Auditory processing processes in bilateral cochlear implant users

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K11183
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 59010:Rehabilitation science-related
• Research Institution: Nagoya University
• Principal Investigator: Yoshida Tadao 名古屋大学, 医学系研究科, 准教授 (90567017)
• Co-Investigator(Kenkyū-buntansha): 曽根 三千彦 名古屋大学, 医学系研究科, 教授 (30273238)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 人工内耳 / 聴覚検査

Outline of Final Research Achievements

In a comparison of bilateral and unilateral implantation in sequential bilateral cochlear implant surgery cases more than 6 months after implantation, SRT was better in bilateral implantation, but the first side tended to be slightly better. However, in the interactive spatial listening test, there was no difference in the direction of the noise. However, in the interactive spatial listening test, binaural hearing aid users showed better discrimination of the minimum angle. Additive and squelch effects due to binaural use were observed, but limited effects were suggested for SRM. This is a new finding that the effect of noise on hearing is important, and that an environment in which the effect of noise on the good hearing ear is minimal is better.

Free Research Field

聴覚医学、リハビリテーション

Academic Significance and Societal Importance of the Research Achievements

両耳聴効果とされる両耳加算効果、頭部遮蔽効果、両耳スケルチ、方向感などについいて人工内耳の両側装用の効果が得られる傾向にあった。新たな知見として両側人工内耳装用下では、雑音の方向を変えて比較した検査では効果が限定的である可能性が示唆された。これは人工内耳装用者の言葉の聞き取りは音の到来方向の差よりも良聴耳への雑音の有無が重要であり、ターゲット音の聞き取りには良聴耳に雑音が少ない環境が良いのではないかと考えられた。良聴耳、不良聴耳が存在する場合、リハビリテーションの方法を雑音下の聞き取りにより重点を置いた内容が必要と考えられ、今後の人工内耳リハビリテーションの取り組みに活かされると考えられた。