The electroencephalographic beta synchronization following extension and flexion finger movements in humans

The cortical post-movement beta synchronization (PMBS) following brisk extension-flexion and flexion-extension movements of the right index finger was analyzed in twelve right-handed subjects using electroencephalographic recordings. The amplitude of PMBS over the contralateral sensorimotor area was enhanced and the focus of PMBS was widespread when finger flexion was the last movement. The results suggest that finger extension and flexion movements induce unequal beta synchronization over the contralateral M1 area possibly due to different complexity of the neuronal networks controlling these movements.