Source localization of induced cortical oscillations during tactile fingerstimulation

We investigated the EEG beta event-related synchronization (ERS) after tact ile finger stimulation in three subjects. Prior studies from our group usin g electrical stimulation and self-paced movement showed a beta rebound with in one second after stimulation respectively movement offset. As the tactil e-stimulation-data showed a similar ERS behaviour, we extracted the cortica l sources for this beta rebound by the linear estimation method in order to see whether the representation areas of different fingers were distinguish able (as is possible with MEG data). Although realistic head models of two subjects were used for the calculations the fingers could not be spatially distinguished. However, regarding the whole spatio-temporal pattern of the ERS for different fingers clear differences can be observed.