Procedural learning in Parkinson's disease and cerebellar degeneration

@article{PascualLeone1993ProceduralLI,
  title={Procedural learning in Parkinson's disease and cerebellar degeneration},
  author={{\'A}lvaro Pascual-Leone and Jordan Henry Grafman and K. Clark and M Stewart and Steve G. Massaquoi and J S Lou and Mark Hallett},
  journal={Annals of Neurology},
  year={1993},
  volume={34}
}
We compared procedural learning, translation of procedural knowledge into declarative knowledge, and use of declarative knowledge in age‐matched normal volunteers (n = 30), patients with Parkinson's disease (n = 20), and patients with cerebellar degeneration (n = 15) by using a serial reaction time task. Patients with Parkinson's disease achieved procedural knowledge and used declarative knowledge of the task to improve performance, but they required a larger number of repetitions of the task… 
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The hypothesis that deficiencies in procedural motor learning are characteristic of Parkinson's disease is supported, adding to existing evidence which has suggested a key role for the basal ganglia when new sensorimotor mappings are required by novel task environments.
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The intact ability to learn a novel motor skill in non-demented, medicated patients with Parkinson's disease is demonstrated and confounding effects of motor control deficits on retention performance are indicated.
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TLDR
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TLDR
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