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首页> 外文期刊>Cerebral cortex >Heterogeneity of the left temporal lobe in semantic representation and control: priming multiple versus single meanings of ambiguous words.
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Heterogeneity of the left temporal lobe in semantic representation and control: priming multiple versus single meanings of ambiguous words.

机译：左颞叶在语义表示和控制中的异质性：引发歧义词的多重和单一含义。

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摘要

Semantic judgments involve both representations of meaning plus executive mechanisms that guide knowledge retrieval in a task-appropriate way. These 2 components of semantic cognition-representation and control-are commonly linked to left temporal and prefrontal cortex, respectively. This simple proposal, however, remains contentious because in most functional neuroimaging studies to date, the number of concepts being activated and the involvement of executive processes during retrieval are confounded. Using functional magnetic resonance imaging, we examined a task in which semantic representation and control demands were dissociable. Words with multiple meanings like "bank" served as targets in a double-prime paradigm, in which multiple meaning activation and maximal executive demands loaded onto different priming conditions. Anterior inferior temporal gyrus (ITG) was sensitive to the number of meanings that were retrieved, suggesting a role for this region in semantic representation, while posterior middle temporal gyrus (pMTG) and inferior frontal cortex showed greater activation in conditions that maximized executive demands. These results support a functional dissociation between left ITG and pMTG, consistent with a revised neural organization in which left prefrontal and posterior temporal areas work together to underpin aspects of semantic control.
机译：语义判断既包含含义的表示形式，又包含执行机制，以适合任务的方式指导知识的检索。语义认知表示和控制的这两个部分通常分别链接到左颞皮层和前额叶皮层。但是，这个简单的建议仍然引起争议，因为迄今为止，在大多数功能性神经影像学研究中，被激活的概念数量和检索过程中执行过程的参与都被混淆了。使用功能磁共振成像，我们检查了一项任务，其中语义表示和控制需求是可分离的。具有双重含义的单词（例如“ bank”）在双重素词范式中充当目标，在多重典范范式中，多重含义激活和最大执行要求被加载到不同的引发条件上。前颞下回（ITG）对检索到的含义数量敏感，表明该区域在语义表示中发挥作用，而后颞上回（pMTG）和额下皮层在最大化执行需求的条件下表现出更大的激活性。这些结果支持左ITG和pMTG之间的功能分离，这与修订后的神经组织一致，在该组织中，左前额叶和后颞区共同起作用，以支持语义控制的各个方面。

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