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为研究与飞行任务相关的认知负荷对听觉事件相关电位的影响,采用14名被试者开展飞行模拟实验,完成基于不同认知负荷水平的仪表监视任务。同时,由耳机双侧呈现oddball模式下的听觉刺激,引导被试者关注飞行模拟任务,忽略听觉刺激。记录听觉事件相关电位失匹配负波(mismatch negativity,MMN)、N1和P2作为认知负荷的评价指标。实验结果表明认知负荷对额叶MMN的影响显著,MMN平均波幅在高认知负荷下显著增强,表明被试者对任务不相关信息的自动加工能力提高,且MMN平均波幅与模拟飞行期间被试者对异常信息的正确探测率正相关。提示额中央区的MMN对于与飞行任务相关的认知负荷具有较好的敏感性,并可能用于复杂飞行任务的认知负荷水平评价。但是,实验结果也表明认知负荷对早期听觉成分N1,P2以及颞叶MMN的影响不明显,在一定程度上说明了听觉事件相关电位在评价与飞行任务相关的认知负荷时所表现出的复杂效应。
In order to study the effect of cognitive load related to flight mission on the potential of auditory event, 14 subjects were used to carry out flight simulation experiments to accomplish the task of instrument monitoring based on different cognitive load levels. At the same time, auditory stimuli in the oddball mode were presented on both sides of the earphones to guide the subjects to focus on the flight simulation tasks, ignoring auditory stimuli. The auditory event-related mismatch negativity (MMN), N1, and P2 were recorded as the assessment of cognitive load. The experimental results show that cognitive load has a significant effect on frontal lobe MMN, and the mean amplitude of MMN is significantly increased under high cognitive load, indicating that the subjects’ ability to automatically process tasks irrelevant information increases, and the average amplitude of MMN is The test subjects positively correlated with the correct detection rate of abnormal information. The MMN in the hinterland is more sensitive to the cognitive load related to the mission and may be used to evaluate the cognitive load of complex missions. However, the experimental results also show that the effect of cognitive load on the early auditory components N1, P2 and the temporal lobe MMN is not obvious, to some extent shows the auditory event-related potentials in the evaluation of mission-related cognitive load Complex effect.