristics of TCRE and conventional EEG signals during sleep.
  • To evaluate the rate of data loss due to noisy epochs between TCRE and EEG.
  • To investigate the potential of TCRE for regional brain activity analysis during sleep.

Main Methods:

  • 20 healthy sleepers underwent polysomnography with TCRE and conventional EEG setup.
  • Spectral analysis using fast Fourier transform (FFT) with multitaper estimation was applied to sleep epochs.
  • Statistical comparison of noisy epochs and relative spectral power across sleep stages and frequency bands.

Main Results:

  • TCRE exhibited lower relative spectral power in alpha, beta, sigma, and theta bands, and higher delta power compared to EEG across all sleep stages.
  • Distinct beta activation patterns were observed in the right parietal lobe with TCRE.
  • TCRE showed significantly lower rates of noisy epochs (0.8%) compared to conventional EEG (1.3%).

Conclusions:

  • TCRE signals display marked differences from conventional EEG, reflecting more focal measurements and region-specific activity during sleep.
  • TCRE may offer advantages in evaluating regional brain activity with reduced muscle artifacts compared to conventional EEG.
  • These findings support the utility of TCRE in sleep studies requiring precise localization of brain activity.