Children with Autism Spectrum Disorder Show Impairments During Dynamic Versus Static Grip-force Tracking.
Autistic children struggle to match force to moving targets—use still cues first when teaching fine-motor skills.
01Research in Context
What this study did
Researchers asked 8- to young learners to squeeze a small bulb and match their grip force to a line on a screen.
Some trials showed a still line. Other trials showed the line moving up and down.
Kids had autism, ADHD, fetal alcohol syndrome, or were neurotypical. Each child tried both still and moving targets.
What they found
Children with autism missed the moving target far more than any other group.
Their grip wobbled with slow, large shakes that did not happen when the line stayed still.
Kids with ADHD or fetal alcohol syndrome tracked the moving line just as well as neurotypical peers.
How this fits with other research
Miller et al. (2014) first saw this slow-down in lab tasks. They found autistic kids needed extra time to spot and react to moving shapes. The new study shows the same lag now shows up in hand control.
De Meo-Monteil et al. (2019) found the opposite in adults: autistic adults timed visual taps better than typical adults. Together, the papers hint that the gap may shrink or flip as kids grow.
Wang et al. (2021) seems to clash. They saw some autistic kids prefer watching repetitive motion. But the tasks differ: the 2021 study watched what kids liked to look at, while the 2020 study tested if kids could squeeze in sync with motion. Liking and doing are not the same.
Why it matters
When you teach handwriting, utensil use, or tablet swipes, start with still pictures or objects. Let the child master the grip first. Add slow, predictable movement only after the static skill is solid.
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02At a glance
03Original abstract
Impairments in visuomotor integration (VMI) may contribute to anomalous development of motor, as well as social-communicative, skills in children with autism spectrum disorder (ASD). However, it is relatively unknown whether VMI impairments are specific to children with ASD versus children with other neurodevelopmental disorders. As such, this study addressed the hypothesis that children with ASD, but not those in other clinical control groups, would show greater deficits in high-VMI dynamic grip-force tracking versus low-VMI static presentation. Seventy-nine children, aged 7-17 years, participated: 22 children with ASD, 17 children with fetal alcohol spectrum disorder (FASD), 18 children with Attention-Deficit Hyperactivity Disorder (ADHD), and 22 typically developing (TD) children. Two grip-force tracking conditions were examined: (1) a low-VMI condition (static visual target) and (2) a high-VMI condition (dynamic visual target). Low-frequency force oscillations <0.5 Hz during the visuomotor task were also examined. Two-way ANCOVAs were used to examine group x VMI and group x frequency effects (α = 0.05). Children with ASD showed a difficulty, above that seen in the ADHD/FASD groups, tracking dynamic, but not static, visual stimuli as compared to TD children. Low-frequency force oscillations <0.25 Hz were also significantly greater in the ASD versus the TD group. This study is the first to report VMI deficits during dynamic versus static grip-force tracking and increased proportion of force oscillations <0.25 Hz during visuomotor tracking in the ASD versus TD group. Dynamic VMI impairments may be a core psychophysiologic feature that could contribute to impaired development of motor and social-communicative skills in ASD. LAY SUMMARY: Children with autism spectrum disorder (ASD) show difficulties using dynamic visual stimuli to guide their own movements compared to their typically developing (TD) peers. It is unknown whether children without a diagnosis of ASD, but with other neurological disorders, show similar difficulties processing dynamic visual stimuli. In this study, we showed that children with ASD show a difficulty using dynamic, but not static, visual stimuli to guide movement that may explain atypical development of motor and social skills.
Autism research : official journal of the International Society for Autism Research, 2020 · doi:10.1002/aur.2370