title: A role of the basal ganglia in movement: the effect of precues on discrete bi-directional movements in Parkinson's disease.
abstract: The effect of a precue on improving movement initiation (i.e., reaction time; RT) is well understood, whereas its influence on movement execution (i.e., movement time; MT) has rarely been examined. The current study investigated the influence of a directional precue (i.e., left vs. right) on the RT and MT of simple and discrete bi-directional movements in a large sample of Parkinson's disease patients and healthy control participants. Both patients and controls were tested twice, with testing sessions separated by 2 hours. Patients were tested first following an overnight levodopa withdrawal and again after they had taken their medication. Both patients and controls demonstrated a significant RT improvement when information was provided in advance. MT in both healthy participants and medicated patients was, however, slower with the provision of advance information, while unmedicated patients showed no significant MT effects. These results suggest that while the basal ganglia may not be involved in motor program selection, they may dynamically modulate movement execution.
authors.affiliation: Faculty of Health Sciences at the University of Western Ontario, London, ON, Canada N6A 3K7.
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Johnson
authors.forename: Philip A
authors.initials: PA
authors.lastname: Vernon
authors.forename: Quincy J
authors.initials: QJ
authors.lastname: Almeida
authors.forename: Linda L
authors.initials: LL
authors.lastname: Grantier
authors.forename: Mandar S
authors.initials: MS
authors.lastname: Jog
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001479:Basal Ganglia / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D009044:Motor Cortex / Q000503:physiopathology; D010300:Parkinson Disease / Q000503:physiopathology*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology*; D012720:Severity of Illness Index