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Abstract
Focal application of transcranial static magnetic field stimulation (tSMS) over the human motor cortex induces local changes in cortical excitability. Whether tSMS can also induce distant network effects, and how these local and distant effects may vary over time, is currently unknown. In this study, we applied 10 min tSMS over the left motor cortex of healthy subjects using a real/sham parallel design. To measure tSMS effects at the sensori-motor network level, we used resting-state fMRI. Real tSMS, but not sham, reduced functional connectivity within the stimulated sensori-motor network. This effect of tSMS showed time-dependency, returning to sham levels after the first 5 min of fMRI scanning. With 10 min real tSMS over the motor cortex we did not observe effects in other functional networks examined (default mode and visual system networks). In conclusion, 10 min of tSMS over a location within the sensori-motor network reduces functional connectivity within the same functional network.
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1 FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain (GRID:grid.414883.2) (ISNI:0000 0004 1767 1847)
2 FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain (GRID:grid.414883.2) (ISNI:0000 0004 1767 1847); Universidad de Castilla la Mancha, Talavera de la Reina, Toledo, Spain (GRID:grid.8048.4) (ISNI:0000 0001 2194 2329)
3 FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain (GRID:grid.414883.2) (ISNI:0000 0004 1767 1847); Malmö University, IoTaP (Internet of Things and People), Malmö, Sweden (GRID:grid.32995.34) (ISNI:0000 0000 9961 9487)
4 Hospital Universitario HM Puerta del Sur, HM Hospitales, HM CINAC (Centro Integral de Neurociencias Abarca Campal), Madrid, Spain (GRID:grid.428486.4) (ISNI:0000 0004 5894 9315)
5 Universidad Alfonso X El Sabio, Madrid, Spain (GRID:grid.464699.0) (ISNI:0000 0001 2323 8386)
6 Hospital Los Madroños, Madrid, Spain (GRID:grid.464699.0)
7 Hospital Universitario HM Puerta del Sur, HM Hospitales, HM CINAC (Centro Integral de Neurociencias Abarca Campal), Madrid, Spain (GRID:grid.428486.4) (ISNI:0000 0004 5894 9315); Hospital Nacional de Parapléjicos, SESCAM, Neural Bioengineering Group, Toledo, Spain (GRID:grid.414883.2) (ISNI:0000 0004 1767 1847)
8 Universidad Politécnica de Madrid, Laboratory for Clinical Neuroscience, Centre of Biomedical Technology, Madrid, Spain (GRID:grid.5690.a) (ISNI:0000 0001 2151 2978)
9 FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain (GRID:grid.414883.2) (ISNI:0000 0004 1767 1847); Hospital Los Madroños, Madrid, Spain (GRID:grid.414883.2)