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Related Experiment Video

Updated: Feb 16, 2026

Corticospinal Excitability Modulation During Action Observation

Corticospinal Excitability Modulation During Action Observation

Published on: December 31, 2013

Directing visual attention during action observation modulates corticospinal excitability.

David J Wright¹, Greg Wood¹, Zoe C Franklin¹

¹Motor Cognition Research Group, Research Centre for Health, Exercise and Active Living, Manchester Metropolitan University, Manchester, United Kingdom.

|January 6, 2018

Summary

Directing visual attention to task-relevant objects during action observation enhances corticospinal excitability. Focusing on the ball during a pinching action increased motor evoked potentials (MEPs), suggesting optimized motor system activity for motor learning.

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Area of Science:

Neuroscience
Motor Control
Human Movement Observation

Background:

Transcranial magnetic stimulation (TMS) studies show corticospinal excitability increases during observed human movement.
The role of visual attention in modulating this excitability during action observation is under-explored.

Purpose of the Study:

To investigate how directing visual attention affects corticospinal excitability during the observation of a hand-pinching action.
To determine if focusing on specific objects (ball vs. finger) influences motor evoked potentials (MEPs).

Main Methods:

Nineteen participants observed a hand-pinching action in four conditions: static, free observation, finger-focused, and ball-focused.
Single-pulse TMS stimulated the left motor cortex, recording MEPs from right hand muscles (FDI, ADM).
Eye movements were tracked to correlate visual attention with motor responses.

Main Results:

The ball-focused condition significantly increased MEP amplitude in the first dorsal interosseous (FDI) muscle compared to other conditions.
Regression analysis revealed that fixations on the ball predicted MEP amplitude in the ball-focused condition.
Directing attention to the object of the action optimizes motor system engagement.

Conclusions:

Visual attention significantly modulates corticospinal excitability during action observation.
Focusing attention on task-relevant objects, like the ball in a pinching task, enhances motor system activation.
Action observation interventions for motor (re)learning can be optimized by instructing participants to focus on relevant objects.