title: Cortically evoked potentials in the human subthalamic nucleus.
abstract: Deep brain stimulation (DBS) of the subthalamic nucleus (STN) alleviates motor symptoms in Parkinson's disease (PD) patients. However, in a substantial number of patients the beneficial effects of STN DBS are overshadowed by psychiatric side effects. We hypothesize that stimulation of the STN motor area will provide the optimal effect on the motor symptoms without inducing these side effects, and expect that motor cortex stimulation (MCS) evokes a spatially specific response within the STN, which identifies the STN motor area. We previously showed that MCS evokes responses in the unit activity specifically within certain areas of the STN. Unit activity is generally considered a measure of the output activity. To gain more insight into the neuronal input into the STN, we describe the results of cortically evoked subthalamic local field potentials (LFPs). We show that the cortically evoked LFPs follow a certain temporal and spatial pattern. The significant peaks of the evoked LFPs coincide with the timing of some of the inhibitions and excitations present in the unit responses. The spatial resolution of responses measured in the LFP to MCS is not high enough to identify the STN motor region. However, we believe that optimizing targeting techniques and the development of novel DBS electrodes will improve STN DBS therapy for PD patients.
authors: MIRA institute for Biomedical Engineering and Technical Medicine, Biomedical Signals and Systems group, University of Twente, Enschede, The Netherlands. d.g.m.zwartjes@utwente.nl
authors: Daphne G M
authors: DG
authors: Zwartjes
authors: Marcus L F
authors: ML
authors: Janssen
authors: Tjitske
authors: T
authors: Heida
authors: Vivianne
authors: V
authors: Van Kranen-Mastenbroek
authors: Lo J
authors: LJ
authors: Bour
authors: Yasin
authors: Y
authors: Temel
authors: Veerle
authors: V
authors: Visser-Vandewalle
authors: Peter H
authors: PH
authors: Veltink
mesh_terms: D000368:Aged; D002540:Cerebral Cortex / Q000503:physiopathology*; D046690:Deep Brain Stimulation; D004558:Electric Stimulation; D005071:Evoked Potentials; D006801:Humans; D008875:Middle Aged; D009044:Motor Cortex / Q000503:physiopathology; D009474:Neurons / Q000502:physiology; D010300:Parkinson Disease / Q000503:physiopathology / Q000628:therapy; D020531:Subthalamic Nucleus / Q000503:physiopathology*