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The role of the coil click in TMS assessed with simultaneous EEG

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Nikulin, V. V., Ruohonen, J., & Ilmoniemi, R. J. (1999). The role of the coil click in TMS assessed with simultaneous EEG. Clinical Neurophysiology, 110(8), 1325-1328. doi:10.1016/S1388-2457(99)00070-X.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-4136-5
Objective: We have used EEG to measure effects of air- and bone-conducted sound from the coil in transcranial magnetic stimulation (TMS). Methods: Auditory-evoked potentials to TMS were recorded in three different experimental conditions: (1) the coil 2 cm above the head, (2) the coil 2 cm above the head but rigidly connected by a plastic piece to the scalp, (3) the coil pressed against the scalp over the motor cortex. Results: The acoustical click from the TMS coil evoked large auditory potentials, whose amplitude depended critically on the mechanical contact of the coil with the head. Conclusion: Both air- and bone-conducted sounds have to be taken into account in the design and interpretation of TMS experiments.