Bilateral connectivity in the somatosensory region using near-infrared spectroscopy (NIRS) by wavelet coherence

Raul Fernandez Rojas, Xu Huang, Keng Liang Ou

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

3 Citations (Scopus)

Abstract

Near-infrared spectroscopy (NIRS) has been used in medical imaging to obtain oxygenation and hemodynamic response in the cerebral cortex. This technique has been applied in cortical activation detection and functional connectivity in brain research. Despite some advances in functional connectivity, most of the studies have focused on the prefrontal cortex and little has been done to study the somatosensory region (S1). For that reason, the aim of our present study is to assess bilateral connectivity in the somatosensory region by using NIRS and noxious stimulation. Eleven healthy subjects were investigated using near-infrared spectroscopy during an acupuncture stimulation procedure to safely induce pain in subjects. A multiscale analysis based on wavelet transform coherence (WTC) was designed to assess the functional connectivity of corresponding channel pairs within the left and right s1 region. The cortical activation in the somatosensory region was higher after the acupuncture stimulation, which was consistent with similar studies. The coherence in time-frequency domain between homologous signals generated by contralateral channel pairs revealed two main periods (3.2 s and 12.8 s) with high coherence. Based on the WTC analysis, it was also found that the coherence increase in these periods was task-related. This study contributes to the research field to investigate cerebral hemodynamic response of pain perception using NIRS and demonstrates the use of wavelet transform as a method to investigate functional lateralization in the cerebral cortex.

Original languageEnglish
Title of host publicationSPIE BioPhotonics Australasia
PublisherSPIE
Volume10013
ISBN (Electronic)9781510604346
DOIs
Publication statusPublished - 2016
EventSPIE BioPhotonics Australasia - Adelaide, Australia
Duration: Oct 17 2016Oct 19 2016

Other

OtherSPIE BioPhotonics Australasia
CountryAustralia
CityAdelaide
Period10/17/1610/19/16

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Keywords

  • Brain imaging
  • functional connectivity
  • NIRS
  • pain
  • wavelet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Fernandez Rojas, R., Huang, X., & Ou, K. L. (2016). Bilateral connectivity in the somatosensory region using near-infrared spectroscopy (NIRS) by wavelet coherence. In SPIE BioPhotonics Australasia (Vol. 10013). [100131Z] SPIE. https://doi.org/10.1117/12.2242977