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Motor resonance is modulated by an object's weight distribution.

Guy Rens1, Jean-Jacques Orban de Xivry2, Marco Davare3

  • 1The Brain and Mind Institute, University of Western Ontario, London, Ontario, N6A 3K7, Canada.

Neuropsychologia
|March 29, 2021
PubMed
Summary
This summary is machine-generated.

Motor resonance, the modulation of corticospinal excitability (CSE) during observed actions, is influenced by an object's weight distribution. This finding suggests the motor system processes intrinsic object properties during action observation and planning.

Keywords:
Action observationDyadic interactionMotor planningMotor resonanceObject lifting

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Transcranial magnetic stimulation (TMS) studies have identified 'motor resonance', where corticospinal excitability (CSE) changes during observed actions.
  • Motor resonance is typically linked to movement features like object size and kinematics that indicate weight.
  • The influence of an object's specific weight distribution on motor resonance remains less understood.

Purpose of the Study:

  • To investigate whether motor resonance is modulated by an object's weight distribution during lifting.
  • To examine if the motor system differentiates between left-sided and right-sided weight distributions.
  • To assess if these modulations occur during both action observation and action planning.

Main Methods:

  • 16 human participants observed and planned to lift a T-shaped manipulandum with an adjustable center of mass.
  • Lifting involved constrained digit positioning (collinear or noncollinear) to minimize object roll.
  • Transcranial magnetic stimulation (TMS) measured corticospinal excitability (CSE) during lift observation and planning phases.

Main Results:

  • CSE was significantly increased when observing or planning lifts with a right-sided weight distribution compared to a left-sided one.
  • This modulation of CSE appeared primarily driven by the weight distribution itself, not solely by observed digit positioning or muscle activity.
  • Similar modulations were observed during both action observation and action planning.

Conclusions:

  • Object weight distribution, a complex intrinsic property, significantly modulates motor system activation.
  • The motor system dynamically processes weight distribution information during both the observation and planning of lifting actions.
  • These findings advance our understanding of how the brain integrates object properties into motor representations.