title: Effects of cognitive demands on postmovement motor cortical deactivation.
abstract: Postmovement beta-rebounds induced by different intermovement intervals were investigated using magnetoencephalography in 14 healthy participants to test the hypothesis that postmovement motor cortical deactivation over the primary motor cortex depends on movement-related cognitive demands. Shorter latency and lower amplitude in postmovement beta-rebounds over the contralateral primary motor cortex were noted in the short-movement interval movement (repetitive finger lifting). Greater latency span of postmovement beta-rebounds jittering using single-trial analysis in the long-movement interval movement (discrete finger lifting) was observed. The study elucidates that the temporal interval between two adjacent movements reflecting different degrees of cognitive demands can affect postmovement motor cortical deactivation in terms of postmovement beta-rebounds latency and amplitude, and latency span of postmovement beta-rebounds jittering. Postmovement motor cortical deactivation can reflect cognitive demands in addition to motor and somatosensory processing.
authors.affiliation: Institute of Neuroscience, School of Life Science, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Yu-Zu
authors.initials: YZ
authors.lastname: Wu
authors.forename: David M
authors.initials: DM
authors.lastname: Niddam
authors.forename: Chun-Chuan
authors.initials: CC
authors.lastname: Chen
authors.forename: Kwong-Kum
authors.initials: KK
authors.lastname: Liao
authors.forename: Chou-Ming
authors.initials: CM
authors.lastname: Cheng
authors.forename: Li-Fen
authors.initials: LF
authors.lastname: Chen
authors.forename: Po-Lei
authors.initials: PL
authors.lastname: Lee
authors.forename: Shyan-Shiou
authors.initials: SS
authors.lastname: Chen
authors.forename: Tzu-Chen
authors.initials: TC
authors.lastname: Yeh
authors.forename: Jen-Chuen
authors.initials: JC
authors.lastname: Hsieh
mesh_terms: D000328:Adult; D003071:Cognition / Q000502:physiology*; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D005385:Fingers / Q000294:innervation / Q000502:physiology; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D013003:Somatosensory Cortex / Q000502:physiology; D013997:Time Factors