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Neural bases of social communicative intentions in speech

MPG-Autoren
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Hellbernd,  Nele
Otto Hahn Group Neural Bases of Intonation in Speech, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Sammler,  Daniela
Otto Hahn Group Neural Bases of Intonation in Speech, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Zitation

Hellbernd, N., & Sammler, D. (2018). Neural bases of social communicative intentions in speech. Social Cognitive and Affective Neuroscience, 13(6), 604-615. doi:10.1093/scan/nsy034.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-6E32-C
Zusammenfassung
Our ability to understand others’ communicative intentions in speech is key to successful social interaction. Indeed, misunderstanding an ‘excuse me’ as apology, while meant as criticism, may have important consequences. Recent behavioural studies have provided evidence that prosody, that is, vocal tone, is an important indicator for speakers’ intentions. Using a novel audio-morphing paradigm, the present functional magnetic resonance imaging study examined the neurocognitive mechanisms that allow listeners to ‘read’ speakers’ intents from vocal prosodic patterns. Participants categorized prosodic expressions that gradually varied in their acoustics between criticism, doubt, and suggestion. Categorizing typical exemplars of the three intentions induced activations along the ventral auditory stream, complemented by amygdala and mentalizing system. These findings likely depict the stepwise conversion of external perceptual information into abstract prosodic categories and internal social semantic concepts, including the speaker’s mental state. Ambiguous tokens, in turn, involved cingulo-opercular areas known to assist decision-making in case of conflicting cues. Auditory and decision-making processes were flexibly coupled with the amygdala, depending on prosodic typicality, indicating enhanced categorization efficiency of overtly relevant, meaningful prosodic signals. Altogether, the results point to a model in which auditory prosodic categorization and socio-inferential conceptualization cooperate to translate perceived vocal tone into a coherent representation of the speaker’s intent.