- The Sequence Effect in De Novo Parkinson’s Disease
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Suk Yun Kang, Toshiaki Wasaka, Ejaz A. Shamim, Sungyoung Auh, Yoshino Ueki, Nguyet Dang, Mark Hallett
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J Mov Disord. 2011;4(1):38-40.
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DOI: https://doi.org/10.14802/jmd.11006
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Abstract
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Background and Purpose
The sequence effect (SE) in Parkinson’s disease (PD) denotes progressive slowness in speed or progressive decrease in amplitude of repetitive movements. It is a well-known feature of bradykinesia and is considered unique in PD. Until now, it was well-documented in advanced PD, but not in drug-naïve PD. The aim of this study is to know whether the SE can also be measured in drug-naïve PD.
Methods
We measured the SE with a computer-based, modified Purdue pegboard in 4 drug-naïve PD patients, which matched our previous study with advanced PD patients.
Results
We observed progressive slowness during movement, that is, SE. Statistical analysis showed a strong statistical trend toward the SE with the right hand, but no significance with the left hand. There was no statistical significance of SE with either the more or less affected hands.
Conclusions
These results indicate that the SE can be identified in drug-naïve PD, as well as in advanced PD, with objective measurements and support the idea that the SE is a feature in PD observed during the early stage of the disease without medication.
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Citations
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