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Related Experiment Videos

Dynamic changes in corticospinal excitability during motor imagery.

R Hashimoto1, J C Rothwell

  • 1MRC Human Movement and Balance Unit, Institute of Neurology, London, UK.

Experimental Brain Research
|April 1, 1999
PubMed
Summary

Motor imagery, or mentally rehearsing movements, dynamically alters motor cortex excitability. This brain activity mirrors changes seen during actual physical performance, impacting specific muscle responses.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • Motor imagery involves mentally simulating movements without physical execution.
  • Understanding the neural mechanisms underlying motor imagery is crucial for rehabilitation and performance enhancement.
  • Transcranial magnetic stimulation (TMS) provides a non-invasive method to probe motor cortex excitability.

Purpose of the Study:

  • To investigate temporal changes in motor-evoked potential (MEP) amplitudes during motor imagery.
  • To compare the effects of motor imagery on different hand and forearm muscles.
  • To determine if motor imagery influences spinal reflex excitability.

Main Methods:

  • Nine subjects performed imagined wrist flexion/extension at 1 Hz, cued by auditory signals.

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  • Transcranial magnetic stimulation (TMS) was applied over the left motor cortex at specific intervals after the cue.
  • Electromyography (EMG) recorded responses from flexor carpi radialis, extensor carpi radialis, and first dorsal interosseous muscles.
  • H-reflexes were measured in the flexor muscle in a subset of participants.

    • Main Results:

    • EMG responses were significantly larger in the flexor muscle during imagined flexion and in the extensor muscle during imagined extension.
    • No consistent changes in MEP amplitudes were observed in the intrinsic hand muscle (first dorsal interosseous).
    • Muscle relaxation was maintained, and H-reflex amplitudes showed no significant changes during motor imagery.

    Conclusions:

    • Motor imagery induces dynamic modulations in motor cortex excitability, mirroring those during actual movement.
    • These findings suggest that motor imagery engages neural pathways involved in motor preparation and execution.
    • The study highlights the potential of motor imagery as a tool for modulating neural activity related to motor control.