MI	Motor imagery
AO	Action observation
MI-SW	Motor imagery of swallowing
MEG	Magnetoencephalography
MMSE	Mini-mental state examination
ERSPs	Event-related spectral perturbations
ERD	Event-related desynchronization
ERS	Event-related synchronization
PLV	Phase locking value
ROI	Regions of interest
CG	Control group
M-AIG	Male action observation-induced group
F-AIG	Female action observation-induced group