Auditory context effects in picture naming investigated with event-related fMRI
Auditory context effects in picture naming investigated with event-related fMRI
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DOI：
10.3758/cabn.9.3.260
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发表时间：
2009-09-01
影响因子：
2.9
通讯作者：
McMahon, Katie L.
中科院分区：
文献类型：
--
作者：
de Zubicaray, Greig I.;McMahon, Katie L.
宾语的加工过程包括提取目标词汇概念和编码语音词形。我们在fMRI实验中使用图片-单词干扰任务调查了这些阶段。参与者命名的目标图片中存在的语义相关，语音相关，或无关的干扰词或孤立。我们观察到BOLD信号的变化与词汇概念和语音处理的左半球地区，包括中后部外侧颞叶皮层。然而，这些BOLD反应表现为信号减少相对于单独命名的所有干扰条件。与无关的话相比，语音相关的干扰显示进一步的信号减少，而只有左下额叶皮层的眶部显示出选择性减少的语义条件下的反应。我们解释这些研究结果表明，词汇竞争对手的词的形式是语音编码和词汇选择过程中的竞争减少了语音相关的干扰。由于听觉呈现的扩展性质需要一个词的很大一部分被提出之前，其含义是访问，我们属性的BOLD信号减少观察到的语义相关和不相关的单词进行侧抑制机制后，目标名称的选择已经发生，已经提出了一些生产模型。
Naming an object entails a number of processing stages, including retrieval of a target lexical concept and encoding of its phonological word form. We investigated these stages using the picture-word interference task in an fMRI experiment. Participants named target pictures in the presence of auditorily presented semantically related, phonologically related, or unrelated distractor words or in isolation. We observed BOLD signal changes in left-hemisphere regions associated with lexical-conceptual and phonological processing, including the mid-to-posterior lateral temporal cortex. However, these BOLD responses manifested as signal reductions for all distractor conditions relative to naming alone. Compared with unrelated words, phonologically related distractors showed further signal reductions, whereas only the pars orbitalis of the left inferior frontal cortex showed a selective reduction in response in the semantic condition. We interpret these findings as indicating that the word forms of lexical competitors are phonologically encoded and that competition during lexical selection is reduced by phonologically related distractors. Since the extended nature of auditory presentation requires a large portion of a word to be presented before its meaning is accessed, we attribute the BOLD signal reductions observed for semantically related and unrelated words to lateral inhibition mechanisms engaged after target name selection has occurred, as has been proposed in some production models.