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Fixation and saccade generation by the frontal eye field

Research Project

Project/Area Number 13480275
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 神経・脳内生理学
Research InstitutionTokyo Medical and Dental University

Principal Investigator

SHINODA Yoshikazu  Tokyo Medical and Dental University, Graduate School, Professor, 大学院・医歯学総合研究科, 教授 (60010104)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥13,200,000 (Direct Cost: ¥13,200,000)
Fiscal Year 2002: ¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 2001: ¥7,000,000 (Direct Cost: ¥7,000,000)
Keywordsfrontal eye field / saccade / fixation / smooth pursuit eye movement / 眼球運動 / 上丘
Research Abstract

It has been well known that the frontal eye field (FEF) is responsible for generation of saccadic eye movements. Recently, it turns out that the FEF is also involved in generating smooth pursuit eye movement and convergence eye movement.
In contrast, the present study was aimed at identifying the area in the FEF where electrical stimulation produced suppression of saccadic eye movements in the monkey. In addition, the properties of the suppression on saccades were investigated by changing various parameters for the electrical stimulation. For this purpose, the monkeys were trained in a conventional way to make visually-guided saccades to a visual target on the screen in front of them. Then, the FEF was systematically surveyed to find an area whose stimulation suppresses visually-guided saccades. Stimulus intensity for intracortical microstimulation was limited to less than 50 μA. In a fairly wide area of the classical FEF where stimulation produced saccades, stimulation with intensities … More sub threshold for saccade generation could suppress the saccades ipsilateral to the stimulation side, but not the saccades contralateral to it. In contrast, stimulation of the area adjacent to the classical FEF where no saccades were evoked at 100 μA, stimulation at less than 50 μA could easily suppress saccades in both ipsi- and contralateral directions. Stimulation of this site suppressed saccades in 8 directions covering all directions, and strengths of the suppression on the saccades in these different directions were almost equal. This suppression continued as the stimulus duration was increased. Thresholds for the suppression on saccades in ipsi- and contralateral directions were as low as 10 μA and almost equal. To examine the properties of neurons in this suppression area of the FEF, spikes were recorded during the fixation task. Neurons in this area showed increase of activities during the fixation even without a fixation target. These neurons stopped firing at the onset of saccades in any directions. Further properties of these neurons in response to the fixation task are now being investigated. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Y.Sugiuchi: "Functional synergies among neck muscles revealed by branching patterns of single, long descending motor-tract axons"Prog. Brain Res.. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 伊藤正男: "神経科学"三輪書店. 410 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y, Sugiuchi.: "Functional synergies among neck muscles revealed by branching patterns of single, long descending motor-tract axons"Prog. Brain Res.. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M, Ito.: "Neuroscience"Miwa-shoten. 410 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Sugiuchi: "Functional synergies among neck muscles revealed by branching patterns of single, long descending motor-tract axons"Prog. Brain Res.. (印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 伊藤正男: "神経科学"三輪書店. 410 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Kakei: "Thalamic terminal morphology and distribution of single coritcothalamic axons originating from layers 5 and 6 of the cat motor cortex"J. Comp. Neurol.. 437. 170-185 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] I. Sugihara: "The entire trajectories of single olivocerebellar axons in the cerebellar cortex and their contribution to cerebellar compartmentalization"J. Neurosience. 21. 7715-7723 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 那 杰: "神経科学の基礎と臨床、運動性視床への大脳からの入力神経回路"(in press). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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