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Verbal working memory predicts co-speech gesture: evidence from individual differences.

Maureen Gillespie1, Ariel N James2, Kara D Federmeier2

  • 1University of New Hampshire, United States.

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Gestures aid language production by supporting verbal working memory (VWM) when cognitive resources are limited. Individual differences in gesturing are linked to cognitive abilities, particularly VWM capacity.

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Area of Science:

  • Cognitive Psychology
  • Linguistics
  • Human Communication

Background:

  • Gesture plays a role in language production, but its precise function is debated.
  • Previous theories suggest gestures may alleviate verbal working memory (VWM) load or aid lexical retrieval.

Purpose of the Study:

  • To investigate the relationship between individual differences in VWM, lexical retrieval, and spontaneous gesture production.
  • To determine if gesture primarily supports VWM or lexical retrieval during language production.

Main Methods:

  • Fifty participants completed individual difference measures assessing VWM and lexical retrieval.
  • Participants described short cartoon clips to elicit spontaneous gestures.
  • Gesture rates were correlated with VWM and lexical retrieval scores.

Main Results:

  • Lexical retrieval abilities did not predict spontaneous gesture rates.
  • Lower VWM capacity was significantly associated with higher rates of spontaneous gesture.
  • These findings suggest gesture supports language production by compensating for limited VWM.

Conclusions:

  • Gestures facilitate language production, particularly by supporting verbal working memory under cognitive load.
  • Individual differences in the propensity to gesture are linked to underlying cognitive capacities, specifically VWM.
  • This research provides evidence for gesture's role in cognitive offloading during speech production.