López Zunini Rocío A, Renoult Louis, Taler Vanessa
School of Psychology, University of Ottawa.
School of Psychology, University of East Anglia.
Neuropsychology. 2017 Mar;31(3):277-291. doi: 10.1037/neu0000327. Epub 2016 Nov 3.
Semantic richness is a multidimensional construct that can be defined as the amount of semantic information associated with a concept.
To investigate neurophysiological correlates of semantic richness information associated with words and its interaction with task demands.
Two different dimensions of semantic richness (number of associates and number of semantic neighbors) were investigated using event-related potentials (ERPs) in lexical decision (LDT) and semantic categorization tasks (SCT) using the same stimuli in 2 groups of participants (24 in each group).
The amplitude of the N400 ERP component, which is associated with semantic processing, was smaller for words with a high number of associates (p = .003 at fronto-centro-parietal sites) or semantic neighbors (p < .03 at centro-parietal sites) than for words with a low number of associates or number of semantic neighbors, in the LDT but not the SCT.
These results suggest that the effects of semantic richness vary with task demands and may be used in a top-down manner to accommodate the current context. (PsycINFO Database Record
语义丰富度是一个多维结构，可定义为与一个概念相关的语义信息量。
研究与单词相关的语义丰富度信息的神经生理相关性及其与任务需求的相互作用。
在两组参与者（每组24人）中，使用事件相关电位（ERP）在词汇判断任务（LDT）和语义分类任务（SCT）中，对语义丰富度的两个不同维度（联想词数量和语义邻域数量）进行研究，两组任务使用相同的刺激。
在词汇判断任务中，与语义处理相关的N400 ERP成分的波幅，对于联想词数量多（额中央顶叶部位p = 0.003）或语义邻域数量多（中央顶叶部位p < 0.03）的单词，比联想词数量少或语义邻域数量少的单词小，但在语义分类任务中并非如此。
这些结果表明，语义丰富度的影响随任务需求而变化，并且可能以自上而下的方式用于适应当前情境。（PsycINFO数据库记录）
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