Auditory evoked magnetic fields of subjects with impaired hearing

Abstract

Event Abstract Back to Event Auditory evoked magnetic fields of subjects with impaired hearing Yuko Suzuka1*, Kanako Yamada1 and Masanori Higuchi2 1 Kanazawa Medical University, Japan 2 Kanazawa Institute of Technology, Japan Purpose: Human auditory function is examined by pure-tone audiometer generally. It reveals the hearing level and the type of impairment. And a speech discrimination test is measurement for accuracy auditory response. Both are impaired by ear diseases and brain dysfunction, which influenced by aging. We measured auditory evoked magnetic fields of subjects with impaired hearing to reveal how to correspond hearing, auditory response and speech discrimination. Method and Objectives: We examined 4 healthy volunteers and subject of hearing impairment were 6 men, age 62 to 83 years, who were all right-handed. There are moderate to severe hearing loss by audiogram, and some of them are wearing hearing aid. Speech audiograms showed 25% to 85%. They were measured by whole-head MEG system, which consist of 160 channels for 50mm base-lined co-axial gradiometers. The auditory stimuli were 1kHz and 2kHz tone burst of 50ms duration, and vowel sound /a/ and /i/ with the interstimulus interval of about 1s. Those were delivered to each ear and respectively through plastic tubes attached to earplugs. The responses were filtered with 0.1-200Hz pass band by analog filters. Results: There were many differences of amplitude of N100m by each stimuli and individuals, but less variation in latency. Some of impaired group heard inaccurately in vowel sound /a/ and /i/ as compared with tone burst. N100m by tone burst stimuli were clear in all cases including impaired group. But there were 2cases of impaired group which showed small wave in N100m by vowel stimuli. Especially one had no peak of N100m. They were related to low score in speech discrimination test. Conclusion: In auditory evoked magnetic fields with different stimuli by tone burst and vowel sound, it was revealed that MEG enhanced differences of speech discrimination between normal hearing and impaired hearing. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Sensory Processing and Functional Connectivity Citation: Suzuka Y, Yamada K and Higuchi M (2010). Auditory evoked magnetic fields of subjects with impaired hearing. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00183 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 29 Mar 2010; Published Online: 29 Mar 2010. * Correspondence: Yuko Suzuka, Kanazawa Medical University, Uchinada, Japan, suzie-nt@kanazawa-med.ac.jp Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Yuko Suzuka Kanako Yamada Masanori Higuchi Google Yuko Suzuka Kanako Yamada Masanori Higuchi Google Scholar Yuko Suzuka Kanako Yamada Masanori Higuchi PubMed Yuko Suzuka Kanako Yamada Masanori Higuchi Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.