CAJ | 학술논문

目的：在认知功能研究中，与认知有很大关系的 theta（4~12 Hz）节律的能量分析受到很多关注，该仿真研究了一个脑区 theta 能量与组织电特性的关系以深入了解 theta 能量所表达的物理意义。方法文章利用了 COMSOL Multiphysics（FEMLAB）所提供的有限元方法（ finite element method，FEM）仿真了正弦振荡（4~8 Hz）的偶极子电流所形成的场电位（ field potential，FP），分析了 theta 能量随导电媒质电导率特性变化的规律。结果（1）Theta 能量可随电导率的增大而减小，但随着各向异性的增强却没有下降。（2）与各向同性媒质对照，各向异性媒质的能量有变大可能。（3）偶极子电流的振幅和频率都对 theta 能量有影响。结论 Theta 能量与导电媒质的特性和偶极子电流的特性均有关。
목적：재인지공능연구중，여인지유흔대관계적 theta（4~12 Hz）절률적능량분석수도흔다관주，해방진연구료일개뇌구 theta 능량여조직전특성적관계이심입료해 theta 능량소표체적물리의의。방법문장이용료 COMSOL Multiphysics（FEMLAB）소제공적유한원방법（ finite element method，FEM）방진료정현진탕（4~8 Hz）적우겁자전류소형성적장전위（ field potential，FP），분석료 theta 능량수도전매질전도솔특성변화적규률。결과（1）Theta 능량가수전도솔적증대이감소，단수착각향이성적증강각몰유하강。（2）여각향동성매질대조，각향이성매질적능량유변대가능。（3）우겁자전류적진폭화빈솔도대 theta 능량유영향。결론 Theta 능량여도전매질적특성화우겁자전류적특성균유관。
Objective As the central in cognitive functions,the power of theta rhythms( 4—12 Hz) received more attention. Here,the relationship between theta power and electrical features was investigated in order to know more about the physical meaning of theta power. Methods By using the method of finite element method(FEM)in COMSOL Multiphysics(FEMLAB),the field potentials(FP),derived from the oscillatory dipole currents(4-8 Hz),were computed in different conducting medium,and then theta power values of FP were calculated. Results(1)Theta power was decreased with the increase of electrical conductivity,however not decreased with the enhanced anisotropy. (2)It was possible that the level of theta power in anisotropic medium might be greater than that in isotropic medium. (3)Theta power was affected by both the amplitude and the frequency of dipole current. Conclusions Theta power was related to both the conducting medium and the activity of dipole current.