Changes of intracortical inhibition during motor imagery in human subjects
Section snippets
Acknowledgements
We thank Professor Marco Schieppati (University of Genoa) for his helpful advice.
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2020, NeuroscienceCitation Excerpt :As suggested by (Grosprêtre et al., 2016), these findings bring evidence that cortical cell responsiveness to TMS may increase during MI and this could be mediated, at least in part, by a decrease of inhibitory activity within M1 (Grosprêtre et al., 2016). Indeed, some studies found a reduction of SICI during MI in comparison to rest when using the conventional SICI paradigms (Abbruzzese et al., 1999; Patuzzo et al., 2003; Stinear and Byblow, 2004; Kumru et al., 2008; Liepert and Neveling, 2009). Conversely, other studies failed to observe SICI modulation (Ridding and Rothwell, 1999; Stinear and Byblow, 2004; Sohn et al., 2006; Lebon et al., 2012a), indicating that mechanisms underlying SICI modulation during MI remain poorly understood.
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2017, NeuroscienceCitation Excerpt :The percentage of SICI is measured by dividing the MEP amplitude elicited by the paired pulse with the MEP amplitude elicited by the single suprathreshold pulse. A decrease in SICI was observed when subjects imagined finger movements, although no contraction was recorded or expected (Abbruzzese et al., 1999; Stinear and Byblow, 2004; Kumru et al., 2008; Liepert and Neveling, 2009). This reduction of inhibition within M1 could explain corticospinal facilitation during MI (Ridding et al., 1995).
Brain State-Dependent Transcranial Magnetic Closed-Loop Stimulation Controlled by Sensorimotor Desynchronization Induces Robust Increase of Corticospinal Excitability
2016, Brain StimulationCitation Excerpt :In the present study, we tested whether closed-loop single-pulse cortical stimulation triggered by motor imagery-related ß-ERD could induce a robust increase in corticospinal excitability. We chose kinesthetic motor imagery because this task activates similar neuronal correlates to those during motor execution [49–52], increases corticospinal excitability [53–56] and decreases short intracortical inhibition (SICI) [57] in a muscle- and time-specific way [55]. However, to the best of our knowledge, previous cortical stimulation studies revealed an increase of corticospinal excitability during specific brain states only [11,12] and did not show any robust changes following a brain state-dependent intervention.