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김지혜 ( Ji-hye Kim ),이한솔 ( Hansol Lee ),김소연 ( So-yeun Kim ),장성호 ( Sung Ho Jang ),장용민 ( Yongmin Chang ),최연희 ( Youn-hee Choi ) 대한예방치과·구강보건학회 2023 大韓口腔保健學會誌 Vol.47 No.4
Objectives: The aim of this study was to evaluate brain activity in youth during chewing gum and wood stick using functional magnetic resonance imaging (fMRI). Methods: Two participants chewed wax gums and wood stick on the rhythm of 1 Hz during MRI scanning. The task paradigm was a block design and each chewing-rest procedure was repeated five times for 30s. Results: The brain regions activated during chewing gum and wood stick were the precentral gyrus, postcentral gyrus, supplementary motor area, thalamus cerebellum. The medial prefrontal cortex (mPFC), anterior cingulate cortex (ACC), hippocampus, and precuneus were additionally activated by mastication of the wood stick. Brain activation induced by chewing wood stick was higher than chewing gum. Conclusions: Our results suggest that mastication contribute to cognitive improvement through brain activity, this effect is stronger during chewing wood than gum. Therefore, eating harder foods may improve cognitive function more effectively.
뇌졸중환자에서 뇌지도화를 통해 증명된 동측 운동신경 경로
장성호,한봉수,장용민,변우목,이지인,이호 한국뇌학회 2001 한국뇌학회지 Vol.1 No.2
목적: 뇌졸중환자에서 fMRI와 TMS를 이용하여 수부의 운동신경기능에 대한 뇌지도화를 시행하여 운동신경기능 회복 기전에 대하여 연구하고자 하였다. 방법: 40세 여자 환자로 우측 심부 백질 경색으로 인한 좌측 편마비환자이었다. 기능적 자기공명영상은 1.5T MR scanner로 Blood Oxygen Level-Dependent(BOLD) 기법을 적용하였다. 운동 과제는 손가락을 1∼2 Hz의 주기로 쥐었다 펴기를 반복하였다. TMS는 원형코일의 앞쪽 부위를 1.0 cm 간격으로 자극하여 양측 단무지외전근에서 운동유발전위를 얻었다. 결과: FMRI를 시행한 결과 건측인 우측 수부운동 시 좌측 일차 감각운동피질(SM1)이 활성화되었다. 환측인 좌측 수부운동 시에는 양측 SM1이 활성화되었다. TMS를 이용한 뇌지도화에서는 건측인 좌측 대뇌 피질로부터 환측인 좌측 상지로 가는 동측 운동유발전위가 유발되었다. 동측 운동유발전위는 좌측 대뇌 피질을 자극하여 우측 단무지외전근에서 유발된 운동유발전위에 비하여 잠시가 지연되어 있고 전위가 감소되어 있었다. 결론: FMRI와 TMS를 이용한 뇌지도화를 통하여 건측 대뇌피질로부터 환측 상지로의 동측 운동신경 경로에 의하여 운동신경기능 회복이 되었으며 이 동측 운동신경 경로는 비피질척수로에서 기인된 것으로 추정할 수 있었다. Objective: This study investigated the mechanism of motor recovery using both functional Magnetic Resonance Imaging(fMRI) and Transcranial Magnetic Stimulation(TMS) in a left hemiplegic patient with infarction on the right deep white matter. Method: FMRI was performed using blood oxygen level-dependent(BOLD) technique at 1.5 T with a standard head coil. The motor activation task consisted of finger flexion-extension exercises in 1-2 Hz cycles. TMS was carried out using a round coil. The anterior portion of the coil was moved over different scalp positions 1.0 cm apart. Motor evoked potential(MEP) from both abductor pollicis brevis(APB) muscle was obtained simultaneously Results: FMRI showed that the left primary sensorimotor cortex(SM1) was activated with the right hand movements. On the other hand, the bilateral SM1 were activated with the left hand movements. Brain mapping using TMS revealed that ipsilateral MEPs were obtained at the left APB muscle. Ipsilateral MEPs of left APB muscle showed delayed latency and lower amplitude compared to that of right APB muscle when stimulated at the left motor cortex. Conclusions: We concluded that ipsilateral motor pathway from undamaged motor cortex seemed to contribute to the motor recovery in this patient. The ipsilateral motor pathway was considered to be originated from non-corticospinal tract by its configuration.