Journal
NEUROIMAGE
Volume 76, Issue 1, Pages 325-331Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2013.02.060
Keywords
Semantic integration; Information binding; Cognitive control; Anterior IFG; Posterior IFG
Funding
- Natural Science Foundation of China [NSF 31271086, NSF 31100811]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme
- Key Laboratory of Mental Health and Cognitive Science of Guangdong Province
- Research Center for Crisis Intervention and Psychological Service of Guangdong Province, South China Normal University
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Whether left inferior frontal gyrus (LIFG) activation during sentence comprehension reflects semantic integration or domain-general cognitive control remains unclear. To address this issue, 26 participants were presented with sentences word by word during fMRI scanning and were asked to perform two semantic tasks, one explicit (semantic congruency judgment) and one implicit (font size judgment). In the two language tasks, semantic integration load was parametrically manipulated with high doze, low doze and semantically violated sentences. Participants also performed a classical Stroop task during scanning. Conjunction analysis of the explicit and implicit tasks revealed two regions in left inferior frontal gyrus associated with semantic integration load: one anterior region (aIFG) and one posterior region (pIFG). However, only the pIFG region was also activated during the Stroop task. These results indicate that different regions in the LIFG play different roles in semantic integration, with aIFG more important for domain-specific processing and pIFG more important for domain-general cognitive control. (C) 2013 Elsevier Inc. All rights reserved.
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