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1994 Fiscal Year Final Research Report Summary

Auditory Plasticity in Cochlear Implant Animal Model

Research Project

Project/Area Number 05671428
Research Category

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

Allocation TypeSingle-year Grants
Research Field Otorhinolaryngology
Research InstitutionOSAKA UNIVERSITY

Principal Investigator

KUBO Takeshi  MEDICAL SCHOOL,OTOLARYNGOLOGY,PROFESSOR, 医学部, 教授 (30107031)

Co-Investigator(Kenkyū-buntansha) DOI Katsumi  MEDICAL SCHOOL,OTOLARYNGOLOGY,ASSOCIATE PROFESSOR, 医学部, 講師 (40243224)
Project Period (FY) 1993 – 1994
KeywordsCOCHLEAR IMPLANT / ANIMAL MODEL / AUDITION / PLASTICITY / FOS / NEUROTRANSMITTER / ELECTRIC STIMUTALTION
Research Abstract

It was not known that each Cochlear Implant (Cl) patients can obtain how much speech discrimination ability prior to the operation. This study aimed to find the useful method in order to predict speech discrimination ability (auditory plasticity) in using Cl animal model and also with the patients.
I.Auditory plasticity in Cl animal model : The electrodes were inserted in the cochlea of neonatally deafended rats (Cl animal model). Electricaly driven auditory brainstem response (EABR) was compared between Cl model and control rats. The threshold of EABR showed no difference, but the ampltitude growth curve relative to the stimulus intensity showed significant difference ; the steepness was smaller in animal model. This indicated that the number of auditory nerve fibers evoked by the electric stimulation was smaller in deafended animal than the controls. As the steepness of amplitude growth curve reflected the extent of surviving auditory nerve, it became a good indicator for post-operative speech discrimination ability. The brainstem was examined for the appearance of Fos protein following the electric stimulation in the cochlea. As the dorsal conchlear nucleus contained large number of Fos positive neurons, this region was thought to be one of the important site for electrically driven auditory sensation.
II.Auditory plasticity in Cl patients : Speech discrimination scores and the electrophysiological parameters were studied for over a year in Cl patients. The results revealed positive change in each parameters. Thus, auditory plasticity was also proved in Cl patients.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 久保武: "難聴の治療法" 臨床科学. 30. 626-628 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宇野敦彦、山本好一、井脇貴子、大草方子、土井勝美、久保 武: "人工内耳埋め込み術後患者のEABR" Audiology Japan. 38. 533-534 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤井和敏、雑賀孝昇、山本好一、宇野敦彦、土井勝美、久保 武: "人工内耳動物モデルのEABR" Audiology Japan. 38. 539-540 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡辺雄介、三浦一朗、久保 武: "人工内耳患者による語のアクセントとタイミングの識別" 音声言語. 5. 39-48 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 久保武、角実枝子、井脇貴子、大草方子、高橋佳文、渡辺雄介: "残聴を有する例への人工内耳手術の適応" 耳鼻臨床. (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kubo T,Iwaki T,Ohkusa M,Doi K,Yamamoto K,Fujii K: "Auditory plasticity in cochlear implant patients" Acta Otolaryngol. 116(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morita M,Kubo T,Iseki Y,Yamakawa J,Watanabe Y.: "Analysis of equilibrium function in cochlear implant patients." Equilibrium Res. 54-3. 307-311 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kubo T,Sumi M,Iwaki, T,Ohkusa M,Takahashi Y,Watanabe Y.: "Cochlear implants in cases with residual hearing." Prac Otol (Kyoto). (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kubo T,Iwaki T,Ohkusa M,Doi K,Yamamoto K,Fujii K.: "Auditory plasticity in cochlear implant patients." Acta Otolarynogol (Stockh). 116 (in press). (1996)

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

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Published: 1999-03-09  

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