Changes in functional coupling patterns during bimanual task performance.
Functional interaction between cortical areas may involve synchronization of activities, manifest as coherence between EEG signals. However, although EEG-EEG coherence changes when motor tasks are compared to each other or rest, there is little evidence that coherence is modulated within an action. To address this issue we used a bimanual drawer-opening task necessitating asymmetrical hand actions and comprising distinct movement phases. Pronounced modulations in EEG-EEG coherence in the beta band (>12-24 Hz) occurred with movement phase. Differences in coherence due to a switch in role of the hands were mainly observed in the alpha band (8-12 Hz). These findings suggest that inter-regional synchronization changes dynamically across task execution in line with behavioral performance.
Serrien
Deborah J
DJ
Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, London WC1N 3BG, UK. dserrien@ion.ucl.ac.uk
Brown
Peter
P
D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D009043:Motor Activity / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology*