Social brain
How quickly does the brain process speech acts?
Open access · cc by · source: Europe PMC
The brain processes the social purpose of a word within 120 milliseconds of hearing it, at the same time it decodes the word's literal meaning.
Key findings
Brain responses for Naming and Request speech acts diverged during the 110 to 130 ms time window, showing extremely fast pragmatic processing. Requests elicited generally larger amplitude responses than Naming, particularly recruiting fronto-central motor regions and the right temporo-parietal junction. Semantic effects also emerged in this early window, which indicates that pragmatic and semantic information are processed simultaneously and interactively.
Methodology
The final sample of 18 healthy right-handed English speakers watched short videos of social interactions in a laboratory setting. Brain activity was recorded using 128 electrodes as participants viewed either a Naming or Request context using identical single nouns (representing hand-related or non-hand-related objects). Researchers then compared the brain's electrical responses across these different pragmatic and semantic conditions.
Limitations
Because the experiment used predictable, structured video blocks, it cannot tell us how the brain processes unexpected or spontaneous speech acts in real-world conversations. The study also relied entirely on isolated, single-word utterances rather than complete sentences, meaning the findings might not fully map onto natural sentence comprehension. Finally, because the spatial resolution of scalp-recorded EEG is limited, the study cannot pinpoint the exact anatomical boundaries of the active neural regions.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
The right temporoparietal junction is rapidly recruited within 110 to 130 milliseconds to process the pragmatic social purpose of spoken words, showing that social-contextual processing occurs in parallel with semantic decoding.
Evidence for the claim as stated.
Pragmatic social context and semantic word meanings are processed rapidly and in parallel within 110 to 130 milliseconds after hearing a word.
Evidence for the claim as stated.
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