Preprogramming and control activity of bimanual self-paced motor task in Parkinson's disease.
OBJECTIVE
The authors investigated programming (Bereitschaftspotential or BP) and control activity (Skilled Performance Positivity or SPP) of a bimanual, sequential, skilled motor act in off-therapy Parkinson's disease (PD) patients.


METHODS
We recorded Movement Related Potentials (MRPs) in 12, non-demented, off-therapy parkinsonian patients and in 17 control subjects who were performing a skilled, time-locked motor act, which was not routine in their everyday life but had to be learned: the Skilled Performance Task (SPT). BP, SPP and correct performances were evaluated in grand average waveforms and in sequential blocks.


RESULTS
The analysis of correct performances showed that accuracy in PD patients was significantly lower than in the control group and this accuracy did not improve throughout the blocks. A significantly low level of performances was associated with an increased BP amplitude (P<0.05) and decreased SPP amplitude (P<0.05) in PD patients.


CONCLUSIONS
Our findings suggest that skill motor learning is impaired in non-demented unmedicated PD patients. We discuss the view that PD patients may allocate more attentional resources, as suggested by the increased BP amplitude, the decreased SPP amplitude and the low correct performances, in order to perform a new skilled motor act.
Fattapposta
F
F
Istituto di Clinica delle Malattie Nervose e Mentali, Università degli Studi di Roma 'La Sapienza', Viale dell'Università 30, 00185, Rome, Italy. fattapposta@uniroma1.it
Pierelli
F
F
Traversa
G
G
My
F
F
Mostarda
M
M
D'Alessio
C
C
Soldati
G
G
Osborn
J
J
Amabile
G
G
D000368:Aged; D001288:Attention; D001921:Brain / Q000502:physiology / Q000503:physiopathology*; D001931:Brain Mapping; D004569:Electroencephalography; D004576:Electromyography; D004585:Electrooculography; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D006225:Hand / Q000294:innervation; D006801:Humans; D008297:Male; D008875:Middle Aged; D009048:Motor Skills / Q000502:physiology; D010300:Parkinson Disease / Q000503:physiopathology*; D011597:Psychomotor Performance / Q000502:physiology*; D012016:Reference Values; D014741:Video Recording