title: Abnormal task driven neural oscillations in multiple sclerosis: A visuomotor MEG study.
abstract: Multiple sclerosis (MS) is a debilitating disease commonly attributed to degradation of white matter myelin. Symptoms include fatigue, as well as problems associated with vision and movement. Although areas of demyelination in white matter are observed routinely in patients undergoing MRI scans, such measures are often a poor predictor of disease severity. For this reason, it is instructive to measure associated changes in brain function. Widespread white-matter demyelination may lead to delays of propagation of neuronal activity, and with its excellent temporal resolution, magnetoencephalography can be used to probe such delays in controlled conditions (e.g., during a task). In healthy subjects, responses to visuomotor tasks are well documented: in motor cortex, movement elicits a localised decrease in the power of beta band oscillations (event-related beta desynchronisation) followed by an increase above baseline on movement cessation (post-movement beta rebound (PMBR)). In visual cortex, visual stimulation generates increased gamma oscillations. In this study, we use a visuomotor paradigm to measure these responses in MS patients and compare them to age- and gender-matched healthy controls. We show a significant increase in the time-to-peak of the PMBR in patients which correlates significantly with the symbol digit modalities test: a measure of information processing speed. A significant decrease in the amplitude of visual gamma oscillations in patients is also seen. These findings highlight the potential value of electrophysiological imaging in generating a new understanding of visual disturbances and abnormal motor control in MS patients. Hum Brain Mapp 38:2441-2453, 2017. © 2017 Wiley Periodicals, Inc.
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Eleanor L
authors.initials: EL
authors.lastname: Barratt
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Prejaas K
authors.initials: PK
authors.lastname: Tewarie
authors.affiliation: Division of Clinical Neurology, Queen's Medical Centre, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.
authors.forename: Margareta A
authors.initials: MA
authors.lastname: Clarke
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Emma L
authors.initials: EL
authors.lastname: Hall
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Penny A
authors.initials: PA
authors.lastname: Gowland
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Peter G
authors.initials: PG
authors.lastname: Morris
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Susan T
authors.initials: ST
authors.lastname: Francis
authors.affiliation: Division of Clinical Neurology, Queen's Medical Centre, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.
authors.forename: Nikos
authors.initials: N
authors.lastname: Evangelou
authors.affiliation: Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
authors.forename: Matthew J
authors.identifier: 0000-0002-8687-8185
authors.initials: MJ
authors.lastname: Brookes
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000503:physiopathology*; D009068:Movement / Q000502:physiology*; D009103:Multiple Sclerosis / Q000473:pathology / Q000503:physiopathology*; D009483:Neuropsychological Tests; D010775:Photic Stimulation; D014793:Visual Cortex / Q000503:physiopathology*
keywords: MEG; multiple sclerosis; neuronal oscillations; post-movement beta rebound; visual gamma; visuomotor abnormalities