Abstract

The motor system in Tourette syndrome has been found to be abnormal in previous fine-motor and neurophysiologic studies. This novel pilot study uses repetitive transcranial magnetic stimulation as a method to characterize the neurophysiology of the motor system in Tourette syndrome. We investigated the modulation of cortical excitability in adult Tourette syndrome patients by measuring motor-evoked potential amplitudes before and after applying intermittent theta burst transcranial magnetic stimulation. Motor-evoked potential amplitude changes over 1 and 10 minutes after intermittent theta burst transcranial magnetic stimulation were greater in 11 healthy controls than 10 adult patients with Tourette syndrome (P = 0.004). This altered neurophysiologic response to intermittent theta burst stimulation may contribute to the understanding of motor cortical mechanisms in Tourette syndrome.

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