Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning
The dopaminergic system is involved in learning and participates in the modulation of cortical excitability (CE). CE has been suggested as a marker of learning and use-dependent plasticity. However, results from separate studies on either motor CE or motor learning challenge this notion, suggesting...
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doaj-acf8d1532d734ce8a4d7e5f8ca99784c2020-11-24T23:56:46ZengFrontiers Media S.A.Frontiers in Behavioral Neuroscience1662-51532014-06-01810.3389/fnbeh.2014.0020191261Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learningSilke eLissek0Guido S. Vallana1Lara eSchlaffke2Melanie eLenz3Hubert R Dinse4Hubert R Dinse5Martin eTegenthoff6BG University Hospital Bergmannsheil, Ruhr-University BochumBG University Hospital Bergmannsheil, Ruhr-University BochumBG University Hospital Bergmannsheil, Ruhr-University BochumBG University Hospital Bergmannsheil, Ruhr-University BochumBG University Hospital Bergmannsheil, Ruhr-University BochumRuhr-University BochumBG University Hospital Bergmannsheil, Ruhr-University BochumThe dopaminergic system is involved in learning and participates in the modulation of cortical excitability (CE). CE has been suggested as a marker of learning and use-dependent plasticity. However, results from separate studies on either motor CE or motor learning challenge this notion, suggesting opposing effects of dopaminergic modulation upon these parameters: while agonists decrease and antagonists increase CE, motor learning is enhanced by agonists and disturbed by antagonists. To examine whether this discrepancy persists when complex motor learning and motor CE are measured in the same experimental setup, we investigated the effects of dopaminergic (DA) antagonism upon both parameters and upon task-associated brain activation. Our results demonstrate that DA-antagonism has opposing effects upon motor CE and motor sequence learning. Tiapride did not alter baseline CE, but increased CE post training of a complex motor sequence while simultaneously impairing motor learning. Moreover, tiapride reduced activation in several brain regions associated with motor sequence performance, i.e. dorsolateral PFC, supplementary motor area, Broca's area, cingulate and caudate body. Blood-oxygenation-level-dependent ( BOLD) intensity in anterior cingulate and caudate body, but not CE, correlated with performance across groups. In summary, our results do not support a concept of CE as a general marker of motor learning, since they demonstrate that a straightforward relation of increased CE and higher learning success does not apply to all instances of motor learning. At least for complex motor tasks that recruit a network of brain regions outside motor cortex, CE in primary motor cortex is probably no central determinant for learning success.http://journal.frontiersin.org/Journal/10.3389/fnbeh.2014.00201/fullDopaminefMRImotor learningTMScortical excitability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Silke eLissek Guido S. Vallana Lara eSchlaffke Melanie eLenz Hubert R Dinse Hubert R Dinse Martin eTegenthoff |
spellingShingle |
Silke eLissek Guido S. Vallana Lara eSchlaffke Melanie eLenz Hubert R Dinse Hubert R Dinse Martin eTegenthoff Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning Frontiers in Behavioral Neuroscience Dopamine fMRI motor learning TMS cortical excitability |
author_facet |
Silke eLissek Guido S. Vallana Lara eSchlaffke Melanie eLenz Hubert R Dinse Hubert R Dinse Martin eTegenthoff |
author_sort |
Silke eLissek |
title |
Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning |
title_short |
Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning |
title_full |
Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning |
title_fullStr |
Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning |
title_full_unstemmed |
Opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning |
title_sort |
opposing effects of dopamine antagonism in a motor sequence task - tiapride increases cortical excitability and impairs motor learning |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Behavioral Neuroscience |
issn |
1662-5153 |
publishDate |
2014-06-01 |
description |
The dopaminergic system is involved in learning and participates in the modulation of cortical excitability (CE). CE has been suggested as a marker of learning and use-dependent plasticity. However, results from separate studies on either motor CE or motor learning challenge this notion, suggesting opposing effects of dopaminergic modulation upon these parameters: while agonists decrease and antagonists increase CE, motor learning is enhanced by agonists and disturbed by antagonists. To examine whether this discrepancy persists when complex motor learning and motor CE are measured in the same experimental setup, we investigated the effects of dopaminergic (DA) antagonism upon both parameters and upon task-associated brain activation. Our results demonstrate that DA-antagonism has opposing effects upon motor CE and motor sequence learning. Tiapride did not alter baseline CE, but increased CE post training of a complex motor sequence while simultaneously impairing motor learning. Moreover, tiapride reduced activation in several brain regions associated with motor sequence performance, i.e. dorsolateral PFC, supplementary motor area, Broca's area, cingulate and caudate body. Blood-oxygenation-level-dependent ( BOLD) intensity in anterior cingulate and caudate body, but not CE, correlated with performance across groups. In summary, our results do not support a concept of CE as a general marker of motor learning, since they demonstrate that a straightforward relation of increased CE and higher learning success does not apply to all instances of motor learning. At least for complex motor tasks that recruit a network of brain regions outside motor cortex, CE in primary motor cortex is probably no central determinant for learning success. |
topic |
Dopamine fMRI motor learning TMS cortical excitability |
url |
http://journal.frontiersin.org/Journal/10.3389/fnbeh.2014.00201/full |
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