Distinct roles for the anterior temporal lobe and angular gyrus in the spatiotemporal cortical semantic network. (30th January 2022)

• Record Type: Journal Article
• Authors: Farahibozorg, Seyedeh-Rezvan; Henson, Richard N; Woollams, Anna M; Hauk, Olaf
• Is Part Of: Cerebral cortex. Volume 32:Number 20(2022)
• Page Start: 4549
• Page End: 4564
• Publication Date: 2022-01-30
• Subjects: connectivity modeling -- dynamic causal modeling -- EEG/MEG source estimation -- semantic network -- spatiotemporal dynamics; Cerebral cortex -- Periodicals; Brain -- Periodicals; 612.825
• DOI: 10.1093/cercor/bhab501
• Languages: English
• ISSNs: 1047-3211

Abstract

Abstract: Semantic knowledge is supported by numerous brain regions, but the spatiotemporal configuration of the network that links these areas remains an open question. The hub-and-spokes model posits that a central semantic hub coordinates this network. In this study, we explored distinct aspects that define a semantic hub, as reflected in the spatiotemporal modulation of neural activity and connectivity by semantic variables, from the earliest stages of semantic processing. We used source-reconstructed electro/magnetoencephalography, and investigated the concreteness contrast across three tasks. In a whole-cortex analysis, the left anterior temporal lobe (ATL) was the only area that showed modulation of evoked brain activity from 100 ms post-stimulus. Furthermore, using Dynamic Causal Modeling of the evoked responses, we investigated effective connectivity amongst the candidate semantic hub regions, that is, left ATL, supramarginal/angular gyrus (SMG/AG), middle temporal gyrus, and inferior frontal gyrus. We found that models with a single semantic hub showed the highest Bayesian evidence, and the hub region was found to change from ATL (within 250 ms) to SMG/AG (within 450 ms) over time. Our results support a single semantic hub view, with ATL showing sustained modulation of neural activity by semantics, and both ATL and AG underlying connectivity depending on the stage of semantic processing.