. Studies on accuracy of stereotactic targeting of basal ganglia . Deep brain stimulation (DBS) in new brain targets . Optical and impedance-based navigation in the brain . Correlation of active electrode contact location to subthalamic nucleus local field potentials . Correlation of DBS electrode location to effects and side effects of stimulation . Evaluation of anterior capulotomy for obsessive compulsive disorder . New MRI paradigms for individual visualisation of basal ganglia structures. . studies on speech and DBS . Simulation of electrical field in DBS . Critical evaluation of published literature on functional stereotactic neurosurgery . Evaluation of evidence based studies on surgery for dystonia within the international DBS in dystonia task force of the Movement Disorders Society . anatomo-pathological and radiologogical studies of the pedunculopontine nucleus . Appraisal of complications and complication avoidance studies in functional stereotactic surgery . New targets and new indications for DBS