title: Effects of DBS on auditory and somatosensory processing in Parkinson's disease.
abstract: Motor symptoms of Parkinson's disease (PD) can be relieved by deep brain stimulation (DBS). The mechanism of action of DBS is largely unclear. Magnetoencephalography (MEG) studies on DBS patients have been unfeasible because of strong magnetic artifacts. An artifact suppression method known as spatiotemporal signal space separation (tSSS) has mainly overcome these difficulties. We wanted to clarify whether tSSS enables noninvasive measurement of the modulation of cortical activity caused by DBS. We have studied auditory and somatosensory-evoked fields (AEFs and SEFs) of advanced PD patients with bilateral subthalamic nucleus (STN) DBS using MEG. AEFs were elicited by 1-kHz tones and SEFs by electrical pulses to the median nerve with DBS on and off. Data could be successfully acquired and analyzed from 12 out of 16 measured patients. The motor symptoms were significantly relieved by DBS, which clearly enhanced the ipsilateral auditory N100m responses in the right hemisphere. Contralateral N100m responses and somatosensory P60m responses also had a tendency to increase when bilateral DBS was on. MEG with tSSS offers a novel and powerful tool to investigate DBS modulation of the evoked cortical activity in PD with high temporal and spatial resolution. The results suggest that STN-DBS modulates auditory processing in advanced PD. Hum Brain Mapp, 2011. © 2010 Wiley-Liss, Inc.
authors.affiliation: BioMag Laboratory, HUSLAB, Helsinki University Central Hospital (HUCH), Finland. katja.airaksinen@helsinki.fi
authors.forename: Katja
authors.initials: K
authors.lastname: Airaksinen
authors.forename: Jyrki P
authors.initials: JP
authors.lastname: Mäkelä
authors.forename: Samu
authors.initials: S
authors.lastname: Taulu
authors.forename: Antti
authors.initials: A
authors.lastname: Ahonen
authors.forename: Jussi
authors.initials: J
authors.lastname: Nurminen
authors.forename: Alfons
authors.initials: A
authors.lastname: Schnitzler
authors.forename: Eero
authors.initials: E
authors.lastname: Pekkonen
mesh_terms: D000161:Acoustic Stimulation; D000368:Aged; D016477:Artifacts; D046690:Deep Brain Stimulation; D004558:Electric Stimulation; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D006801:Humans; D015225:Magnetoencephalography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000503:physiopathology / Q000628:therapy*