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Related Experiment Video

Updated: Jun 26, 2026

Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis

Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis

Published on: November 21, 2013

Case-control study of writer's cramp.

E Roze¹, A Soumaré, I Pironneau

¹Department of Neurology, Hôpital Pitié-Salpêtrière, Paris F-75013, France. emmanuel.roze@psl.aphp.fr

Brain : a Journal of Neurology

|January 31, 2009

Summary

Writer's cramp risk increases with daily writing time and abrupt increases in writing load. Higher education, head trauma, and myopia are also associated risk factors for this task-specific focal dystonia.

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Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment

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Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis

Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis

Published on: November 21, 2013

Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment

Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment

Published on: March 11, 2021

Area of Science:

Neurology
Occupational Health

Background:

Task-specific focal dystonias, like writer's cramp, arise from a mix of individual susceptibility and environmental influences.
Previous research lacked case-control studies investigating specific risk factors for writer's cramp.

Purpose of the Study:

To identify risk factors associated with writer's cramp through a case-control study.

Main Methods:

A case-control study involving 104 patients with writer's cramp and matched controls.
Data collection included detailed medical and writing history (occupational and hobby-related).

Main Results:

Higher education (college/university degree) was more frequent in cases (OR=4.6).
Increased daily writing time (P-trend=0.001) and a sudden rise in writing time in the preceding year (OR=5.7) elevated risk.
Head trauma with loss of consciousness (OR=3.5) and myopia (OR=4.1) were significant risk factors.

Conclusions:

A dose-response relationship exists between daily handwriting duration and writer's cramp.
Acute triggers, such as a sudden increase in writing load, may overwhelm homeostatic regulation of cortical plasticity in predisposed individuals, leading to dystonia.