Neural correlates of partial lexical activation.
Neural correlates of partial lexical activation.
复制标题
部分词汇激活的神经相关性。
DOI：
10.1073/pnas.0807054105
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发表时间：
2008
影响因子：
11.1
通讯作者：
Bavelier,Daphne
中科院分区：
文献类型：
--
作者：
Revill,KathleenPirog;Aslin,RichardN;Tanenhaus,MichaelK;Bavelier,Daphne
随着口语单词随着时间的推移展开，它会暂时与多个单词的声学形式保持一致。之前的行为研究表明，当一个单词的结尾出现暂时的模糊性时，多个候选单词会被短暂激活。在这里，我们提供了神经成像证据，表明候选词汇仅暂时与输入激活基于感知的语义表示一致。使用人工词典和新颖的视觉环境来针对人类 MT/V5 及其前面的区域，这些区域已被证明在阅读运动词时会被招募。参与者学习了涉及新物体以及物体经历的运动或颜色/纹理变化的单词。与变化事件相对应的词汇项目被组织成语音上相似的对，仅最后一个音节不同。在训练后验证任务中听到口头场景描述后，参与者在听到运动词时比听到非运动词时左半球 MT/V5 前部表现出更大的激活。重要的是，当听到一个非运动词时，MT/V5 前部的激活水平受到是否存在语音相关的运动词而不是另一个非运动词的竞争者的调节。这些结果提供了证据，证明在词汇竞争正在进行时以及在单词被完全识别之前，感知大脑区域会激活以响应单词的语义。
As a spoken word unfolds over time, it is temporarily consistent with the acoustic forms of multiple words. Previous behavioral research has shown that, in the face of temporary ambiguity about how a word will end, multiple candidate words are briefly activated. Here, we provide neural imaging evidence that lexical candidates only temporarily consistent with the input activate perceptually based semantic representations. An artificial lexicon and novel visual environment were used to target human MT/V5 and an area anterior to it which have been shown to be recruited during the reading of motion words. Participants learned words that referred to novel objects and to motion or color/texture changes that the objects underwent. The lexical items corresponding to the change events were organized into phonologically similar pairs differing only in the final syllable. Upon hearing spoken scene descriptions in a posttraining verification task, participants showed greater activation in the left hemisphere anterior extent of MT/V5 when motion words were heard than when nonmotion words were heard. Importantly, when a nonmotion word was heard, the level of activation in the anterior extent of MT/V5 was modulated by whether there was a phonologically related competitor that was a motion word rather than another nonmotion word. These results provide evidence of activation of a perceptual brain region in response to the semantics of a word while lexical competition is in process and before the word is fully recognized.