Experimental Brain Research

, Volume 203, Issue 1, pp 31–38 | Cite as

Repetitive transcranial magnetic stimulation (rTMS) of the dorsolateral prefrontal cortex (DLPFC) during capsaicin-induced pain: modulatory effects on motor cortex excitability

  • Brigida Fierro
  • Marina De Tommaso
  • Francesca Giglia
  • Giuseppe Giglia
  • Antonio Palermo
  • Filippo Brighina
Research Article

Abstract

Evidence by functional imaging studies suggests the role of left DLPFC in the inhibitory control of nociceptive transmission system. Pain exerts an inhibitory modulation on motor cortex, reducing MEP amplitude, while the effect of pain on motor intracortical excitability has not been studied so far. In the present study, we explored in healthy subjects the effect of capsaicin-induced pain and the modulatory influences of left DLPFC stimulation on motor corticospinal and intracortical excitability. Capsaicin was applied on the dorsal surface of the right hand, and measures of motor corticospinal excitability (test-MEP) and short intracortical inhibition (SICI) and facilitation (ICF) were obtained by paired-pulse TMS on left motor cortex. Evaluations were made before and at different times after capsaicin application in two separate sessions: without and with high-frequency rTMS of left DLPF cortex, delivered 10 min. after capsaicin application. We performed also two control experiments to explore: 1: the effects of Left DLPFC rTMS on capsaicin-induced pain; 2: the modulatory influence of left DLPFC rTMS on motor cortex without capsaicin application. Capsaicin-induced pain significantly reduced test MEP amplitude and decreased SICI leaving ICF unchanged. Left DLPFC rTMS, together with the analgesic effect, was able to revert the effects of capsaicin-induced pain on motor cortex restoring normal MEP and SICI levels. These data support the notion that that tonic pain exerts modulatory influence on motor intracortical excitability; the activation of left DLPFC by hf rTMS could have analgesic effects, reverting also the motor cortex excitability changes induced by pain stimulation.

Keywords

rTMS Capsaicin Pain DLPFC Motor cortical excitability Intracortical inhibition Intracortical facilitation 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Brigida Fierro
    • 1
  • Marina De Tommaso
    • 2
  • Francesca Giglia
    • 1
  • Giuseppe Giglia
    • 1
  • Antonio Palermo
    • 1
  • Filippo Brighina
    • 1
  1. 1.Department of Clinical NeurosciencesUniversity of PalermoPalermoItaly
  2. 2.Neurological and Psychiatric Sciences DepartmentUniversity of BariBariItaly

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