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 (~100 ms) activity boosts within the face-processing network, alongside later (~275 ms) effects in multimodal circuits. Third, iEEG recordings from face-processing hubs allowed decoding ~80% of items before 200 ms, while classification based on multimodal-network activity only surpassed ~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.

中文翻译：

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面对面语言的时间：体现机制支撑了人脑中与面部相关的含义的出现。

在解释意义时，大脑会招募多模态（概念）系统和具体化（模态特定）机制。然而，对于后者对初始阶段的重要性尚无共识语义区别。为了解决这个问题，我们结合脑电图 (EEG) 和颅内脑电图 (iEEG) 来检查表示面部身体部位 (FBP) 和非 FBP 的名词何时在面部处理和多模态网络中被区分。首先，FBP 词增加了 N170 振幅（早期面部处理的标志）。其次，它们在面部处理网络中触发了快速（~100 毫秒）的活动增强，同时在多模态电路中引发了后期（~275 毫秒）的影响。第三，来自面部处理中心的 iEEG 记录允许在 200 毫秒之前解码约 80% 的项目，而基于多模态网络活动的分类仅在 250 毫秒后超过约 70%。最后，证明两个网络之间的 EEG 和 iEEG 连接在早期（0-200 毫秒）比后期（200-400 毫秒）窗口更大。总的来说，我们的研究结果表明，