Correlation between cortical plasticity, motor learning and BDNF genotype in healthy subjects

P. Li Voti, A. Conte, A. Suppa, E. Iezzi, M. Bologna, M. S. Aniello, G. Defazio, J. C. Rothwell, Alfredo Berardelli

Research output: Contribution to journalArticle

Abstract

There is good evidence that synaptic plasticity in human motor cortex is involved in behavioural motor learning; in addition, it is now possible to probe mechanisms of synaptic plasticity using a variety of transcranial brain-stimulation protocols. Interactions between these protocols suggest that they both utilise common mechanisms. The aim of the present experiments was to test how well responsiveness to brain-stimulation protocols and behavioural motor learning correlate with each other in a sample of 21 healthy volunteers. We also examined whether any of these measures were influenced by the presence of a Val66Met polymorphism in the BDNF gene since this is another factor that has been suggested to be able to predict response to tests of synaptic plasticity. In 3 different experimental sessions, volunteers underwent 5-Hz rTMS, intermittent theta-burst stimulation (iTBS) and a motor learning task. Blood samples were collected from each subject for BDNF genotyping. As expected, both 5-Hz rTMS and iTBS significantly facilitated MEPs. Similarly, as expected, kinematic variables of finger movement significantly improved during the motor learning task. Although there was a significant correlation between the effect of iTBS and 5-Hz rTMS, there was no relationship in each subject between the amount of TMS-induced plasticity and the increase in kinematic variables during motor learning. Val66Val and Val66Met carriers did not differ in their response to any of the protocols. The present results emphasise that although some TMS measures of cortical plasticity may correlate with each other, they may not always relate directly to measures of behavioural learning. Similarly, presence of the Val66Met BDNF polymorphism also does not reliably predict responsiveness in small groups of individuals. Individual success in behavioural learning is unlikely to be closely related to any single measure of synaptic plasticity.

Original languageEnglish
Pages (from-to)91-99
Number of pages9
JournalExperimental Brain Research
Volume212
Issue number1
DOIs
Publication statusPublished - Jul 2011

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Brain-Derived Neurotrophic Factor
Healthy Volunteers
Genotype
Learning
Neuronal Plasticity
Biomechanical Phenomena
Motor Cortex
Brain
Fingers
Volunteers
Genes

Keywords

  • 5-Hz rTMS
  • BDNF
  • Cortical plasticity
  • Theta burst stimulation

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Correlation between cortical plasticity, motor learning and BDNF genotype in healthy subjects. / Li Voti, P.; Conte, A.; Suppa, A.; Iezzi, E.; Bologna, M.; Aniello, M. S.; Defazio, G.; Rothwell, J. C.; Berardelli, Alfredo.

In: Experimental Brain Research, Vol. 212, No. 1, 07.2011, p. 91-99.

Research output: Contribution to journalArticle

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