Simon效应的近红外研究  

NEAR-INFRARED SPECTROSCOPY OF SIMON EFFECT

作　　者：张浩云[1] 康春燕[1] 郭桃梅[1] 

机构地区：[1]北京师范大学认知神经科学与学习国家重点实验室,北京100875

出　　处：《北京师范大学学报（自然科学版）》2014年第2期178-182,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(31170970)

摘　　要：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9～12s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9～10s时额叶左侧的HBO差值与Simon效应有统计学意义（P〈O．05）；在11～12s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〈O．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．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 9～12 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.

关 键 词：冲突控制 反应层面 SIMON效应 近红外成像技术 

分 类 号：O434.3[机械工程—光学工程]