title: Abnormal thalamocortical dynamics may be altered by deep brain stimulation: using magnetoencephalography to study phantom limb pain.
abstract: Deep brain stimulation (DBS) is used to alleviate chronic pain. Using magnetoencephalography (MEG) to study the mechanisms of DBS for pain is difficult because of the artefact caused by the stimulator. We were able to record activity over the occipital lobe of a patient using DBS for phantom limb pain during presentation of a visual stimulus. This demonstrates that MEG can be used to study patients undergoing DBS provided control stimuli are used to check the reliability of the data. We then asked the patient to rate his pain during and off DBS. Correlations were found between these ratings and power in theta (6-9) and beta bands (12-30). Further, there was a tendency for frequencies under 25 Hz to correlate with each other after a period off stimulation compared with immediately after DBS. The results are interpreted as reflecting abnormal thalamocortical dynamics, previously implicated in painful syndromes.
authors.affiliation: University of Oxford, Department of Anatomy Physiology and Genetics, Parks Road, Oxford, OX1 3PT, UK. nicola.ray@dpag.ox.ac.uk
authors.forename: N J
authors.initials: NJ
authors.lastname: Ray
authors.forename: N
authors.initials: N
authors.lastname: Jenkinson
authors.forename: M L
authors.initials: ML
authors.lastname: Kringelbach
authors.forename: P C
authors.initials: PC
authors.lastname: Hansen
authors.forename: E A
authors.initials: EA
authors.lastname: Pereira
authors.forename: J S
authors.initials: JS
authors.lastname: Brittain
authors.forename: P
authors.initials: P
authors.lastname: Holland
authors.forename: I E
authors.initials: IE
authors.lastname: Holliday
authors.forename: S
authors.initials: S
authors.lastname: Owen
authors.forename: J
authors.initials: J
authors.lastname: Stein
authors.forename: T
authors.initials: T
authors.lastname: Aziz
mesh_terms: D000328:Adult; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000503:physiopathology*; D046690:Deep Brain Stimulation / Q000009:adverse effects*; D005074:Evoked Potentials, Visual; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D015225:Magnetoencephalography; D010146:Pain / Q000209:etiology / Q000473:pathology*; D059408:Pain Management; D010147:Pain Measurement; D010591:Phantom Limb / Q000150:complications / Q000628:therapy; D010775:Photic Stimulation / Q000379:methods; D013788:Thalamus / Q000503:physiopathology*