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Related Experiment Video

Updated: Jun 5, 2025

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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The perspective during gestural executions alters hemispherical specialization.

Ingo Helmich1, Sophie Mueller2, Robert Rein3

  • 1Department of Exercise and Sport Studies, Smith College, Northampton, MA, USA.

Behavioural Brain Research
|December 6, 2024
PubMed
Summary
This summary is machine-generated.

Tool-use pantomime (TUP) and motion quality presentation (MQP) gestures share brain functions. Egocentric TUP gestures involve both left and right hemispheres, while allocentric MQP gestures primarily engage the right hemisphere.

Keywords:
FNIRSMotor-cognitionPraxisTool-use gestures

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • The left hemisphere is often associated with egocentric movement perspectives in gestures.
  • Allocentric gestures, like motion quality presentation (MQP), may involve right hemispheric functions.
  • Tool-use pantomime (TUP) gestures are hypothesized to rely on distinct hemispheric lateralization compared to MQP.

Purpose of the Study:

  • To investigate the hemispheric specialization of gesture production.
  • To contrast the neural correlates of egocentric (TUP) versus allocentric (MQP) gestures.
  • To test the hypothesis that TUP and MQP gestures rely on different lateralized brain functions.

Main Methods:

  • Functional Near-Infrared Spectroscopy (fNIRS) was applied to 24 right-handed healthy individuals.
  • fNIRS measured brain activity over pre- and postcentral gyri in both hemispheres.
  • Participants performed three types of gestures: TUP, MQP, and meaningless gestures.

Main Results:

  • TUP gestures showed increased oxygenated hemoglobin (∆HbO2) in the left supramarginal gyrus and right precentral gyrus compared to meaningless gestures.
  • MQP gestures exhibited increased ∆HbO2 in the right precentral gyrus compared to meaningless gestures.
  • No significant difference in ∆HbO2 was observed when directly contrasting TUP and MQP gestures.

Conclusions:

  • Tool-use pantomime (TUP) and motion quality presentation (MQP) gestures share common motor-cognitive functions.
  • Gesture production is influenced by the perspective: egocentric TUP involves bilateral activation, while allocentric MQP relies more on the right hemisphere.
  • Hemispheric lateralization for gesture production depends on the egocentric or allocentric nature of the movement.