Effect of electrical stimulus intensity to hempdynamic responses of somatosensory cortex

Hirotsugu Takata, Mingdi Xu, Takehito Hayami, Keiji Iramina

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

Abstract

To investigate the relationships between neuronal activity and hemodynamics, regional changes of hemoglobin concentration associated with cortical activation in the primary somatosensory cortex (SI) to the electrical stimulation were investigated by near-infrared spectroscopy (NIRS). We measured the hemodynamic evoked responses to the electrical stimuli of some intensities applied on the right thumb. NIRS measurements were performed on 3 healthy right-handed volunteers and we investigated the spatial and temporal features and the magnitude of the optical signal induced by cerebral activation. In this study, we consistently found that an increase in the cerebral concentration of oxygenated hemoglobin [oxy-Hb], and that a decrease in the cerebral concentration of deoxygenated hemoglobin [deoxy-Hb] at somatosensory area. Moreover, as the intensity of electrical stimuli changes stronger from 3 times to 6 times intensity of the sensory threshold of thumb, the increment of [oxy-Hb] and [total-Hb] are augmented.

Original languageEnglish
Title of host publicationProc. of 2007 Joint Meet. of the 6th Int. Symp. on Noninvasive Functional Source Imaging of the Brain and Heart and the Int. Conf. on Functional Biomedical Imaging, NFSI and ICFBI 2007
Pages280-282
Number of pages3
DOIs
Publication statusPublished - Dec 1 2007
Externally publishedYes
Event2007 Joint Meeting of the 6th International Symposium on Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, NFSI and ICFBI 2007 - Hangzhou, China
Duration: Oct 12 2007Oct 14 2007

Publication series

NameProc. of 2007 Joint Meet. of the 6th Int. Symp. on Noninvasive Functional Source Imaging of the Brain and Heart and the Int. Conf. on Functional Biomedical Imaging, NFSI and ICFBI 2007

Other

Other2007 Joint Meeting of the 6th International Symposium on Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, NFSI and ICFBI 2007
CountryChina
CityHangzhou
Period10/12/0710/14/07

Keywords

  • Electrical stimuli
  • Hemodynamic responses
  • Near-infrared spectroscopy (NIRS)
  • Somatosensory cortex

ASJC Scopus subject areas

  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Takata, H., Xu, M., Hayami, T., & Iramina, K. (2007). Effect of electrical stimulus intensity to hempdynamic responses of somatosensory cortex. In Proc. of 2007 Joint Meet. of the 6th Int. Symp. on Noninvasive Functional Source Imaging of the Brain and Heart and the Int. Conf. on Functional Biomedical Imaging, NFSI and ICFBI 2007 (pp. 280-282). [4387752] (Proc. of 2007 Joint Meet. of the 6th Int. Symp. on Noninvasive Functional Source Imaging of the Brain and Heart and the Int. Conf. on Functional Biomedical Imaging, NFSI and ICFBI 2007). https://doi.org/10.1109/NFSI-ICFBI.2007.4387752