Transcranial magnetic stimulation (TMS) has proven to be a useful tool in investigating the role of the articulatory motor cortex in speech perception. This article describes how to record motor evoked potentials (MEPs) from the lip muscles and how to disrupt the motor lip representation using repetitive TMS.
Möttönen, R., Rogers, J., Watkins, K. E. Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation. J. Vis. Exp. (88), e51665, doi:10.3791/51665 (2014).