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Related Experiment Video

Updated: May 31, 2026

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Published on: February 23, 2020

Abnormal bidirectional plasticity-like effects in Parkinson's disease.

Ying-Zu Huang¹, John C Rothwell, Chin-Song Lu

¹Department of Neurology, Chang Gung Memorial Hospital, Taipei 10507, Taiwan.

Brain : a Journal of Neurology

|July 12, 2011

Summary

Levodopa-induced dyskinesia in Parkinson's disease may stem from abnormal synaptic plasticity. Patients with dyskinesia show impaired motor cortex depotentiation, suggesting altered plasticity control.

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Area of Science:

Neuroscience
Neurology
Motor Control

Background:

Levodopa-induced dyskinesia is a significant complication of Parkinson's disease treatment.
Abnormal synaptic plasticity in the corticostriatal system is a potential cause of dyskinesia.
Understanding plasticity control is crucial for managing advanced Parkinson's disease.

Purpose of the Study:

To investigate synaptic plasticity control in Parkinson's disease patients with and without levodopa-induced dyskinesia.
To examine long-term potentiation (LTP)-like plasticity and its reversibility (depotentiation) in the motor cortex.
To correlate plasticity changes with levodopa dosage and dyskinesia presence.

Main Methods:

Utilized a novel protocol to test depotentiation of LTP-like synaptic facilitation in the motor cortex.
Studied 10 healthy controls, 10 Parkinson's patients with dyskinesia (half levodopa dose), and 10 Parkinson's patients without dyskinesia (full or half levodopa dose).

Main Results:

Parkinson's patients without dyskinesia showed normal LTP and depotentiation on full levodopa, but impaired LTP on half dose.
Parkinson's patients with dyskinesia exhibited normal LTP-like potentiation on half levodopa but were unresponsive to depotentiation.
Motor cortex plasticity, specifically depotentiation, appears abnormal in Parkinson's patients with levodopa-induced dyskinesia.

Conclusions:

Depotentiation is impaired in the motor cortex of Parkinson's patients experiencing levodopa-induced dyskinesia.
Long-term potentiation-like plasticity in these patients is highly sensitive to levodopa administration, potentially more so than clinical symptoms.