Due to advances in research in neuroscience, the interest in non-invasive techniques for interaction with the brain has been increased. In this context, transcranial magnetic stimulation (TMS) is becoming increasingly important. TMS is based on the emission of magnetic pulses in order to cause depolarization in the cerebral cortex eliciting the spreading of electrical signals in the brain. Another important technique used in neuroscience is magnetic resonance imaging (MRI), which allow the localization of brain structures. MRI used concomitantly with computer graphics tools allows the knowledge of the distribution of the magnetic field produced by the coil of stimulation in the region of interest, through co-registration of maps of the TMS magnetic fields and MRI images. In order to stimulate specific areas, a considerable focalization of the electric field is required and butterfly coils are used, considered to be better than the circular coils. It's essential to know the distribution of the vector magnetic field produced by the coil, to evaluate the contributions of its three components, which depending on its magnitude can stimulate unwanted areas of the cortical region and influence the results obtained. This work could improve the accuracy of TMS.
News published in Agência FAPESP Newsletter about the scholarship: