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Primary writing tremor

P G Bain¹, L J Findley, T C Britton

¹MRC Human Movement and Balance Unit, Institute of Neurology, London, UK.

Brain : a Journal of Neurology

|December 1, 1995

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Primary writing tremor (PWT) is a task-specific condition affecting handwriting. This study details PWT

Area of Science:

Neurology
Movement Disorders

Background:

Primary writing tremor (PWT) is a task-specific tremor impacting handwriting.
Understanding its clinical and neurophysiological characteristics is crucial for diagnosis and management.

Purpose of the Study:

To elucidate the clinical and neurophysiological features of primary writing tremor.
To differentiate PWT from other tremor disorders like writer's cramp.

Main Methods:

Clinical assessment of 21 PWT patients (20 male, 1 female).
Electromyography (EMG) and accelerometry during writing tasks.
Assessment of forearm reciprocal inhibition.

Main Results:

PWT patients exhibited significantly reduced writing speeds compared to controls.

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EMG showed rhythmic activity (4.1-7.3 Hz) in hand and forearm muscles during writing.

Forearm reciprocal inhibition was normal, distinguishing PWT from writer's cramp.

Conclusions:

PWT is characterized by specific EMG patterns and normal reciprocal inhibition.
Patients can be sub-classified into type A (task-induced) and type B (positionally sensitive) tremors.
Findings aid in distinguishing PWT and inform potential therapeutic strategies.