Journal
CEREBRAL CORTEX
Volume 30, Issue 11, Pages 6051-6068Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhaa178
Keywords
EEG; embodied cognition; functional connectivity; intracranial recordings; semantic processing
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Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas
- Fondo para la Investigacion Cientifica y Tecnologica [PICT 2017-1818, 2017-1820]
- Comision Nacional de Investigacion Cientifica y Tecnologica (FONDECYT Regular) [1170010]
- Fondo de Financiamiento de Centros de Investigacion en Areas Prioritarias [15150012]
- Programa Interdisciplinario de Investigacion Experimental en Comunicacion y Cognicion (PIIECC), Facultad de Humanidades, USACH
- Global Brain Health Institute [GBHI ALZ UK-20-639295]
- National Institutes of Aging of the National Institutes of Health [R01AG057234]
- Alzheimer's Association [SG-20-725707-ReDLat]
- Rainwater Foundation
- Global Brain Health Institute
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In construing meaning, the brain recruits multimodal (conceptual) systems and embodied (modality-specific) mechanisms. Yet, no consensus exists on how crucial the latter are for the inception of semantic distinctions. To address this issue, we combined electroencephalographic (EEG) and intracranial EEG (iEEG) to examine when nouns denoting facial body parts (FBPs) and nonFBPs are discriminated in face-processing and multimodal networks. First, FBP words increased N170 amplitude (a hallmark of early facial processing). Second, they triggered fast (similar to 100 ms) activity boosts within the face-processing network, alongside later (similar to 275 ms) effects in multimodal circuits. Third, iEEG recordings from face-processing hubs allowed decoding similar to 80% of items before 200 ms, while classification based on multimodal-network activity only surpassed similar to 70% after 250 ms. Finally, EEG and iEEG connectivity between both networks proved greater in early (0-200 ms) than later (200-400 ms) windows. Collectively, our findings indicate that, at least for some lexico-semantic categories, meaning is construed through fast reenactments of modality-specific experience.
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