Publications by authors named "I Jasper"
Writing kinematics and pen forces in writer's cramp: effects of task and clinical subtype.
Clin Neurophysiol
November 2010
Article Synopsis
- Writer's Cramp (WC) is a type of focal-hand-dystonia causing issues with handwriting, with limited understanding of its kinematic and dynamic characteristics among different subtypes.
- A study analyzed handwriting in 41 individuals (14 simple WC, 13 dystonic WC, 14 healthy) using kinematic and force metrics across varying task complexities.
- Results indicated significant writing deficits in all patient groups, regardless of WC subtype, and that simpler writing tasks did not improve performance, suggesting fundamental issues in writing mechanics rather than a progression of severity.
The aim of the present study was to analyze the circadian rhythmicity in handwriting kinematics and legibility and to compare the performance between Dutch and German writers. Two subject groups underwent a 40 h sleep deprivation protocol under Constant Routine conditions either in Groningen (10 Dutch subjects) or in Berlin (9 German subjects). Both groups wrote every 3h a test sentence of similar structure in their native language.
View Article and Find Full Text PDFThe present study determined a circadian rhythm in force control during a visually guided tracking task under single task conditions (i.e., tracking task presented alone) and dual task conditions (i.
View Article and Find Full Text PDFArticle Synopsis
- The study explored how handwriting is affected by circadian rhythms in nine young male subjects undergoing sleep deprivation.
- Handwriting performance was assessed through speed, fluency, and script size every three hours, revealing significant tempo changes linked to body clock cycles, especially around melatonin secretion.
- Despite differences in speed and variability, overall writing fluency remained stable, indicating that basic handwriting skills are maintained, even after a lack of sleep.
Objective: To evaluate the use of a modified pen grip and subsequent handwriting training in patients with writer's cramp (WC).
Design: Handwriting performance with normal and modified pen grip was examined once in healthy controls and repeatedly in patients with WC (2 baseline tests before training, directly after training, after a 3-month follow-up).
Setting: Ambulatory care for motor writing disorders.