Brief report: postural reactivity to fast visual motion differentiates autistic from children with Asperger syndrome.
Autistic children showed reduced overall postural instability and, unlike Asperger and control children, did not tune their posture to fast visual motion.
01Research in Context
What this study did
The team watched how kids balanced when a wall of dots rushed toward them.
They tested 15 autistic kids, 15 kids with Asperger syndrome, and 15 typical kids.
A force plate under the kids' feet caught every tiny sway.
What they found
Autistic kids barely swayed when the dots sped up.
Kids with Asperger's and typical kids leaned back hard to keep balance.
Less sway linked to worse motor scores on the Autism Diagnostic Observation Schedule.
How this fits with other research
Manning et al. (2013) seems to disagree. They found motion problems only at slow speeds, not fast.
The gap is simple: Bruno checked body sway, Catherine checked if kids could see the motion at all.
Zhao et al. (2022) built on the idea. They used phone cameras to show head wobble during talk time can also flag autism.
Gong et al. (2020) added that uneven, floppy walking ties to social scores, just like the balance scores here.
Why it matters
You can add a 30-second balance test to your intake. Have the child stand on a Wii board while a phone app shows rushing dots. Less sway plus poor motor items on the ADOS-2 may point toward classic autism rather than Asperger profile.
Postural Reactivity as a Sensorimotor Marker
This brief report tested whether visuopostural tuning, the way posture adjusts to perceived visual motion, could serve as a sensorimotor marker linked to motor impairment severity in autism spectrum disorders.
Three autistic children with mild to severe motor impairments, three children with Asperger syndrome and soft motor signs, and nine control children were assessed for overall postural instability and reactivity to environmental motion.
What Differentiated Autistic Children
Overall postural instability was significantly reduced in autistic children compared with both Asperger and control children. As visual speed increased, control and Asperger children tuned their fore-aft postural sway to the display frequency.
Autistic children did not show this tuning. The dissociation suggests postural hyporeactivity to fast visual motion may track with the more severe motor profile seen in autism relative to Asperger syndrome.
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Tape a dot video to your phone, place a balance board on the floor, and time postural sway during a 10-second clip—note any child who barely moves.
02At a glance
03Original abstract
The aim of the present study was to search for a sensorimotor marker (i.e., visuopostural tuning) that could be correlated with the severity of motor impairments in children with autistic spectrum disorders. Given that autistic children were previously reported to be posturally hyporeactive to visually perceived environmental motion in comparison with normal control children (Gepner et al., 1995), we sought to determine whether children with Asperger syndrome (AS) would share the same postural hyporeactivity to visual motion. Three autistic children with mild to severe motor impairments, three AS children with soft motor signs, and nine normal control children were tested for overall postural instability and postural reactivity to environmental motion. Results indicate, first, that overall postural instability is significantly reduced in autistic children compared with both AS and normal children. Second, although postural oscillations in the fore-aft axis become more attuned to the oscillation frequency of an immersive dynamic visual display as visual speed is increased, in both control and AS subjects, this is not the case in autistic children. Despite the small number of subjects tested in this study, our data confirm the existence of a visuopostural detuning in autistic children. Third, they argue for a correlation between visuopostural tuning and severity of motor signs in children with autistic spectrum disorders. Finally, they suggest a differentiation between children with autism and children with AS with regard to postural reactivity to fast visual motion. Neurophysiological implications of these results are discussed. In particular, a visuocerebellar pathway deficit hypothesis in autism is proposed.
Journal of autism and developmental disorders, 2002 · doi:10.1023/a:1015410015859