Neuroscience 2004 Abstract
| Presentation Number: | 752.15 |
|---|---|
| Abstract Title: | Sound localization of the vision impaired assessed by event-related potentials (ERP). |
| Authors: |
Nakamura, T.*1
; Fujii, A.1
; Tauchi, M.1
1Dept. of Welfare Syst. and Hlth. Sci., Okayama Prefectural Univ., Soja, Japan |
| Primary Theme and Topics |
Sensory Systems - Auditory -- Auditory cortex: Perception, cognition, and action |
| Session: |
752. Auditory Cortex IV Poster |
| Presentation Time: | Tuesday, October 26, 2004 3:00 PM-4:00 PM |
| Location: | San Diego Convention Center - Hall A-H, Board # T4 |
| Keywords: | ATTENTION, AUDITORY, SPATIAL ORIENTATION, BLIND |
Sound localization performance of blindfolded sighted subjects has been investigated by recording event-related potentials, ERP, and we found that some ERP components reflect the distance between two sound sources (Tauchi et al., 2003 SFN). Since some of the vision impaired persons are known to develop ability such as echolocation, it could be interesting to study their performance of sound localization. In this study, we assessed sound localization of vision impaired persons by measuring ERP and compared with that of sighted. The method used was the same as before. The white noise pulse was emitted frequently from one speaker located in front of the subject (non-target stimulation), and the same sound was emitted less frequently from another speaker located various distances from the front speaker (target stimulation). Four vision impaired persons participated; two totally blind, one early-blind and one late-blind, and two low vision, one with higher visual acuity and one lower acuity. Difference waves obtained by subtraction with non-target ERP from target ERP of sighted consist of some components such as positive wave 100ms peak latency, P1, a negative wave at 100ms-200ms, N1, a positive wave at 200ms-300ms, P2, a positive wave at 300ms-400ms, P3, and a positive wave at 450ms, P4. In vision impaired subjects, however, showed considerably different waveform i.e. P1 was not clear, N1 was small and/or delayed, P2 was small or delayed, P3 and P4 was not clear and a new component at 350ms-400ms with broader peak was observed. It was also found that a waveform of low vision with higher visual acuity was similar to that of sighted and low vision with lower acuity similar to blind. These results indicate that the visual ability has something to do with the difference in ERP components, and the difference in waveform between sighted and vision impaired may imply a certain functional difference.
Supported by Sagawa kotsu Shakai Foundation to M.T.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2004 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2004. Online.
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