| Neural Network for Visuospatial Attention in Patients with Traumatic Brain Injury. |
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Kim, Yun Hee , Park, Ji Won , Ko, Myoung Hwan , Lee, Peter K W |
1Department of Physical Medicine & Rehabilitation, Samsung Medical Center & Center for Clinical Medicine, SBRI, Sungkyunkwan University School of Medicine, Korea. yunkim@smc.samsung.co.kr
2Department of Rehabilitation Medicine & Research Institute of Clinical Medicine, Chonbuk National University College of Medicine, Korea. |
| 외상성 뇌손상환자에서 주의력 장애와 관련된 뇌 신경망 변화 |
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김연희, 박지원, 고명환1, 이강우 |
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성균관대학교 의과대학 삼성서울병원 재활의학교실 및 임상의학연구센터, 1전북대학교 의과대학 재활의학교실 및 임상의학연구소 |
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| Abstract |
Purpose
To investigate the brain areas related with the deficit in visuospatial attention in patients with traumatic brain injury (TBI) using functional MRI (fMRI).
Method
Twenty TBI and fifteen normal subjects were enrolled. The endogenous visuospatial attention task was used as an activation paradigm during fMRI. FMRI was performed on a 3T ISOL Forte scanner. Thirty slices were acquired using a single-shot EPI sequences (TR/TE=3000/ 30 ms, Flip angle 70o, FOV=220 mm, 64⁓64 matrix, slice thickness 4 mm). The accuracy and reaction time to the attention task were measured during fMRI. Imaging data were analyzed using SPM-99 software.
Results
The ratio of accurate responses was lower (p＜0.01)and the average reaction time was slower (p＜0.01) in the TBI group than the normal group. The fMRI analysis showed more activation in the bilateral prefrontal cortices (the middle and inferior frontal gyri) and less activation in the cingulate gyrus, medial frontal lobe, bilateral temporo- occipital areas, and cerebellum in the TBI group compared with the normal group.
Conclusion
In TBI patients, impaired visuospatial attention might be resulted from the decreased activity of the cingulate, medial frontal, and temporo-occipital regions accompanied with compensatory hyperactivation of the prefrontal cortex. (J Korean Acad Rehab Med 2004; 28: 436-443) |
| Key Words:
Traumatic brain injury, Visuospatial attention, Functional magnetic resonance image, Prefrontal cortex |
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