Three-Dimensional Kinematic Analysis of Prehension Movements in Young Children with Autism Spectrum Disorder: New Insights on Motor Impairment.
Autistic preschoolers show intact grasp but disrupted reach kinematics—simplify the reach demands when teaching fine-motor tasks.
01Research in Context
What this study did
The team filmed preschoolers with autism while they reached for and picked up toys.
Cameras tracked every finger and joint in 3-D.
They compared the motion to typically developing kids of the same age.
What they found
The reach part looked different: shaky paths, extra corrections, awkward angles.
The grasp part looked fine: same finger placement, same closing time.
Only the early, planning stage of the movement broke down.
How this fits with other research
Crippa et al. (2015) saw the same reach problems in toddlers and used them to spot autism with 96 % accuracy.
Sun et al. (2024) pooled 43 studies and found slower, wobblier upper-body movement across the lifespan.
Sosnowski et al. (2022) tracked infants and showed that odd motor trajectories at 6–18 months predict later autism severity.
Together the papers draw a line: early reach control is a persistent autism marker, not just a delay.
Why it matters
When you teach dressing, writing, or play skills, cut the reach demand first.
Place objects closer, give visual guides, or start with the child’s hand on the item.
A stable reach sets up the grasp that follows.
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02At a glance
03Original abstract
The study was aimed at better clarifying whether action execution impairment in autism depends mainly on disruptions either in feedforward mechanisms or in feedback-based control processes supporting motor execution. To this purpose, we analyzed prehension movement kinematics in 4- and 5-year-old children with autism and in peers with typical development. Statistical analysis showed that the kinematics of the grasp component was spared in autism, whereas early kinematics of the reach component was atypical. We discussed this evidence as suggesting impairment in the feedforward processes involved in action execution, whereas impairment in feedback-based control processes remained unclear. We proposed that certain motor abilities are available in autism, and children may use them differently as a function of motor context complexity.
Journal of autism and developmental disorders, 2016 · doi:10.1007/s10803-016-2732-6