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Updated: May 31, 2026
12:33
Corticospinal Excitability Modulation During Action Observation
Published on: December 31, 2013
Grasping with tools: corticospinal excitability reflects observed hand movements
Andrea Cavallo1, Cristina Becchio, Luisa Sartori
1Centre for Cognitive Science, Department of Psychology, University of Torino, 10123 Torino, Italy.
Cerebral Cortex (New York, N.Y. : 1991)
|June 21, 2011
Summary
Observing actions with tools activates the corticospinal system by mirroring the hand movements, not the tool or the action goal. This detailed motor matching recruits the same muscles used in the observed action.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- Action observation activates the corticospinal system.
- It is debated whether this activation reflects movement replication or action goals.
Purpose of the Study:
- To investigate if corticospinal facilitation during tool-use action observation mirrors hand movements, tool movements, or the action's goal.
- To determine the specificity of motor resonance in tool-assisted actions.
Main Methods:
- Transcranial magnetic stimulation (TMS) was used to record motor-evoked potentials (MEPs).
- Participants observed grasping an object using three types of pliers with varying hand-tool movements.
- MEPs were recorded from hand muscles (opponens pollicis, first dorsal interosseous).
Main Results:
- MEPs reflected the observed hand movements, not the tool's motion or the final goal.
- Specific hand muscles showed facilitation corresponding to the observed hand kinematics.
Conclusions:
- Action observation of tool use leads to detailed motor matching of the observed hand movements.
- The corticospinal system recruits muscles online that mirror those engaged in the observed action, suggesting a focus on effector-specific representations.
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