为了研究利用功能性近红外光谱（FNIRS）评估脑力负荷的可行性，综合生理参数法、绩效法及主观量表法，对12名在校大学生被试进行了图片N-back及多元归因任务(MATB)实验，分析了FNIRS参数对不同难度的敏感性及差异。N-back任务中背外侧前额叶皮层（DLPFC）1、5、9、10号通道及MATB任务中1、9号通道的FNIRS数据对脑力负荷更敏感；在0~2级难度的N-back及MATB任务中，含氧血红蛋白（HbO）和总血红蛋白（tHb）的含量随任务难度提升而增加，但在3级难度时出现降低。结果表明大脑前额叶皮层（PFC）的FNIRS信号对脑力负荷相对更敏感区域为DLPFC；在一定难度范围内，HbO和tHb的含量随任务难度的提升而增高，而当难度超过一定范围会出现下降。

To investigate the feasibility of mental workload assessment by using functional near-infrared spectroscopy (FNIRS), 12 college students are orgainzed to complete N-back and multi-attribute task battery (MATB) tasks with physiological parameter, behavioral performance and subjective scale. The sensitivity and difference of FNIRS parameters of different difficulties are analyzed. FNIRS data of the first, fifth, ninth and tenth channels in dorsolateral prefrontal cortex (DLPFC) area in N-back task and the first, ninth channels in DLPFC area during MATB task are more sensitive to mental workload. In the tasks of 0~2 level difficulty, the oxygenated hemoglobin (HbO) and total hemoglobin (tHb) show greater change as the difficulty increases and lower value change in 3 level difficulty. The results show that the FNIRS signal in DLPFC is the most sensitive area of mental workload in prefrontal cortex (PFC) area. Within a certain range of difficulty, HbO and tHb show larger change as task difficulty level increases, but the change will be opposite when task difficulty beyond a certain level.