Brain Activation during Masked and Unmasked Semantic Priming: Commonalities and Differences
Brain Activation during Masked and Unmasked Semantic Priming: Commonalities and Differences
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掩蔽和非掩蔽语义启动过程中的大脑激活：共同点和差异
DOI：
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发表时间：
2013
影响因子：
3.2
通讯作者：
M. Kiefer
中科院分区：
文献类型：
--
作者：
Martin Ulrich;K. Hoenig;G. Grön;M. Kiefer
使用功能磁共振成像在词汇决策任务中，我们调查了语义启动的神经相关性下掩蔽和未掩蔽的启动呈现条件下，在同一组的24名参与者（14名妇女）的重复测量设计。任务是区分假词和单词。被掩蔽和未掩蔽的启动词与目标刺激的语义相关程度不同。启动的神经相关被定义为语义无关减去相关试验后显着不同的神经激活。左侧梭状回，左后额下回，和双边前SMA表现出独立的掩蔽条件启动效应。相比之下，双侧上级颞回，上级顶叶小叶，和SMA适当的表现出更大的神经启动相比，在未掩蔽的条件。倒置对比（掩蔽启动减去未掩蔽启动）即使在降低的显著性阈值下也未显示出显著差异。在左梭状回启动的联合效应表明其参与语义记忆的神经组织的直接后果。在暴露条件下，大脑区域的活动显示出明显更多的神经启动，这可能反映了参与者对启动-目标关系的评估，可能是在语义匹配的背景下。因此，本研究结果表明，掩蔽和非掩蔽语义启动部分依赖于解离机制在神经和最有可能也在功能水平。
Using fMRI during a lexical decision task, we investigated the neural correlates of semantic priming under masked and unmasked prime presentation conditions in a repeated measurement design of the same group of 24 participants (14 women). The task was to discriminate between pseudowords and words. Masked and unmasked prime words differed in their degree of semantic relatedness with target stimuli. Neural correlates of priming were defined as significantly different neural activations upon semantically unrelated minus related trials. Left fusiform gyrus, left posterior inferior frontal gyrus, and bilateral pre-SMA showed priming effects independent of the masking condition. By contrast, bilateral superior temporal gyri, superior parietal lobules, and the SMA proper demonstrated greater neural priming in the unmasked compared with the masked condition. The inverted contrast (masked priming minus unmasked priming) did not show significant differences even at lowered thresholds of significance. The conjoint effects of priming in the left fusiform gyrus suggest its involvement as a direct consequence of the neural organization of semantic memory. Activity in brain regions showing significantly more neural priming in the unmasked condition possibly reflected participants' evaluation of the prime–target relationship, presumably in the context of semantic matching. The present results therefore indicate that masked and unmasked semantic priming partially depend on dissociable mechanisms at the neural and most likely also at the functional level.
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DOI：
10.1073/pnas.94.26.14792
发表时间：
1997-12-23
影响因子：
11.1
作者：
Thompson-Schill, SL;D'Esposito, M;Farah, MJ
通讯作者：
Farah, MJ
分离中颞皮层中与动作和声音相关的概念的表征
影响因子：
2.5
作者：
Kiefer;Trumpp;Herrnberger;Hoenig;Pulvermüller
通讯作者：
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灵活建立功能性大脑网络支持无意识认知的注意力调节
影响因子：
4.8
作者：
Ulrich;Kiefer
通讯作者：
Kiefer
影响因子：
3.6
作者：
Natalie M. Trumpp;Daniel Kliese;K. Hoenig;T. Haarmeier;M. Kiefer
通讯作者：
Natalie M. Trumpp;Daniel Kliese;K. Hoenig;T. Haarmeier;M. Kiefer
DOI：
10.1073/pnas.95.3.914
发表时间：
1998-02-03
影响因子：
11.1
作者：
Fiez, JA;Petersen, SE
通讯作者：
Petersen, SE