Effects of cognitive demands on postmovement motor cortical deactivation.
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.
Wu
Yu-Zu
YZ
Institute of Neuroscience, School of Life Science, National Yang-Ming University, Taipei, Taiwan.
Niddam
David M
DM
Chen
Chun-Chuan
CC
Liao
Kwong-Kum
KK
Cheng
Chou-Ming
CM
Chen
Li-Fen
LF
Lee
Po-Lei
PL
Chen
Shyan-Shiou
SS
Yeh
Tzu-Chen
TC
Hsieh
Jen-Chuen
JC
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