Cross-modal multitasking processing deficits prior to the central bottleneck revealed by event-related potentials
Cross-modal multitasking processing deficits prior to the central bottleneck revealed by event-related potentials
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DOI：
10.1016/j.neuropsychologia.2007.05.022
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发表时间：
2007-01-01
期刊：
影响因子：
2.6
通讯作者：
Jolicaeur, Pierre
中科院分区：
文献类型：
--
作者：
Brisson, Benoit;Jolicaeur, Pierre
我们使用事件相关电位（ERP）方法和70通道脑电图记录研究了在不同的心理不应期范式中，音调（T-1）的并发加工是否会干扰视觉目标（T-2）的早期感觉知觉加工。需要快速反应的T1在所有试验中都出现。在一半的试验中，T之后是双侧视觉显示T2，这也需要快速反应。单个T-1-T-2刺激开始的异步性在困难任务条件下被动态调整为任务重叠最大化，在简单任务条件下被动态调整为任务重叠最小化。在只有T的试验中，对T的ERP（未被T2污染）使我们能够从双任务T-2锁定的ERP中减去与T相关的活动。当T2需要判别性反应和检测性反应时，在困难任务条件下，相对于容易任务条件下，观察到T2锁定枕部NI的衰减。当T2需要鉴别反应时，还观察到视觉PI成分的衰减。辨别任务的并发加工也减弱了N2pc，延迟了持续后对侧负性（SPCN）。讨论了双任务干扰模型的意义。(C) 2007 Elsevier Ltd.版权所有。
We investigated whether concurrent processing of a tone (T-1) interferes with early sensory-perceptual processing of a visual target (T-2) in variants of the psychological refractory period paradigm using the event-related potential (ERP) method and 70-channel electroencephalographic recordings. T1, which required a speeded response, was presented in all trials. In half of the trials, T, was followed by a bilateral visual display, T2, which also required a speeded response. A single T-1-T-2 stimulus onset asynchrony was adjusted dynamically to maximize task overlap in a hard-Task, condition while minimizing task overlap in an easy-Task, condition. The ERP to T, in trials with only T, presented (uncontaminated by T2) enabled us to subtract T, -related activity from the dual-task T-2-locked ERPs. An attenuation of the T2-locked occipital NI was observed in the hard-Task, condition, relative to the easy-Task, condition, both when T2 required a discriminative response and a detection response. An attenuation of the visual PI component was also observed when T2 required a discriminative response. The N2pc was also attenuated, and the sustained posterior contralateral negativity (SPCN) was delayed, by concurrent processing in the discrimination task. Implications for models of dual-task interference are discussed. (C) 2007 Elsevier Ltd. All rights reserved.