The rapid distraction of attentional resources toward the source of incongruent stimulus input during multisensory conflict.
The rapid distraction of attentional resources toward the source of incongruent stimulus input during multisensory conflict.
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DOI：
10.1162/jocn_a_00336
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发表时间：
2013-04
影响因子：
3.2
通讯作者：
Woldorff MG
中科院分区：
文献类型：
--
作者：
Donohue SE;Todisco AE;Woldorff MG
多感觉冲突的神经影像学研究表明，在面对不一致时，相关的模态会得到增强的处理。然而，在不相关的方式和相关或不相关的方式的注意调制的时间级联的刺激处理的程度是未知的。在这里，我们采用了视听冲突范式与感官探针在任务无关的方式（视觉）来衡量注意分配到该方式。事件相关电位（ERP）被记录为主题出席和歧视口头听觉字母，而忽略同时双边视觉字母刺激，无论是完全一致，完全不一致，或部分不一致（一侧不一致，一个一致）的听觉刺激。一半的视听字母刺激500-700毫秒后，由双边视觉探针刺激。视听刺激的ERP表现出不一致性效应（完全不一致与完全一致）的增强，集中分布，负极性波开始~250 ms。更关键的是，感觉ERP组件的视觉探头更大时，他们遵循完全不一致与完全一致的多感官刺激，这些增强在具有最慢响应时间的完全不一致试验上最大。此外，在反应最慢的部分不一致试验中，视觉探针的P2感觉成分比前一个不一致视觉刺激的对侧更大。这些数据表明，在应对冲突的多感官刺激输入，最初的认知效果是捕获的注意力不一致的无关模态输入，拉向该模态的神经处理资源，导致快速增强，而不是快速抑制，该输入。
Neuroimaging work on multisensory conflict suggests that the relevant modality receives enhanced processing in the face of incongruency. However, the degree of stimulus processing in the irrelevant modality and the temporal cascade of the attentional modulations in either the relevant or irrelevant modalities are unknown. Here, we employed an audiovisual conflict paradigm with a sensory probe in the task-irrelevant modality (vision) to gauge the attentional allocation to that modality. Event-related potentials (ERPs) were recorded as subjects attended to and discriminated spoken auditory letters while ignoring simultaneous bilateral visual letter stimuli that were either fully congruent, fully incongruent, or partially incongruent (one side incongruent, one congruent) with the auditory stimulation. Half of the audiovisual letter stimuli were followed 500-700 ms later by a bilateral visual probe stimulus. As expected, ERPs to the audiovisual stimuli showed an incongruency ERP effect (fully incongruent versus fully congruent) of an enhanced, centrally distributed, negative-polarity wave starting ~250 ms. More critically here, the sensory ERP components to the visual probes were larger when they followed fully incongruent versus fully congruent multisensory stimuli, with these enhancements greatest on fully incongruent trials with the slowest response times. In addition, on the slowest-response partially incongruent trials, the P2 sensory component to the visual probes was larger contralateral to the preceding incongruent visual stimulus. These data suggest that, in response to conflicting multisensory stimulus input, the initial cognitive effect is a capture of attention by the incongruent irrelevant-modality input, pulling neural processing resources toward that modality, resulting in rapid enhancement, rather than rapid suppression, of that input.
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