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• W2614167156 abstract "Background Resting Motor threshold (rMT) provides information about cortical motor excitability. Interestingly, the influences of the structural or functional variability of the motor system on the rMT inter-individual variability have been poorly investigated. Objective/hypothesis To investigate relationships between rMT and measures of brain structures and function of the motor system. The hypothesis is that cortical excitability not only depends on the primary motor cortex (M1) but also on the integration of information originating from its vicinity such as premotor (PMd and SMA) and post-central (S1) cortices. Methods We measured brain structures, including grey and white matter properties (cortical volume and fiber coherence respectively), and functional interaction (resting-state functional connectivity-FC) in areas contributing to the corticospinal tract axons, i. e, M1, S1, SMA and PMd in the dominant hemisphere of 21 healthy subjects. Results The rMT was inversely correlated with the FC between PMd and M1 (r = −0.496, 95%CI: −0.764; −0.081; p = 0.02) and the grey matter volume of the dominant hemisphere (r = −0.463, 95%CI: −0.746; −0.039; p = 0.03). The multiple regression analysis model retained the FC between M1 and PMd (coefficient: −25 ± 9) as well as the grey matter volume of the dominant hemisphere (coefficient: −0.15 ± 0.06) explaining 44% of the variance of the rMT (p: 0.005). When adding age and coil-to-cortex distance, two factors known to influence rMT, the model reached a R2 of 75% (p: 0.0001). Conclusions These results underline the major role of the PMd and the cortico-cortical connections toward M1 in the excitation of the corticospinal fibers likely through trans-synaptic pathways." @default.
• W2614167156 created "2017-05-26" @default.
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• W2614167156 date "2017-09-01" @default.
• W2614167156 modified "2023-10-17" @default.
• W2614167156 title "Anatomical and functional correlates of cortical motor threshold of the dominant hand" @default.
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• W2614167156 doi "https://doi.org/10.1016/j.brs.2017.05.005" @default.
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