ERP Characterization of Sustained Attention Effects in Visual Lexical Categorization
ERP Characterization of Sustained Attention Effects in Visual Lexical Categorization
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DOI：
10.1371/journal.pone.0009892
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发表时间：
2010-03-25
期刊：
影响因子：
3.7
通讯作者：
Demonet, Jean-Francois
中科院分区：
文献类型：
--
作者：
Martin, Clara D.;Thierry, Guillaume;Demonet, Jean-Francois
随着我们对阅读的基本过程的理解不断加深，注意力在这一过程中所起的关键作用变得越来越明显。在这一领域有两个特别感兴趣的研究主题：（1）持续的注意是否影响词汇判断任务尚未确定;（2）注意对早期视觉加工的影响（即，在正字法或词汇语义处理阶段之前）仍然在很大程度上未被指定。在这里，我们研究了早期知觉调制的持续注意使用的ERP范式改编自Thierry等人。[1]。参与者必须决定是否成对呈现的视觉刺激属于预先指定的类别（词汇分类集中在词或伪词对）。根据一对中第一个项目的词汇类别，参与者要么需要完全处理第二个项目（保持条件），要么可以释放他们的注意力并在没有完全处理第二个项目的情况下做出决定（释放条件）。P1峰不受持续注意力的影响。当参与者释放他们的注意力时，N1在一对中的第二个项目之后被延迟和减少。持续注意力的释放也减少了P3波引起的第一个项目对和取消P3波引起的第二个。我们的研究结果与持续注意对早期加工阶段和工作记忆的不同影响是一致的。在词汇判断任务中，持续注意在不抑制刺激整合过程的情况下调制了早期加工阶段。相反，工作记忆的参与/更新高度依赖于持续注意的分配。此外，持续注意对早期和晚期认知过程的影响与词汇分类焦点无关。
As our understanding of the basic processes underlying reading is growing, the key role played by attention in this process becomes evident. Two research topics are of particular interest in this domain: (1) it is still undetermined whether sustained attention affects lexical decision tasks; (2) the influence of attention on early visual processing (i.e., before orthographic or lexico-semantic processing stages) remains largely under-specified. Here we investigated early perceptual modulations by sustained attention using an ERP paradigm adapted from Thierry et al. [1]. Participants had to decide whether visual stimuli presented in pairs pertained to a pre-specified category (lexical categorization focus on word or pseudoword pairs). Depending on the lexical category of the first item of a pair, participants either needed to fully process the second item (hold condition) or could release their attention and make a decision without full processing of the second item (release condition). The P1 peak was unaffected by sustained attention. The N1 was delayed and reduced after the second item of a pair when participants released their attention. Release of sustained attention also reduced a P3 wave elicited by the first item of a pair and abolished the P3 wave elicited by the second. Our results are consistent with differential effects of sustained attention on early processing stages and working memory. Sustained attention modulated early processing stages during a lexical decision task without inhibiting the process of stimulus integration. On the contrary, working memory involvement/updating was highly dependent upon the allocation of sustained attention. Moreover, the influence of sustained attention on both early and late cognitive processes was independent of lexical categorization focus.