Speed-Dependent Visual-Motor Tracking Differences in Children With Autism Relate to Core Symptoms

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomedical Engineering

Background:

• Children with autism spectrum disorder (ASD) often exhibit difficulties in visual-motor integration (VMI), particularly in dynamic situations.
• Challenges in processing speeded visual information can impact motor behavior in children with ASD.

Purpose of the Study:

• To investigate the impact of stimulus tracking speed on VMI in children with ASD compared to typically developing (TD) controls.
• To determine if ASD diagnosis and symptom severity are associated with impaired performance in speeded VMI tasks.

Main Methods:

• A grip-force tracking task was administered to 54 children (ages 8-12; 16 ASD, 38 TD) under static, slow, and fast visual trajectory conditions.
• Linear mixed-effects models analyzed diagnostic group differences in VMI.
• Correlations between VMI performance and autism symptom severity (ADOS-2, SRS-2) were examined.

Main Results:

• A significant interaction between diagnosis and condition revealed that children with ASD had greater tracking error than TD peers specifically in the fast condition (p=0.02).
• Both groups showed increased error with higher speeds, but ASD children exhibited more significant impairment under speeded conditions.
• Higher scores on ADOS-2 and SRS-2 were associated with increased VMI error in speeded conditions.

Conclusions:

• Impaired speeded dynamic visual-motor integration serves as a potential biomarker for autism spectrum disorder.
• These findings may inform the development of targeted behavioral interventions, such as adjusting visual cue speeds in therapy.
• Future research should focus on refining assessment tools and developing interventions for children with difficulties in speeded VMI.