The frequency profile of somatosensory evoked magnetic fields in the developing brain

Y. Wang, J. Xiang, D. F. Rose, T. Holroyd, E. Harris, T. J. DeGrauw

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The objective of this paper is to study the variations of magnetic fields evoked by index finger stimulation in four age groups (6-9, 10-13, 14-17 and 18-49 years old) of normal population. We recorded magnetic fields during unilateral electrical stimulation of the index finger in 60 healthy children (7±1.2, 12±1.3 and 15±1.1) and 20 healthy adults (30±5.7) using a 275-channel whole head magnetoencephalography (MEG) system. Each group consisted of 10 females and males. Electrical stimulation was applied in randomized order to the right or left index finger with two digital rings. One hundred trials were recorded for both the right and left index finger stimulations. MEG data were analyzed in both the time and frequency domains. Brain regions associated with finger stimulations were localized with the equivalent current dipoles (ECDs). Time-frequency analysis was at the source level with a vector beamformer and Morlet wavelets. Our data have revealed evoked neuromagnetic signals in low-frequency ranges (10-40 Hz). In addition, the spectrograms revealed consistent focal increases of spectral power around 120-200 Hz in the left and right hemispheres in children. Furthermore, the neuromagnetic activation above 200 Hz was also observed, which were in the frequency range of 600-890 Hz. The preliminary data suggest that neuromagnetic signals above 120 Hz in the developing brain are noninvasive detectable.

Original languageEnglish (US)
Title of host publication17th International Conference on Biomagnetism Advances in Biomagnetism - Biomag2010
Pages254-257
Number of pages4
DOIs
StatePublished - 2010
Event17th International Conference on Biomagnetism Advances in Biomagnetism, Biomag2010 - Dubrovnik, Croatia
Duration: Mar 28 2010Apr 1 2010

Publication series

NameIFMBE Proceedings
Volume28
ISSN (Print)1680-0737

Other

Other17th International Conference on Biomagnetism Advances in Biomagnetism, Biomag2010
CountryCroatia
CityDubrovnik
Period3/28/104/1/10

Keywords

  • Beamformer
  • Index finger stimulation
  • Magnetoencephalography
  • Virtual sensor

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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