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:: Volume 20, Issue 1 (27 2011) ::
aud 2011, 20(1): 82-95 Back to browse issues page
Brain activity throughout audiovisual speech perception by functional magnetic resonance imaging
Yasaman Nojaba1, Nematollah Rouhbakhsh1, Mohammad ali Oghabian2, Shohreh Jalaie3, Sina Houshmand4
1- Department of Audiology, Faculty of Rehabilitation, Tehran University of Medical Sciences, Iran
2- Department of Biophysics, Faculty of Medicine, Tehran University of Medical Sciences, Iran
3- Department of Biostatistics, Faculty of Rehabilitation, Tehran University of Medical Sciences, Iran
4- Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Abstract:   (16161 Views)

Background and Aim: Neuroimaging techniques in audiovisual speech processing are innovative approach to neuroscience investigation that steadily influences the deep survey of highly mechanisms involved in this process. The purpose of this study was to evaluate brain activity via functional magnetic resonance imaging throughout audiovisual speech perception in Persian language.
Methods: Functional MRI was used to assess 19 normal 20-30 year old women while they had been presented syllable /ka/ visually and /pa/ auditory using block design method, in which it would provide two series of imaging, functional and T1-weighted. Subsequently, the results were analyzed and compared by FSL software.
Results: The results of this study pointed out that both middle and cortical regions of brain are activated in visual stimuli and its middle regions are activated in response to auditory stimuli. Hence, left anterior supramarginal, some parts of motor speech system including insular and cingulate cortex-precentral cortex were stimulated with visual stimulus and left posterior supramarginal as well as right supramarginal gyrus were stimulated with auditory stimulus. Moreover, in this investigation, McGurk effect was behaviorally proven in fifteen subjects.
Conclusion: It was hypothesized that the activation of unique region, supramarginal gyrus, with both audio and visual stimuli indicated the presence of commonplace region for phonologic processing of sensory inputs. In addition, auditory stimuli develop more intense activity and on the other hand, broaden-maximum voxel-as well as extra regions are demonstrated in response to visual stimuli. These points represent the unfamiliarity of normal individual brain to percept visual speech stimuli.

Keywords: Functional magnetic resonance imaging, auditory speech processing, visual speech processing, McGurk effect
Full-Text [PDF 593 kb]   (3191 Downloads)    
Type of Study: Research |
Received: 2010/07/5 | Accepted: 2010/11/16 | Published: 2013/10/14
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Volume 20, Issue 1 (27 2011) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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