Children with Autism Spectrum Disorder Show Impairments During Dynamic Versus Static Grip-force Tracking

Area of Science:

• Neuroscience
• Developmental Psychology
• Clinical Psychology

Background:

• Visuomotor integration (VMI) impairments are implicated in developmental disorders, including autism spectrum disorder (ASD).
• It remains unclear if VMI deficits are specific to ASD or present in other neurodevelopmental conditions.

Purpose of the Study:

• To investigate whether children with ASD exhibit greater deficits in dynamic VMI compared to children with fetal alcohol spectrum disorder (FASD) and attention-deficit/hyperactivity disorder (ADHD).
• To determine if VMI impairments are specific to ASD by comparing grip-force tracking in dynamic versus static conditions.

Main Methods:

• Seventy-nine children (7-17 years) participated: 22 with ASD, 17 with FASD, 18 with ADHD, and 22 typically developing (TD) children.
• Grip-force tracking was assessed under low-VMI (static target) and high-VMI (dynamic target) conditions.
• Analysis included group x VMI and group x frequency effects using two-way ANCOVAs.

Main Results:

• Children with ASD demonstrated significant difficulties tracking dynamic visual stimuli, more so than children with ADHD or FASD, and unlike their performance with static stimuli.
• Increased low-frequency force oscillations (<0.25 Hz) were observed during visuomotor tracking in children with ASD compared to TD children.
• This study is the first to report VMI deficits in dynamic versus static grip-force tracking and increased low-frequency force oscillations in ASD.

Conclusions:

• Dynamic VMI deficits appear to be a specific psychophysiological feature in children with ASD.
• These dynamic VMI impairments may contribute to atypical development of motor and social-communicative skills in ASD.
• The findings differentiate ASD from other neurodevelopmental disorders regarding dynamic visuomotor processing.