CAJ | 학술논문

该研究采用近红外成像技术，以30名大学生为被试，旨在验证近红外技术对于探讨反应层面冲突控制神经机制的有效性.实验过程中，要求被试按键判断计算机屏幕上出现的颜色块的颜色，包含2个实验条件：不一致条件(刺激颜色对应的按键位置和刺激出现的位置不同)和一致条件(刺激颜色对应的按键位置和刺激出现的位置相同).结果发现，不一致条件的反应时显著长于一致条件的反应时，说明被试需要更多的时间抑制冲突.此外，氧合血红蛋白浓度(HBO)的变化在刺激出现后9~12 s时达到最高值.在此时间段内对 Simon效应和 HBO在两条件之间的差异进行相关分析，发现在9~10 s时额叶左侧的 HBO差值与Simon效应有统计学意义(P<0.05)；在11~12 s时额叶左侧和额中右侧的 HBO差值也与 Simon效应有统计学意义(P<0.05).这说明额叶与个体冲突控制能力有着显著相关，验证了近红外技术对于探讨冲突控制神经机制的有效性.
해연구채용근홍외성상기술，이30명대학생위피시，지재험증근홍외기술대우탐토반응층면충돌공제신경궤제적유효성.실험과정중，요구피시안건판단계산궤병막상출현적안색괴적안색，포함2개실험조건：불일치조건(자격안색대응적안건위치화자격출현적위치불동)화일치조건(자격안색대응적안건위치화자격출현적위치상동).결과발현，불일치조건적반응시현저장우일치조건적반응시，설명피시수요경다적시간억제충돌.차외，양합혈홍단백농도(HBO)적변화재자격출현후9~12 s시체도최고치.재차시간단내대 Simon효응화 HBO재량조건지간적차이진행상관분석，발현재9~10 s시액협좌측적 HBO차치여Simon효응유통계학의의(P<0.05)；재11~12 s시액협좌측화액중우측적 HBO차치야여 Simon효응유통계학의의(P<0.05).저설명액협여개체충돌공제능력유착현저상관，험증료근홍외기술대우탐토충돌공제신경궤제적유효성.
Due to advantages of temporal and spatial resolution ratio,near-infrared spectroscopy (NIRS) can be used to explore neural mechanisms of cognitive control.Simon task is one of the most reliable measures for conflict control.Previous fMRI studies have proved that the prefrontal cortex is critical in Simon task.The current study aimed to verify effectiveness of NIRS to measure brain mechanisms of conflict control at response level.Thirty (30)college students were selected for this experiment.Participants were required to judge the color of squares on left or right side of screen by pressing left or right key.The task included two conditions, congruent condition (corresponding key position of color is in accordance with stimulus position ) and incongruent condition (corresponding key position of color is opposite to stimulus position).The behavioral data revealed that reaction time in incongruent condition was significantly longer than in congruent condition, indicating that individuals needed more time to resolve response conflict.In addition,concentration changes in oxy-hemoglobin (HBO)reached a peak 9~1 2 s after stimulus.Correlation analysis between Simon effect and HBO difference between conditions showed that HBO difference in the left frontal cortex was significantly correlated with Simon effect during 9~10 s;Moreover,a significant correlation between Simon effect and HBO differences in the left frontal and right middle frontal areas was found.Data indicated that brain activity in the prefrontal cortex was related to conflict control,verifying effectiveness of NIRS.