Study 3: Sham ≠ sham: Corticomuscular coherence and power modulations
3.2 Overall Conclusion
Based on the three studies conducted within the framework of the current thesis I can conclude that motor behaviour, either voluntary or forced, depends on oscillatory theta and beta activity in the action motor network.
Further motor behaviour is related to communication or coherence between the action motor system and the muscle. These findings are consistent with theoretical frameworks concerned with the role of oscillatory activity for the information flow between different brain areas, such as the “gating by inhibition” model by Jensen and Mazaheri (2010) or the “communication through coherence” by Fries (2005).
The described findings and resulting perspectives for future research nicely combine these two models by showing how phase, amplitude, frequency and corticomuscular coherence fine-tune and integrate a network which then leads to obvious motor behaviour.
Conducted studies and own research contributions
The studies of the current thesis were co-authored and supported by a number of colleagues. They are listed below together with my own research contributions.
Study 1: Now I am Ready—Now I am not: The Influence of Pre-TMS Oscillations and Corticomuscular Coherence on Motor-Evoked Potentials
Authors: Hannah Lienhard (published as Hannah Schulz), Teresa Übelacker, Julian Keil, Nadia Müller and Nathan Weisz
Published in Cerebral Cortex
I designed and implemented the experiment in cooperation with Nathan Weisz, carried out the EEG measurements or TMS stimulation together with Teresa Übelacker, wrote functions for data analysis, performed the data analyses and drafted the manuscript.
Study 2: A time to rest, a time to act: corticomuscular coherence is intrinsically entrained at a theta rhythm via the fronto-parietal action system.
Authors: Hannah Lienhard, Anne Hauswald, Jan-Mathijs Schoffelen and Nathan Weisz
Currently in preparation for submission
I designed and implemented the experiment in cooperation with Nathan Weisz, carried out the EEG measurements and TMS stimulation together with Teresa Übelacker and Pascal Binder, wrote functions for data analysis,
performed the data analyses and drafted the manuscript.
Study 3: Sham ≠ sham: Corticomuscular coherence and power modulations following a sham TMS pulse depends on prior TMS-intervention
Authors: Hannah Lienhard and Nathan Weisz
Currently submitted in Neuroimage (current satus from 14 th April 2014: under review)
I designed and implemented the experiment in cooperation with Nathan Weisz and Brigitte Gräter, carried out, or suppervised and supported Brigitte Gräter and Teresa Übelacker during EEG measurements and TMS
stimulation, performed the data analyses, wrote functions for data analysis and drafted the manuscript.
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