Pol Grasland-Mongrain edited Material_methods.tex  over 8 years ago

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\section{Material and methods}  In the experimental setup, pictured in Figure \ref{Figure1}-(B), the electrical current was induced by a TMS device using a 2x75 mm diameter butterfly coil (MagPro R100 device with C-B60 Butterfly coil, MagVenture, Farum, Danemark). The coil was placed 1 cm away from the medium, without any contact, and fixed to an independent support. The electrical current in the coil was in "monophasic" mode, i.e., an half cycle of 0.4 ms. ms, as illustrated in Figure \ref{InducedElectricalCurrent}.  Alternatively, "biphasic" mode, i.e., a full sinus cycle of 0.4 ms could be used, as illustrated in Figure \ref{InducedElectricalCurrent}. used.  At an amplitude of 100\%, the current reached a magnitude of 159 A.$\mu$s$^{-1}$ in the coil, leading to a peak magnetic field of 2 T at the surface of the coil and of 0.74 T at 20 mm in depth according to the manufacturer's specifications. The magnetic field was induced by a 5x5x5 cm$^3$ N48 NdFeB magnet (model BY0Y0Y0, K\&J Magnetics, Pipersville, PA, USA). The magnet was placed 1 cm away from the medium, without any contact, and fixed to a second independent support. The magnetic field intensity ranged from 200 to 300 mT at the medium location, as measured by a gaussmeter (Model GM2, AlphaLab, Salt Lake City, UT, USA).