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- W2007229736 abstract "Abstract Spinocerebellar ataxia 6 (SCA6) is a hereditary disease characterized by a trinucleotide repeat expansion in the CACNA1A gene and late‐onset bilateral cerebellar atrophy. It is unclear if there is significant pathology outside of the cerebellum. We used transcranial magnetic stimulation to assess sensorimotor cortical circuits and cortical plasticity in 8 SCA6 patients and 8 age‐matched controls. Behavioral performance was assessed using a rhythmic tapping task. Neurophysiological measures of SCA6 patients showed a prolonged cortical silent period (CSP) but normal MEP recruitment curve, short‐latency afferent inhibition, long‐latency afferent inhibition and ipsilateral silent period. Paired‐associative stimulation induction also increased motor‐evoked potentials normally. SCA6 patients had greater variability with cued rhythmic tapping than normals and deteriorated when the cue was removed; in comparison, normal subjects had similar variability between cued and uncued rhythmic tapping. Analysis using a Wing–Kristofferson timing model indicated that both clock variance and motor delay variance were abnormal. Conclusion. In SCA6, the circuits for sensorimotor integration and the mechanisms for LTP‐like plasticity in the sensorimotor cortex are unimpaired. A prolonged CSP in SCA6 just like in other cerebellar atrophies would suggest that this neurophysiological change typifies cerebellar dysfunction. © 2007 Movement Disorder Society" @default.
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- W2007229736 date "2007-12-12" @default.
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- W2007229736 title "Prolonged cortical silent period but normal sensorimotor plasticity in spinocerebellar ataxia 6" @default.
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- W2007229736 doi "https://doi.org/10.1002/mds.21847" @default.
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