STUDY OF THE EFFECT OF MAGNETIC FIELDS ON ELECTROENCEPHALOGRAPHY MEASUREMENT IN FARADAY’S CAGE

  • Galih Restu Fardian Suwandi Nuclear Physics and Biophysics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132
  • Siti Nurul Khotimah Nuclear Physics and Biophysics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132
  • Freddy Haryanto Nuclear Physics and Biophysics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132
  • Suprijadi Suprijadi Instrumentation and Computational Physics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132
Keywords: electroencephalography, power spectral density, Faraday’s Cage, signal

Abstract

Electroencephalography (EEG) is a method for recording the brain's electrical activity through electrodes placed on the scalp's surface. The amplitude of the EEG signal is in the 40–100 V range, with the five main frequencies in the 0 to 100 Hz range. The EEG is non-stationary and very susceptible to various disturbances, especially frequency disturbances, so eliminating troubles in the raw EEG data is essential to obtain helpful information reflecting brain activity. Interference in the EEG signal comes from muscles, eye movement and blinking, power lines, and interference with other devices. The distractions overlap. Shielding is required to perform an EEG without the risk of interference and ambient background noise. This study tested how the influence of magnetic field disturbances on EEG measurements was carried out in the Faraday cage and an unprotected room. The magnetic field was measured before, during, and after the EEG was operated. EEG measurements were performed on subjects who were conditioned to rest for 5 minutes. The EEG signals generated when EEG recordings were performed in the Faraday and the unprotected rooms were compared. It was found that the difference in the value of the magnetic field originating from electronic devices around the subject does not significantly affect the EEG measurement results.

References

S. Sanei and J. A. Chambers, “EEG Signal Processing,” John Wiley and Sons Ltd, pp. 313, 2007.

M. Darbas and S. Lohrenger, “Review on mathematical modelling of electroencephalography (EEG),” Jahresber Dtsch Math, vol. 91, no. 2, pp. 67-72, 2018.

S. N. Khotimah et al., “Characterization of the changes in electroencephalogram power spectra due to sound stimulation,” Journal of Physics Conference Series, vol. 1248, no. 1, p. 012022, 2019.

I. Seleznov et al., “Detrended fluctuation, coherence and spectral power analysis of activation rearrangement in eeg dynamics during cognitive workload,” Frontiers in Human Neuroscience, vol. 13, p. 270, 2019.

L. Shao et al., “A flexible dry electroencephalogram electrode based on graphene materials,” Mater Res Express, vol. 6, p. 085619, 2019.

G. Repovs, “Dealing with Noise in EEG Recording and Data Analysis,” Informatica Medica Slovenia, vol. 15, no. 1, 2010.

“How to reduce noise in EEG recordings,” https://mentalab.com/insights/how-to-reduce-noise-in-eeg-recordings/4/2021 (accessed 1 May 2021).

N. Fathima and K. Umarani, “Reduction of Noise in EEG Signal using Faraday's Cage and Wavelets Transform A comparative Study,” International Journal of Engineering Science and Computing, pp. 8566-8569, 2016.

H. K. Mclsaac et al., “Claustrophobia and the magnetic resonance imaging,” J Behav Med, vol. 21, pp. 255-268, 1998.

Published
2021-10-30
How to Cite
Suwandi, G. R. F., Khotimah, S. N., Haryanto, F., & Suprijadi, S. (2021). STUDY OF THE EFFECT OF MAGNETIC FIELDS ON ELECTROENCEPHALOGRAPHY MEASUREMENT IN FARADAY’S CAGE. Spektra: Jurnal Fisika Dan Aplikasinya, 6(2), 101 - 106. https://doi.org/10.21009/SPEKTRA.062.02