Neural correlates of implicit and explicit combinatorial semantic processing.
Neural correlates of implicit and explicit combinatorial semantic processing.
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DOI：
10.1016/j.neuroimage.2010.06.055
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发表时间：
2010-11-01
期刊：
影响因子：
5.7
通讯作者：
Seidenberg, Mark S.
中科院分区：
文献类型：
--
作者：
Graves, William W.;Binder, Jeffrey R.;Desai, Rutvik H.;Conant, Lisa L.;Seidenberg, Mark S.
语言是由一系列的单词组成的，但是理解短语不仅仅涉及连接的含义：船屋是船只的避难所，而避暑别墅是夏天使用的房子，而鬼屋通常是无人居住的。人们对组合语义过程的大脑基础知之甚少。我们进行了两个fMRI实验，使用熟悉的，高度有意义的短语（湖屋）和不熟悉的短语，通过颠倒熟悉项目的词序（房子湖）创建的最小意义。第一个实验使用1-back匹配任务来评估内隐语义加工，第二个实验使用分类任务来进行外显语义加工。这些条件要求对相同的词进行处理，但在有意义的条件下进行更有效的组合处理。有意义的短语与反向短语的对比显示，激活主要是在分类任务期间，在更大程度上在右半球，包括右角回，背内侧前额叶皮层，和双边后扣带/楔前叶，以前涉及语义处理的领域。正相关的fMRI信号与词汇（字级）频率发生专门与1-回任务，并在更大的空间范围内的左侧，包括左后颞中回和双侧海马旁。这些结果揭示了强烈的影响，任务要求的词汇与组合处理的参与，并建议这些水平的语义表征之间的半球分离。
Language consists of sequences of words, but comprehending phrases involves more than concatenating meanings: A boat house is a shelter for boats, whereas a summer house is a house used during summer, and a ghost house is typically uninhabited. Little is known about the brain bases of combinatorial semantic processes. We performed two fMRI experiments using familiar, highly meaningful phrases (LAKE HOUSE) and unfamiliar phrases with minimal meaning created by reversing the word order of the familiar items (HOUSE LAKE). The first experiment used a 1-back matching task to assess implicit semantic processing, and the second used a classification task to engage explicit semantic processing. These conditions required processing of the same words, but with more effective combinatorial processing in the meaningful condition. The contrast of meaningful versus reversed phrases revealed activation primarily during the classification task, to a greater extent in the right hemisphere, including right angular gyrus, dorsomedial prefrontal cortex, and bilateral posterior cingulate/precuneus, areas previously implicated in semantic processing. Positive correlations of fMRI signal with lexical (word-level) frequency occurred exclusively with the 1-back task and to a greater spatial extent on the left, including left posterior middle temporal gyrus and bilateral parahippocampus. These results reveal strong effects of task demands on engagement of lexical versus combinatorial processing and suggest a hemispheric dissociation between these levels of semantic representation.
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影响因子：
3.2
作者：
Binder, JR;Westbury, CF;Medler, DA
通讯作者：
Medler, DA
DOI：
10.1037/0278-7393.27.1.236
发表时间：
2001-01-01
影响因子：
2.6
作者：
Gagné, CL
通讯作者：
Gagné, CL
影响因子：
3.3
作者：
FORMAN, SD;COHEN, JD;NOLL, DC
通讯作者：
NOLL, DC
影响因子：
4.8
作者：
Derrfuss, J;Brass, M;von Cramon, DY
通讯作者：
von Cramon, DY
影响因子：
2.5
作者：
Costello, FJ;Keane, MT
通讯作者：
Keane, MT