Evaluating handwriting in children with developmental coordination disorder (DCD): Temporal, spatial, pressure and grip-force measures.
Unsteady pen-grip force, not lack of practice, drives the slow, sloppy handwriting seen in kids with DCD.
01Research in Context
What this study did
Bartov et al. (2024) compared kids with developmental coordination disorder to same-age peers. They used a digital pen that records grip force, pressure, and every tiny hand movement.
Each child copied a short sentence while the tablet measured how hard they squeezed, how long they paused, and how wobbly their lines were.
What they found
Kids with DCD gripped the pen more weakly and the force jumped around. Their letters were bigger, slower, and wandered off the line.
The shakier the grip, the worse the writing looked and the longer it took to finish.
How this fits with other research
Rosenblum et al. (2013) already showed DCD writing is slow and messy. Rachel adds the new clue: grip-force chaos is the motor reason behind the mess.
Gosse et al. (2020) saw dyslexic kids slow down only when letters are fancy. Rachel shows DCD kids struggle even on simple letters because their fingers can’t hold steady force.
van den Bos et al. (2024) found ASD kids write better when they pause in the air. DCD kids, in contrast, pause because their grip gives out, not for planning. Same pause, different cause.
Why it matters
If a learner’s letters are big and wobbly, check grip force before you assign more practice sheets. A weak, jumpy squeeze predicts poor legibility better than age or IQ. Try a weighted pen or rubber grip to give the fingers stable feedback, then retest force with the tablet. Target the hand, not just the paper.
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Join Free →Place a cheap force-sensing pen or tablet stylus in the child’s hand; note any force drops or spikes during a 30-second copy task—if force wobbles, trial a weighted grip before extra drills.
02At a glance
03Original abstract
BACKGROUND: Writing involves complex sensorimotor and biomechanical processes that regulate pressure on the writing surface. Researchers analyze writing to understand kinetics and kinematics by evaluating temporal, spatial, and pressure aspects, yet discerning writing surface pressure and pen-grip force remains challenging. AIMS: To compare handwriting kinetics (pen grip-force and surface pressure) and kinematics (temporal-spatial) of children with developmental coordination disorder (DCD) with those of typically developing (TD) children. METHODS AND PROCEDURES: Twenty-seven children with DCD aged 7-12 years and 27 TD children matched by age and gender copied a 29-word passage onto a computerized tablet. Temporal, spatial and surface pressure as well as pen grip-force were measured with a tablet and a wearable device respectively. OUTCOMES AND RESULTS: The DCD group displayed significantly longer total writing time, mean letter time, and greater letter height, width, variance, spacing, area, and erasures than the TD group. Although there were no significant between-group differences in the surface pressure or maintaining pressure, the DCD group displayed weaker grip-force, p = .01, with greater variance. CONCLUSIONS AND IMPLICATIONS: The DCD group's weaker grip-force dynamics correlated with reduced legibility, form, and prolonged writing duration, revealing insights into handwriting mechanisms, particularly grip force, crucial for effective clinical interventions.
Research in developmental disabilities, 2024 · doi:10.1016/j.ridd.2024.104765