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Prolonged peripheral nerve stimulation induces persistent changes in excitability of human motor cortex
C Shona Charlton1, Michael C Ridding, Philip D Thompson
1Department of Physiology, Adelaide University, Australia.
Journal of the Neurological Sciences
|March 18, 2003
Summary
Peripheral nerve stimulation can induce lasting changes in motor cortex excitability. These neuroplastic effects in the human brain were observed for at least two hours after stimulation protocols.
Area of Science:
- Neuroscience
- Motor Control
- Neuroplasticity
Background:
- Motor cortical excitability is crucial for voluntary movement.
- Understanding neuroplasticity is key to developing rehabilitation strategies.
- Peripheral nerve stimulation is a potential tool for modulating brain activity.
Purpose of the Study:
- To investigate if prolonged peripheral nerve stimulation induces persistent plastic changes in human motor cortex excitability.
- To assess the duration of these induced changes.
Main Methods:
- Twelve subjects received three different peripheral stimulation protocols.
- Motor cortex excitability was measured using motor evoked potentials (MEPs) elicited by transcranial magnetic stimulation (TMS).
- MEPs were recorded before and for 2 hours after stimulation.
Main Results:
- All tested protocols induced prolonged, significant facilitation of MEPs in hand muscles for most subjects.
- Some muscles showed no change or even depression in MEP amplitude.
- Neuroplastic changes in motor cortex organization persisted for at least 2 hours.
Conclusions:
- Peripheral nerve stimulation protocols can induce lasting neuroplastic changes in the human motor cortex.
- These findings highlight the potential of afferent stimulation for modulating motor cortical organization.