Changes in local and distant EEG activities before, during and after the observation and execution of sequential finger movements.
OBJECTIVE
To consider cortical oscillations at local and distant/large scale levels during the time course of motor events under both an observation and an execution condition.


METHODS
Local and distant changes in EEG cortical oscillations were respectively assessed by the Event-Related Desynchronization/Synchronization technique and the Synchronization Likelihood technique. Data collected prior to, during, and after observation and execution of complex sequential finger movements were used to investigate these changes. EEGs were recorded from 19 active sites across the cortex of 10 subjects. Sensorimotor activity was examined in alpha frequency bands.


RESULTS
Local power changes and global interregional synchronizations were two distinct phenomena, which occurred simultaneously and displayed different spatiotemporal patterns.


CONCLUSIONS
These findings demonstrate the complementary character of both analysis techniques. Results are discussed in light of the recent findings from the cognitive and behavioural neuroscience literature.
Calmels
C
C
Mission recherche, Institut national du sport et de l'éducation physique, 75012 Paris, France. claire.calmels@insep.fr
Jarry
G
G
Stam
C J
CJ
D000328:Adult; D000513:Alpha Rhythm; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000502:physiology*; D003344:Cortical Synchronization; D004569:Electroencephalography; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D055815:Young Adult