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Author Spotlight: Deciphering the Cognitive and Neural Mechanisms of Gesture in Communication
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Embodied length gesture perception generates numerical semantics: An ERP study.

Rui Fu1, Lei Wang2, Guichun Zhou3

  • 1Department of Psychology, School of Education, Soochow University, Suzhou, China; Department of Psychology, School of Social and Behavioral Sciences, Nanjing University, Nanjing, China.

Acta Psychologica
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Summary

Embodied gestures significantly influence numerical judgments, with hand movements impacting number cognition. This suggests our bodies implicitly convey numerical magnitudes, supporting the embodied numerosity theory.

Keywords:
ERPEmbodied cognitionEmbodied lengthEmbodied numerosityNumerical semantics

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Area of Science:

  • Cognitive Neuroscience
  • Embodied Cognition

Background:

  • The sensorimotor system is crucial for number cognition.
  • Embodied numerosity links numerical understanding to sensorimotor experiences.
  • Limited research exists on hand motion's impact on numerical activation and abstract number concepts.

Purpose of the Study:

  • To investigate how perceived magnitude, specifically embodied gestures, affects numerical judgments.
  • To explore the relationship between hand motion, numerical semantics, and abstract number conceptions.
  • To examine electroencephalography (EEG) responses during numerical comparison tasks involving gestures.

Main Methods:

  • Participants performed a numerical comparison task while viewing variable-length gestures.
  • Electroencephalography (EEG) was used to record brain activity.
  • Embodied, semi-embodied, and non-embodied gesture conditions were compared.

Main Results:

  • A significant difference was found between embodied, semi-embodied, and non-embodied conditions, with embodied gestures showing the strongest influence.
  • The embodied effect activated the P2 component in frontal, fronto-central, central, and centro-parietal regions.
  • Increased gesture length and magnitude correlated with higher P2 responses.
  • Enhanced P2p activation was noted in the left parietal-occipital region under embodied and semi-embodied conditions.

Conclusions:

  • The findings support the embodied numerosity perspective.
  • Perception of embodied length gestures influences quantitative judgments.
  • The body implicitly conveys numerical magnitudes, highlighting the role of sensorimotor experiences in number cognition.