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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Corticospinal Excitability Modulation During Action Observation
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Action Sounds Modulate Arm Reaching Movements.

Ana Tajadura-Jiménez1, Torsten Marquardt2, David Swapp3

  • 1UCL Interaction Centre, University College LondonLondon, UK; Department of Psychology, Universidad Loyola AndalucíaSeville, Spain.

Frontiers in Psychology
|October 4, 2016
PubMed
Summary
This summary is machine-generated.

Sound can alter our body perception, influencing how we move. This study shows that auditory cues can make participants feel their arm is longer, leading to slower reaching movements, demonstrating sound

Keywords:
action soundsauditory-dependent body-representationbody kinematicsbody-related sensory inputsgoal directed actions

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Area of Science:

  • Neuroscience
  • Perception
  • Motor Control

Background:

  • Body representations are updated by multisensory feedback during movement.
  • The influence of body representation changes on goal-directed actions is understudied, especially when induced by sound.

Purpose of the Study:

  • To investigate how auditory-induced changes in body representation affect goal-directed actions.
  • To examine the recalibration of arm morphology representation through sound.

Main Methods:

  • Participants reached for a target before and after auditory adaptation.
  • Spatial manipulation of hand-tapping sounds induced a perception of an elongated arm.

Main Results:

  • Reaching movements after adaptation showed reduced velocity, consistent with a longer arm representation.
  • Kinematic changes suggest auditory-driven recalibration of somatosensory arm representation.

Conclusions:

  • Auditory feedback can recalibrate body-representation, specifically arm morphology.
  • Represented body size may serve as a perceptual ruler guiding actions and distance perception.