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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Linguistics

Background:

  • Face-to-face communication is multimodal, involving speech, facial expressions, gaze, and co-speech gestures.
  • Co-speech gestures vary in their degree of conventionality, ranging from widely understood signs to less conventional movements.
  • The neural basis for processing gesture conventionality is not fully understood.

Purpose of the Study:

  • To investigate whether the subjective perception of conventionality in co-speech gestures engages the classical language network.
  • To examine the role of the left inferior frontal gyrus (IFG) and posterior superior temporal gyrus (pSTG) in processing gesture conventionality.
  • To analyze changes in neural synchronization (intersubject covariance) within language networks under different task demands.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to study 36 subjects watching video-recorded story retellings.
  • A model-free analysis approach was employed to identify neural correlates of naturalistic stimuli.
  • Subjects performed tasks focusing on perceived conventionality or control conditions, modulating neural activity.

Main Results:

  • The conventionality task significantly increased neuronal synchronization in the left inferior frontal gyrus (IFG) compared to control tasks.
  • Synchronous activity in the left IFG was specifically observed during the conventionality task.
  • The left posterior superior temporal gyrus (pSTG) showed correlated activation across all conditions, with a trend towards increase during the conventionality task.

Conclusions:

  • The left IFG appears to be a core region for processing the perceived conventionality of co-speech gestures, similar to its role in spoken language.
  • Neural mechanisms involved in language comprehension may also underlie the interpretation of conventionalized gestures.
  • This suggests a shared neural basis for processing both spoken language and conventionalized gestures.