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功能性近红外光谱(f NIRS)成像是一种新兴的光学脑成像技术。已有大量基于f NIRS简单任务脑力负荷评估方面的研究,但当实验任务从单一简单任务变化为复杂综合任务时,相应方法不能直接简单套用。借助于f NIRS技术,通过复杂任务特征分解的思路进行尝试,研究大脑皮层血氧情况随复杂任务各任务特征的变化规律,为f NIRS评估复杂任务脑力负荷等研究提供思路和基础。结果发现:前额叶大脑皮层(PFC)区域的含氧血红蛋白(Hb O)对复杂度、时间压力和有无控制三种任务特征的变化均有较高的激活程度响应;视觉皮层(VC)区域的Hb O对不同时间压力任务特征导致的任务难度变化有较高的激活程度响应,但对不同复杂度和有无控制特征的激活程度响应较低;运动皮层(MC)区域Hb O对有无控制输出特征有较高的激活程度响应,对不同时间压力特征的激活程度响应较弱。
Functional near-infrared spectroscopy (f NIRS) imaging is a novel optical brain imaging technique. There are a lot of studies on brain load assessment based on f NIRS simple tasks, but the corresponding method can not be applied directly when the experimental task changes from a single simple task to a complex and comprehensive task. By means of f NIRS technology, attempts to investigate the characteristics of cerebral cortical blood oxygen changes with the task characteristics of complex tasks are carried out by means of the idea of complex task eigendecomposition, which provides a way of thinking and a foundation for f NIRS to evaluate the mental workload of complex tasks. The results showed that the hemoglobin (HbO) in the prefrontal cortex (PFC) area had a higher activation response to changes in the complexity, time pressure and the presence or absence of control tasks. The visual cortex (VC) Hb O response to changes in task difficulty caused by pressure task characteristics at different time has a higher activation response, but has a lower response to activation with different complexity and control characteristics. The presence or absence of Hb O in the motor cortex (MC) The control output features a higher response to activation and a weaker response to the activation of pressure characteristics at different times.