Ries Anthony J, Touryan Jon, Ahrens Barry, Connolly Patrick
Human Research and Engineering Directorate, U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland, United States of America.
College of Engineering and Computing, Nova Southeastern University, Fort Lauderdale, Florida, United States of America.
PLoS One. 2016 Jun 10;11(6):e0157260. doi: 10.1371/journal.pone.0157260. eCollection 2016.
Recording synchronous data from EEG and eye-tracking provides a unique methodological approach for measuring the sensory and cognitive processes of overt visual search. Using this approach we obtained fixation related potentials (FRPs) during a guided visual search task specifically focusing on the lambda and P3 components. An outstanding question is whether the lambda and P3 FRP components are influenced by concurrent task demands. We addressed this question by obtaining simultaneous eye-movement and electroencephalographic (EEG) measures during a guided visual search task while parametrically modulating working memory load using an auditory N-back task. Participants performed the guided search task alone, while ignoring binaurally presented digits, or while using the auditory information in a 0, 1, or 2-back task. The results showed increased reaction time and decreased accuracy in both the visual search and N-back tasks as a function of auditory load. Moreover, high auditory task demands increased the P3 but not the lambda latency while the amplitude of both lambda and P3 was reduced during high auditory task demands. The results show that both early and late stages of visual processing indexed by FRPs are significantly affected by concurrent task demands imposed by auditory working memory.
记录脑电图（EEG）和眼动追踪的同步数据，为测量显性视觉搜索的感觉和认知过程提供了一种独特的方法。使用这种方法，我们在一个专门关注λ波和P3成分的引导式视觉搜索任务中获得了注视相关电位（FRP）。一个突出的问题是，λ波和P3 FRP成分是否会受到并发任务需求的影响。我们通过在引导式视觉搜索任务期间同时获取眼动和脑电图（EEG）测量数据来解决这个问题，同时使用听觉n-back任务对工作记忆负荷进行参数调制。参与者单独执行引导式搜索任务，同时忽略双耳呈现的数字，或者在0、1或2-back任务中使用听觉信息。结果表明，视觉搜索和n-back任务中的反应时间增加，准确性降低，这是听觉负荷的函数。此外，高听觉任务需求增加了P3波的潜伏期，但没有增加λ波的潜伏期，而在高听觉任务需求期间，λ波和P3波的振幅都降低了。结果表明，由FRP索引的视觉处理的早期和晚期阶段都受到听觉工作记忆施加的并发任务需求的显著影响。
