Cited by 242Transcranial Magnetic Stimulation StudiesNeuroscience and Neuropharmacology ResearchNeurological disorders and treatments

Changes in human motor cortex excitability induced by dopaminergic and anti-dopaminergic drugs

Ziemann, Ulf, Tergau, Frithjof, Bruns, Dirk, Baudewig, Jürgen, Paulus, Walter·1997·Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control

Abstract

Transcranial magnetic stimulation was used to probe the acute effect of a single oral dose of various dopaminergic (levodopa, selegiline, bromocriptine) and antidopaminergic drugs (sulpiride, haloperidol) on motor cortex excitability in healthy volunteers. Motor threshold, intracortical inhibition and intracortical facilitation were tested in the abductor digiti minimi muscle. The latter two parameters were studied in a conditioning-test paired stimulus paradigm. The principal findings were an increase in intracortical inhibition by bromocriptine, and, conversely, a decrease in intracortical inhibition and an increase in intracortical facilitation by haloperidol. Effects peaked at delays consistent with the pharmacokinetics of the two drugs and were fully reversible. In conclusion, dopamine receptor agonists and antagonists can be considered inverse modulators of motor cortex excitability: the former enhance inhibition while the latter reduce it. The relation of the present findings to current models of motor excitability abnormalities in movement disorders will be discussed.

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Crossref · 10.1016/s0924-980x(97)00050-7

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Authors
Ziemann, U., Tergau, F., Bruns, D., Baudewig, J., & Paulus, W.
Affiliations
University of Göttingen (DE)
Corresponding author
Ziemann, Ulf
Venue
Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control
Publisher
Elsevier BV
Published
1997-12
Volume
105
Issue
6
Pages
430-437
ISSN
0924-980X (ISSN-L)
OpenAlex
W2067422553
Cited by
242
References
54
Citations by year
2026: 1 · 2025: 3 · 2024: 2 · 2023: 3 · 2022: 3 · 2021: 7 · 2020: 6 · 2019: 6 · 2018: 6 · 2017: 8 · 2016: 6 · 2015: 7 · 2014: 13 · 2013: 14 · 2012: 7
FWCI
2.38
Type
journal article
Language
en
Open access
closed
Locations
  • Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
Keywords
motor cortex excitability, dopamine, dopaminergic therapy, dopamine antagonists, bromocriptine, haloperidol, selegiline, levodopa, sulpiride, intracortical inhibition, intracortical facilitation, motor threshold, movement disorders, transcranial magnetic stimulation
MeSH terms
Administration, Oral, Adult, Analysis of Variance, Bromocriptine, Electromyography, Female, Haloperidol, Humans, Levodopa, Magnetics, Male, Motor Cortex, Physical Stimulation, Reference Values, Selegiline, Sulpiride, Dopamine Agonists, Dopamine Antagonists, Evoked Potentials, Motor

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