Mapping the somatosensory face representation by automated tactile stimulation during fMRI

Background: A standardized sensory stimulation of the face during fMRI is challenging due to the narrow geometry of the head coil. An automated application of stimuli is advantageous compared to a manual application as it does not introduce an examiner-dependent variance of stimulation and allows for an event-related study design as well as group comparisons. Methods: A new MR-compatible stimulation device delivered physiologic tactile stimuli (von Frey-filaments of normalized intensity) to the forehead, upper lip and dorsum of the hand on both sides during an event-related fMRI design. Whole brain functional im…