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Updated: Aug 17, 2026

Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment
Published on: March 11, 2021
Three brothers with a very-late-onset writer's cramp
Roongroj Bhidayasiri1, Joanna C Jen, Robert W Baloh
1Department of Neurology, UCLA Medical Center, Geffen School of Medicine, University of California, Los Angeles, California 90095, USA. rbh@ucla.edu
Abstract:
Writer's cramp (WC) is a form of focal task-specific dystonia, which is brought on by writing. Although most cases are sporadic, a positive family history is present in 5% to 20% of cases. To date, WC has been reported in several families with primary torsion dystonia, including DYT7, a pure focal dystonia, and in the mixed dystonias, DYT1, DYT6, and DYT13. We describe a family of Bulgarian descent with three brothers presenting with a very-late-onset dystonic WC, compatible with linkage to chromosome 18p.
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