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1999 Fiscal Year Final Research Report Summary

A study on spatiotemporal visual information processing in human

Research Project

Project/Area Number 09670659
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Neurology
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

TABIMATSU Shozo  Dept. of Clinical Neurophysiology, Graduate School of Medical Sciences, Kyushu University, Professor, 大学院・医学系研究科, 教授 (40164008)

Project Period (FY) 1997 – 1999
KeywordsVisual information / Parallel processing / Magnocellular system / Parvocellular system / Magnetoencephalography / Intracerebral network
Research Abstract

1. Background : There are two major parallel pathways that process visual information processing in human. Magnocellular (M) system projects to the parietal lobe via the primary visual cortex (V1) and is important for motion and stereopsis. Parvocellular (P) system consist of the ventral pathway from V1 to the temporal lobe and plays an important role in color and from perception. We investigated the visual information processing by using visual evoked potentials (VEPs), visual evoked magnetic fields (VEFs) recorded by magnetoencephalography (MEG) and event-related potentials (ERPs).
2. Subjects and Methods : Visual stimuli such as color and motion were used to segregate the function of the M and P pathways in V1 in normal subjects. Then, visual stimuli such as words and faces were used to study the function of the ventral pathway. In addition, we studied the visual function in patients with higher brain dysfunction.
3. Results : We obtained the following results. 1) Chromatic stimuli evoked N120 in VEPs and N120m in VEFs while motion stimuli evoked P120 in VEPs and P120m in VEFs. Their neural generators were estimated in V1 but they showed different behaviors. These results suggest that the presence of the parallel processing in V1. However, we could not obtain reliable signals in MEG from the higher visual cortex. 2) VEPs to words and faces showed P170 at the vertex. However, we could not obtain reliable sources of these potentials by MEG. 3) Our methods were useful in evaluating the brain function in patients with associative visual agnosia and cerebral achromatopsia.
4. Perspective : A combined use of VEPs, MEG and ERPs is useful in evaluating the spatiotemporal information processing in normal subjects as well as patients. Our future plan is aimed at combining the electrophysiological data with neuroimaging techniques such as position CT and functional MRI to assess the human brain function.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Tobimatsu S, Zhang Y-M et al: "Chromatic sensitive epilepsy- A variant of photosensitive epilepsy."Ann Neurol. 45(6). 790-793 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakawa K, Tobimatsu S et al: "Parvocellular and magnocellular visual processing in spinocerebellar degeneration and parkinson's disease: An event-related potential study."Clin Neurophysiol. 110(6). 1048-1057 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tobimatsu S, Shigeto H etal: "Electrophysiological studies of parallel visual processing in humans."Electroenceph clin Neurophysiol (suppl). 49. 103-107 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakawa K, Tobimatsu S et al: "The effects of spatial frequency on chromatic and achromatic steady-state visual evoked potentials"Clin Neurophysiol. 110(11). 1959-1964 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakawa K, Tobimatsu S et al: "Effect of stimulus orientation on the VEP spatial frequency function."Exp Brain Res. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tobimatsu S, Celesia GG et al: "Recent advances in clinical neurophysiology vision."Electroenceph clin Neurophysiol (suppl). (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 飛松省三: "日本視覚学会(編):視覚情報処理ハンドブック,朝倉書店,東京"脳機能イメージングによる視覚機能測定法.(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tobimatsu S, Zhang Y-M, Tomoda Y, Mitsudome A, and Kato M.: "Chromatic sensitive epilepsy - A variant of photosensitive epilepsy"Ann Neurol. 45(6). 790-793 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Arakawa K, Tobimatsu S, Kato M, and Kira J.: "Parvocellular and magnocellular visual processing in spincerebellar degeneration and Parkinson's disease : An event-related potential study"Clin Neurophysiol. 110(6). 1048-1057 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tobimatsu S, Shigeto H, Arakawa K, and Kato M.: "Electrophysiological studies of parallel visual processing in humans"Electroenceph clin Neurophysiol (suppl). 49. 103-107 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Arakawa K, Tobimatsu S, Tomoda Y, Kira J, and Kato, M.: "The effects of spatial frequency on chromatic and achromatic steady-state visual evoked potentials"Clin Neurophysiol. 110(11). 1959-1964 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shigeto H, Tobimatsu S, Yamamoto T, KiraJ, and Kato M.: "Visual evoked cortical fields to color and motion stimulation"In : Yoshimoto T, Kotani M, Kuriki S, Karibe H, Nakasato N (eds9, Recent Advanced in Biomagnetism, Tohoku University Press, Sendai. 585-588 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Arakawa K, Tobimastu S, Kurita-Tashima S, Nakayama M, Kato M, and Kira J.: "Effect of stimulus orientation on the VEP spatial frequency function"Exp Brain Res. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tobimatsu S, Celesia GG, Haug BA, Onofrj M, Sartucci F, and Porciatti V.: "Recent advances in clinical neurophysiology of vision"Electroenceph clin Neurophysiol (suppl). (in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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