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Shared processing of planning articulatory gestures and grasping.

L Vainio1, M Tiainen, K Tiippana

  • 1Division of Cognitive and Neuropsychology, Institute of Behavioural Sciences, University of Helsinki, Siltavuorenpenger 5 A, PL 9, 0014, Helsinki, Finland, lari.vainio@helsinki.fi.

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Summary

Mouth and hand movements are linked during planning, even without speaking. This study shows that silent reading or hearing syllables influences grip selection, suggesting shared planning for articulation and grasping.

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Speech Production

Background:

  • Articulatory gestures and hand actions are thought to be tightly integrated during planning.
  • Previous research demonstrated a correspondence between syllable articulation and grip selection (precision vs. power grip).
  • This effect was observed during overt articulation, leaving the role of planning integration unclear.

Purpose of the Study:

  • To investigate whether the articulation-grip correspondence effect persists without overt speech.
  • To explore the underlying mechanisms of integration between planning articulatory and grasping gestures.
  • To examine a novel pitch-grip correspondence effect.

Main Methods:

  • Experiment 1: Participants silently read syllables while performing grip selection tasks.
  • Experiment 2: Participants heard syllables and performed grip selection tasks.
  • Behavioral data on response times and accuracy were collected.

Main Results:

  • A significant correspondence effect between syllable articulation and grip selection was observed during silent reading and auditory perception.
  • Precision grip was faster with tongue-tip syllables, and power grip was faster with tongue-body syllables.
  • A pitch-grip correspondence effect emerged: precision grip associated with high pitch, power grip with low pitch.

Conclusions:

  • The articulation-grip correspondence effect is driven by shared planning processes, not requiring overt articulation.
  • This suggests partially overlapped planning of vocal tract and hand shapes for articulation and grasping.
  • The findings offer insights into the neural mechanisms underlying sensorimotor integration and cross-modal correspondences.