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Experimental and Clinical Study of Auditory Evoked Potentials

Research Project

Project/Area Number 62570652
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Cerebral neurosurgery
Research InstitutionHamamatsu University School of Medicine

Principal Investigator

YOKOYAMA Tetsuo  Hamamatsu Univ. School of Medicine, Dept. of Neurosurgery, Research Associate, 医学部・脳神経外科, 助手 (20166896)

Co-Investigator(Kenkyū-buntansha) RYU Hiroshi  Hamamatsu Univ. School of Medicine, Dept. of Neurosurgery, Associate Professor, 医学部, 助教授 (50115515)
UEMURA Kenichi  Hamamatsu Univ. School of Medicine, Dept. of Neurosurgery, Professor, 医学部, 教授 (60009561)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1987: ¥200,000 (Direct Cost: ¥200,000)
KeywordsMedial Geniculate Body / Primary Auditory Cortex / Auditory Evoked Potentials / Extracellular Recording / 中潜時成分 / 中替時成分 / 音刺激反射
Research Abstract

1. Near field potentials which were recorded from the medial geniculate body showed large negative wave (N6) with latency, compatible with P6 (8.57 <plus-minus>0.88 msec). After making lesion in the medial geniculate body, amplitudes of P6 and N6 decreased to 65 % and 90 %, respectively. This result indicate that the medial geniculate body is mostly related to P6 wave of the far field potential
2. In the primary auditory cortex AI and AII, large negative wave (N7) was recorded with latency, compatible with P7 (11.08 <plus-minus>1.08 msec). These waves decreased to their amplitudes to 51.7 % (P7) and 39.1 % (N7) after the removal of the unilateral auditory cortex AI and AII, and to 81.7 % (P7) and 77.6 % (N7) after the bilateral removal. These date shows that the primary auditory cortex AI and AII are mostly related to P7 wave of the far field potential
3. Seventeen unit responses which showed time locked response to click stimuli were recorded from the medial geniculate body. These unit response consisted of the positive and negative waves and peak latencies of the positive and negative waves were corresponding to N7 (8.7 <plus-minus> 0.221 msec) and P7 (10.7 <plus-minus>0.1 msec), respectively. Contrary to the lesion study, unit responses showed that activities of the medial geniculate body were mostly related to P7 w
4. Fourteen unit responses which showed time locked response to click were obtained from the Primary auditory cortex AI. The respective peak latencies of positive and negative waves of unit response were 8.05 <plus-minus>0.05 msec and 10.90 <plus-minus>0.93 msec. The positive and negative waves were mostly related in latencies to N7 (8.7 ([SY.+-.[)0.1 msec) and P7 (10.71 <plus-minus> 0.66 msec), respectively. This indicate that activities of the primary auditory cortex AI are also related to P7

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Tetsuo Yokoyama,M.D.Kenichi Uemura,M.D.,M.S.: "Study of Neural Activities in the Primary Auditory Cortex; Relations to Middle Latency Auditory Evoked Potentials." Electroencepharography and Clinical Neurophysiology.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tetsu Yokoyama, M.D., Kenichi Uemura, M.D., M.S.: "Study of Neural Activities in the Primary Auditory Cortex; Relations to Middle Latency Auditory Evoked Potentials." Electroencephalography and Clinical Neurophysiology.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] TETSUO YOKOYAMA,KENICHI UEMURA: "STUDYOF NEURAL ACTIVITIES IN THE PRIMARY AUDITORY CORTEX:RELATIONS TO MIDDLE LATENCY AUDITORY EUOKED DOTENTIALS" Electroencephalography and clinical Nearophgsiology.

    • Related Report
      1989 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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