Neuroscience 2005 Abstract
| Presentation Number: | 388.14 |
|---|---|
| Abstract Title: | Involvement of the orbitofrontal cortex in the cross-modal integration during lipreading--functional MRI study. |
| Authors: |
Murase, M.*1
; Saito, D. N.1
; Kochiyama, T.2
; Tanabe, H. C.1
; Tanaka, S.1
; Aramaki, Y.1
; Honda, M.1
; Sadato, N.1
1National Inst. for Physiological Sciences, Okazaki, Japan 2Japan, 38 Nishigonaka, Myodaijicho, |
| Primary Theme and Topics |
Sensory and Motor Systems - Multisensory |
| Secondary Theme and Topics | Cognition and Behavior<br />- Human Cognition, Behavior, and Anatomy<br />-- Attention |
| Session: |
388. Multisensory: Cross-Modal Processing II Poster |
| Presentation Time: | Monday, November 14, 2005 9:00 AM-10:00 AM |
| Location: | Washington Convention Center - Hall A-C, Board # M2 |
| Keywords: | AUDITORY, VISUAL |
Lipreading enhances the perception of spoken language by combining audible speech with the corresponding visible articulation movements. To evaluate the neural substrates of the cross-modal effect of the lip movement on speech identification, we underwent functional MRI on 28 normal volunteers. Tasks were the vowel identification based on the speech or lip movement. The reaction time (RT) of auditory vowel identification was 103 ms longer than that of the visual one. RT of the auditory vowel identification was shortened when the concordant lip movement was presented simultaneously, whereas elongated by discordant one. RT of the visual vowel identification was unchanged when the concordant speech was presented simultaneously, whereas elongated by discordant one. Therefore, cross-modal enhancement in the vowel identification was exerted from visual to auditory modalities, not vice versa. During auditory tasks, the orbitofrontal cortex was active only during the simultaneous presentation of the concordant lip movement. This area was inactive during visual vowel identification with or without speech. And hence the orbitofrontal cortex is related to the cross-modal integration during lipreading.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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