A. Stancak et G. Pfurtscheller, THE EFFECTS OF HANDEDNESS AND TYPE OF MOVEMENT ON THE CONTRALATERAL PREPONDERANCE OF MU-RHYTHM DESYNCHRONIZATION, Electroencephalography and clinical neurophysiology, 99(2), 1996, pp. 174-182
Event-related desynchronisation (ERD) of mu-rhythm was studied in 12 r
ight-handed and 11 left-handed subjects during brisk and slow self-pac
ed index finger movements of dominant and nondominant hand. Electroenc
ephalogram (EEG) was recorded from the sensorimotor hand area of both
hemispheres. The contralateral preponderance of mu-rhythm ERD in the p
re-movement period showed the following changes: (i) the contrasts bet
ween left- and right-finger movements were larger and earlier in the d
ominant than nondominant hemisphere in both handedness groups; (ii) ri
ght-handed subjects showed larger lateralisation of mu-rhythm ERD prio
r to right-finger as compared to left-finger movements, whereas about
equal contralateral preponderance for both sides was found in the left
-handed; (iii) the lateralisation mu-rhythm ERD was lower prior to bri
sk as compared to slow movements, especially in the left-handed subjec
ts. The results demonstrate that hand dominance, handedness and type o
f movement influence the proportion of pre-movement mu-rhythm desynchr
onisation in the left and right peri-rolandic area.