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Alternative TitleCognitive Mechanism of Semantic Prediction during Sentence Comprehension
Thesis Advisor李晓庆
Degree Grantor中国科学院大学
Place of Conferral中国科学院心理研究所
Degree Name理学硕士
Degree Discipline基础心理学
Keyword语义预期 预期阶段 认知机制 fMRI



Other Abstract

Top-down anticipatory processing plays an important role during language comprehension. Existing studies mainly provided indirect evidence for the existence of predictions by showing the facilitation effect of highly-predicted information. But the mechanism and neural basis of the predictive process still remain unknown.

In this study, we investigated the effect at the "anticipatory stage" and the "integration stage" respectively by separating the "critical nouns" from the "critical verbs" in front of the nouns and manipulated the contextual constraints of sentences and the semantic categories of "critical nouns". In experiment 1,we used self-paced reading task to suggest that more time is spent at the anticipatory stage in support of predictive processing in strong constraint conditions. In experiment 2, we used functional magnetic resonance imaging technique to investigate the neural mechanism of predictive processing. The results of the whole brain analysis and ROI analysis showed that in the anticipatory stage, compared with the weak constraint condition, the activation of left IFG was enhanced in the two strong constraint conditions. In the integration stage, activity in left SFG/MFG/IFG left STG/MTG bilateral occipital lobe, bilateral caudate and thalamus, was decreased in the strong constraint conditions than that in the weak constraint condition. In both stages, compared with weak constraint condition and "strong constraint-building" condition, "high constraint-tool" condition had higher activation in left ITG which is associated with tool representation. Besides, compared with weak constraint condition and "strong constraint-tool" condition, "strong constraint-building" condition had higher activation in left parahippocampal gyrus, which is related to building representation. The results of the study indicate that the specific semantic features of the expected words can be pre-activated in the strong contextual constraint conditions in the anticipatory stage, and the left IFG will participate in the predictive processing. In integration stage, integration is more easily conducted in strong constraint contexts compared with the low constraint context, indicating that the left frontal and temporal lobes, bilateral occipital lobes and some subcortical regions are involved in the integrative processing.

Document Type学位论文
Recommended Citation
GB/T 7714
邵曦明. 句子理解中语义预期加工的认知神经机制[D]. 中国科学院心理研究所. 中国科学院大学,2019.
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