Kinematic and kinetic characteristics of graphomotor skills in children with neurodevelopmental disorders: The impact of DCD, ADHD, and ASD traits.

Researchers studied handwriting skills in 17 children with DCD, ADHD, or autism using special technology that measures how they write. They found that children with more severe traits of these conditions generally had more difficulty with writing movements - they pressed harder, moved less smoothly, and had trouble staying on target. Surprisingly, children with stronger autism traits actually had better handwriting fluency despite movement difficulties. This suggests each condition affects handwriting differently and children may need different types of help.

This exploratory study examined handwriting (graphomotor) skills in 17 children aged 7-11 years diagnosed with DCD, ADHD, or ASD. Researchers used advanced tracing technology to measure writing parameters including pen pressure, velocity, and movement accuracy during line and wave tracing tasks. The study found that higher levels of DCD, ADHD, and ASD traits were generally associated with poorer graphomotor performance, including greater deviation from targets, increased acceleration and jerkiness, and higher pen pressure. However, interestingly, children with higher ASD traits showed better handwriting fluency despite motor difficulties.

These preliminary findings suggest that different neurodevelopmental conditions may have distinct handwriting profiles, supporting the need for individualized assessment and intervention approaches.

Findings suggest handwriting assessments should consider specific neurodevelopmental profiles rather than using one-size-fits-all approaches. Children with autism may have different intervention needs despite motor difficulties. Advanced kinematic analysis tools may help identify subtle differences in writing patterns across conditions to guide targeted interventions.

Very small sample size (n=17) limits generalizability. Exploratory design provides only preliminary findings. Cross-sectional design cannot establish causation. Mixed diagnostic groups make it difficult to isolate condition-specific effects. No control group for comparison.

Interest in the development of handwriting skills has been increasing; however, there is no consensus on the handwriting abilities of children with developmental coordination disorder (DCD), attention-deficit/hyperactivity disorder (ADHD), and autism spectrum disorder (ASD), and the specific handwriting characteristics associated with each neurodevelopmental disorder remain unclear. This exploratory study examined the preliminary associations between graphomotor skills and neurodevelopmental traits in 17 children (aged 7-11 years) diagnosed with DCD, ADHD, or ASD. The evaluation included handwriting fluency assessments, kinematic/kinetic analyses, and assessments of neurodevelopmental disorder traits. The participants performed tracing tasks involving straight lines, sine waves, and triangular waves using the TraceCoder® system.

Graphomotor kinematic/kinetic parameters, including deviation from the baseline, pen pressure, velocity, acceleration, jerk, and area, were quantified. Fluency was assessed using the Understanding Reading and Writing Skills of Schoolchildren II test. Neurodevelopmental traits were evaluated using the DCD Questionnaire, ADHD Rating Scale, and Autism Spectrum Quotient. Increased DCD, ADHD and ASD traits were correlated with deteriorations in graphomotor parameters, such as greater deviation, and increased acceleration, jerk, and pen pressure.

In contrast, higher ASD traits were associated with improvements in handwriting fluency. These preliminary findings suggest that graphomotor characteristics may vary depending on specific neurodevelopmental traits, underscoring the potential value of tailored assessments and interventions.