Movement related brain potentials accompanying a non-productive voluntary action in humans.
This study assessed the effects of training and ability to execute a voluntary movement upon movement-related brain potentials (MRBPs). A self-paced thumb flexion initiated a sequence of autotriggered electrical stimuli over the median nerve that caused a twitch opposing the intended thumb extension. The MRBPs had earlier onsets during the first runs of skill acquisition than during later training sessions; they occurred earlier when they preceded a stimulus train than when they preceded a single stimulus; the onset was earlier over the vertex than over the premotor area. MRBP duration was longer during train stimulation when a voluntary effort had to be maintained against tetanic contraction. MRBP amplitude did not reflect task requirements under these experimental conditions.
Dimitrov
B
B
Motor Control Section, Institute of Physiology, Bulgarian Academy of Sciences, Sofia.
Ioffe
M
M
Gantchev
G N
GN
Vankov
A
A
Gavrilenko
T
T
D000328:Adult; D001921:Brain / Q000502:physiology*; D004558:Electric Stimulation; D004569:Electroencephalography; D004576:Electromyography; D005542:Forearm / Q000294:innervation; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000502:physiology; D008875:Middle Aged; D009043:Motor Activity; D009068:Movement; D009132:Muscles / Q000294:innervation