title: Is the rhythm of physiological tremor involved in cortico-cortical interactions?
abstract: The function of low-frequency oscillations as correlates of physiological tremor in supplementary motor area (SMA) and M1 remains unclear. In epicortical recordings from M1 and SMA and surface electromyographic (EMG) recordings in an epileptic patient we found reproducibly significant coherence between all three recording sites in the 6- to 15-Hz band. The partial coherence between SMA and muscle, however, was not significant. There was a constant phase shift between SMA and M1 indicating synchronized activity. We conclude that the cortical correlates of physiological tremor may be involved in linking different cortical motor centers and might therefore play a role in cortical motor planning.
authors.affiliation: Department of Neurology, University of Kiel, Kiel, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Raethjen
authors.forename: Michael
authors.initials: M
authors.lastname: Lindemann
authors.forename: Andre
authors.initials: A
authors.lastname: Morsnowski
authors.forename: Matthias
authors.initials: M
authors.lastname: Dümpelmann
authors.forename: Roland
authors.initials: R
authors.lastname: Wenzelburger
authors.forename: Henning
authors.initials: H
authors.lastname: Stolze
authors.forename: Urban
authors.initials: U
authors.lastname: Fietzek
authors.forename: Gerd
authors.initials: G
authors.lastname: Pfister
authors.forename: Christian E
authors.initials: CE
authors.lastname: Elger
authors.forename: Jens
authors.initials: J
authors.lastname: Timmer
authors.forename: Günther
authors.initials: G
authors.lastname: Deuschl
mesh_terms: D000328:Adult; D002540:Cerebral Cortex / Q000503:physiopathology*; D004558:Electric Stimulation / Q000295:instrumentation; D004576:Electromyography / Q000295:instrumentation; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000503:physiopathology; D018482:Muscle, Skeletal / Q000503:physiopathology; D009415:Nerve Net / Q000503:physiopathology; D010507:Periodicity; D014202:Tremor / Q000503:physiopathology*