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Imagery-induced cortical excitability changes in stroke: a transcranial magnetic stimulation study
Paola Cicinelli1, Barbara Marconi, Marina Zaccagnini
1IRCCS Fondazione S. Lucia, Rehabilitation Hospital, and Neurologia Clinica, Universitá Campus Biomedico, Rome, Italy. p.cicinelli@hsantalucia.it
Cerebral Cortex (New York, N.Y. : 1991)
|May 6, 2005
Summary
Motor imagery enhances brain activity in stroke patients, potentially aiding motor recovery. This technique shows promise for post-stroke rehabilitation by improving cortical excitability in the affected hemisphere.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Motor Control
Background:
- Hemiparetic stroke patients often exhibit abnormal motor cortex asymmetry.
- Post-acute stroke rehabilitation strategies aim to restore motor function and cortical excitability.
Purpose of the Study:
- To investigate the effects of motor imagery and voluntary contraction on the abductor digiti minimi (ADM) muscle cortical representation in stroke patients.
- To compare motor cortex excitability between affected and unaffected hemispheres during different tasks.
Main Methods:
- Focal transcranial magnetic stimulation (TMS) was used to map the ADM muscle cortical representation.
- Participants included hemiparetic stroke patients in the post-acute stage.
- Tasks involved rest, motor imagery, and voluntary contraction.
Main Results:
- Motor imagery enhanced ADM map area and volume in both hemispheres, partially correcting asymmetry.
- Voluntary contraction maximally facilitated the unaffected hemisphere, while motor imagery and voluntary contraction showed similar facilitation in the affected hemisphere.
- Imagery-induced excitability changes were specific to the prime mover muscle and independent of lesion location.
Conclusions:
- Motor imagery significantly enhances cortical excitability in the affected hemisphere of post-stroke patients.
- Motor imagery may serve as a valuable tool in post-stroke motor rehabilitation by leveraging cortical plasticity.
- Further research is needed to link these excitability changes to short-term plasticity mechanisms.