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Journal of the Korean Academy of Rehabilitation Medicine 2000;24(4):594-602.
Brain Language Network and Lateralization Using for Spoken and Written Korean Words in Normal Adults: A Functional MRI Study.
Kim, Yun Hee , Kim, Seong Yong , Lee, Jung Chung , Kim, Hyoung Ihl , Hong, In Ki , Parrish, Todd B , Seo, Jeong Hwan , Kim, Hyun Gi
1Department of Rehabilitation Medicine, Chonbuk University Medical School, Chounju.
2Department of Neurosurgery, Chonbuk University Medical School, Chounju.
3Epilepsy Surgery Program, Honam Medical Center.
4Department of Information and Communications, Kwangju Institute of Science and Technology, Kwangju.
5Department of Radiology, Northwestern University Medical School, Chicago, USA.
6Faculty of European Language and Literature, College of Humanities, Chonbuk National University, Chonju.
언어 자극의 종류에 따른 뇌 신경망 및 편측화 기능적 뇌 자기공명영상 연구
김연희1, 김성용1, 이정청2, 김형일3, 홍인기4, Todd B. Parrish5, 서정환1, 김현기6
전북대학교 의과대학 1재활의학교실, 2신경외과학교실, 3호남병원 간질수술팀, 4광주과학기술원 정보 및 통신공학과, 5Department of Radiology, Northwestern University Medical School, 6전북대학교 인문과학대학 유럽어문학부
Abstract

Objective
This study involves an experiment using functional magnetic resonance imaging (fMRI) to delineate neural network and laterality of language related brain activation for spoken and written Korean words in normal adults.


Method
Eight normal right-handed Korean males, aged 20∼33 years, were investigated. Language tasks consisted of auditory and visual verb generation tasks. In fMRI, twenty slices were obtained for each functional volume using single shot echoplanar image sequences. Data were motion corrected, coregistered, normalized, and statistically analyzed using SPM-96 software. The number of activated voxels were counted in each hemisphere to calculate the laterality index according to each language task.


Results
In auditory verb generation task, inferior frontal gyrus and superior temporal region were activated in the left side. Right temporal lobe was also activated in the superior and middle temporal areas. Other activated area included medial frontal lobe. Lateralization index of auditory verb generation task was ⁢78.6⁑30.7. In visual verb generation task, inferior frontal gyrus was activated in the left side. Medial frontal lobe, both lateral occipital lobe, and left parietal lobe were also activated. The laterality index was ⁢87.6⁑10.1.


Conclusion
We could delineate cortical regions subserved for spoken and written Korean language and laterality of language related brain activation using fMRI. These results can contribute to understand underlying mechanism of language disorders in brain injury patients and to investigate the pattern of reorganization of language network after rehabilitation.

Key Words: Functional MRI, Brain language network, Laterality index
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