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首页> 外文期刊>International journal of psychophysiology: official journal of the International Organization of Psychophysiology >Active maintenance of sentence meaning in working memory: evidence from EEG coherences.
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Active maintenance of sentence meaning in working memory: evidence from EEG coherences.

机译：积极维护工作记忆中句子的含义：EEG连贯性的证据。

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摘要

The active maintenance of sentence meaning in working memory was investigated using event-related electroencephalogram (EEG) coherences. Participants read a sentence, retained it for 2.5 s, and then verified a statement about its meaning. The sentences contained either three semantically related nouns or unrelated nouns and started either with a what phrase (WH sentences) or not (non-WH sentences), imposing either a high or low demand on verbal working memory. Comprehension accuracy showed an interaction of semantic relatedness and sentence type due to the presence of a relatedness effect (lower accuracy in the unrelated condition) in WH sentences but not in non-WH sentences. During the post-sentence retention interval, EEG coherences also displayed this interaction of relatedness and sentence type. A semantic relatedness effect was obtained in the WH sentences (high demand) but not in the non-WH sentences (low demand). In addition, compared to a pre-sentence baseline and sentence presentation, coherences increased in the 10-14 Hz band during retention and decreased in the 4-6 Hz band. These coherence changes spanned prefrontal and posterior brain regions, possibly reflecting increased synchronization in projection loops between attention control systems in prefrontal cortex and activated meaning representations in semantic memory in posterior cortex. These findings suggest that short-term retention of the meaning of a sentence involves active maintenance in a capacity-limited working memory, accompanied by a heightened inner direction of attention after sentence presentation.
机译：使用事件相关脑电图（EEG）相干性研究了工作记忆中句子含义的主动维持。参与者阅读了一个句子，将其保留了2.5 s，然后验证了有关其含义的陈述。这些句子包含三个语义相关的名词或不相关的名词，并以一个短语（WH句子）或不包含（WH句子）（非WH句子）开头，这对口头工作记忆提出了高要求或低要求。由于WH句子中存在关联效应（在不相关条件下准确性较低），因此理解准确性显示出语义相关性和句子类型之间的相互作用，而在非WH句子中则没有。在句子保留后的间隔期间，脑电图的连贯性也显示出这种关联性和句子类型的相互作用。在WH句子中（高需求）获得了语义相关性效果，但在非WH句子中（低需求）获得了语义相关性效果。此外，与句子前的基线和句子表达相比，相干性在保留期间在10-14 Hz频带中增加，而在4-6 Hz频带中减少。这些连贯性变化跨越了额叶前部和后部大脑区域，可能反映了额叶前部皮质中的注意力控制系统与后部皮质中语义记忆中激活的意义表示之间的投影循环同步性的增强。这些发现表明，句子含义的短期保留涉及在容量受限的工作记忆中的主动维护，伴随着句子表达后注意力的内在方向增强。

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