Objective: Because focal hand dystonia usually occurs in the over-learned stage, it would be valuable to know long-term motor learning characteristics and underlying pathophysiological features that might predispose to dystonia.
Methods: We conducted a case-control exploratory study of 15 visits over 12 weeks in the non-affected hand of a 4-finger sequence of 8 key presses in eight patients with FHD compared with eight age- and sex-matched, healthy volunteers (HVs). We studied the behavioral data and the physiological changes of the brain, including motor cortical excitability and cortical oscillations.
Results: There was no significant difference in the time to reach 100 % accuracy between FHD and HV during the 80-day follow-up period. There was a statistically significant difference in the accuracy of sequential finger movement tasks between patients with FHD compared with HVs over 12 weeks, but post-hoc analysis with multiple comparion correction did not show difference. There were no significant differences in recruitment curve changes and task-related power changes of alpha and beta bands.
Conclusion: Over 12 weeks, FHD have motor learning capacity comparable to HVs and do not show pathophysiological abnormalities.
Significance: Further studies would be valuable with more patients, more extended periods of practice, and more detailed electrophysiological explorations.
Keywords: Electroencephalography; Focal hand dystonia; Long-term; Motor learning; Transcranial magnetic stimulation; Writer’s cramp.
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