Performance of a motor task learned on levodopa deteriorates when subsequently practiced off.

Published on Jan 1, 2014in Movement Disorders8.222
· DOI :10.1002/mds.25702
Elise D. Anderson2
Estimated H-index: 2
(OHSU: Oregon Health & Science University),
Fay B. Horak82
Estimated H-index: 82
(OHSU: Oregon Health & Science University)
+ 1 AuthorsJohn G. Nutt80
Estimated H-index: 80
(OHSU: Oregon Health & Science University)
Studies in animals and in people with Parkinson's disease (PD) demonstrate complex effects of dopamine on learning motor tasks; its effect on retention of motor learning has received little atten- tion. Recent animal studies demonstrate that practicing a task in the off state, when initially learned in the on state, leads to progressive deterioration in performance. We measured the acquisition and retention of 3 different motor tasks in the presence and absence of levodopa. Twenty individuals with Hoehn and Yahr Stage 1.5 to 3 PD practiced the tasks daily for two 4-day weeks, one half practicing on L-dopa the first week and off the sec- ond week. The other half practiced off L-dopa both weeks. The tasks were (1) alternate tapping of 2 keys, (2) moving the body toward 2 targets on a posturogra- phy device, and (3) mirror drawing of a star. For the tap- ping and body movement tests, those who practiced on the first week had a progressive decline in perform- ance with practice during week 2, while subjects off during week 1 maintained or improved. In contrast, for the mirror task, subjects on L-dopa initially had much more difficulty completing the task compared to sub- jects who practiced off. Both groups improved with practice the first week and had flat performance the second week. These data suggest that performance of speed-accuracy tasks learned in the on state may pro- gressively worsen if subsequently practiced in the off state. In addition, performance, but not learning, of some tasks may be impeded by L-dopa. V C 2013 Inter- national Parkinson and Movement Disorder Society.
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