Hand-foot coordination is significantly influenced by motion direction in individuals with autism spectrum disorder.
Autistic brains tightly glue hand and foot direction during rhythm tasks, so teach new motor skills one plane at a time.
01Research in Context
What this study did
Umesawa et al. (2023) watched people with autism move their hands and feet at the same time.
They asked each person to swing their arms and legs in different directions while cameras tracked every motion.
The team compared the autism group to a same-age group without autism.
What they found
People with autism kept their limbs locked in the same direction far more often.
Their scores on the BOT-2 body-coordination test were also lower.
The tighter coupling happened even when the task told them to move in opposite directions.
How this fits with other research
Milgramm et al. (2021) saw similar clumsiness in six-year-olds with autism during a peg-moving task.
Sasson et al. (2022) found the same thing in running teenagers—more stride-to-stride wobble.
van den Bos et al. (2024) looks like a contradiction: longer pen-lift pauses helped kids with autism write better.
The difference is choice: handwriting lets the child pause on purpose, while Yumi’s task forces split-direction timing that the brain resists.
Why it matters
If a client’s limbs lock together during gross-motor warm-ups, blame directional coupling, not poor attention.
Break complex moves into separate planes first, then blend them slowly.
Use short practice bursts and celebrate small losses of “lock” to build flexible control.
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Start your warm-up with hand-only or leg-only motions, then pair them once each limb feels steady.
02At a glance
03Original abstract
Generally, when individuals attempt to move two limbs rhythmically in the opposite direction (e.g., flex the left hand and extend the left foot along the sagittal plane), the movements tend to be instead performed in the same direction. This phenomenon, known as directional constraint, can be harnessed to examine the difficulties in movement coordination exhibited by most individuals with autism spectrum disorder (ASD). While such difficulties have already been investigated through standardized clinical assessments, they have not been examined through kinematic methods. Thus, we employed a clinical assessment scale in an experimentally controlled environment to investigate whether stronger directional constraint during the rhythmic movement of two limbs is more pronounced and associated with decreased movement coordination in individuals with ASD. ASD and typically developing (TD) participants were asked to rhythmically move two limbs either in the same or opposite directions. In addition, the coordination skills of participants were assessed using the Bruininks-Oseretsky Test of Motor Proficiency Second Edition (BOT-2). Subjects with ASD showed significantly stronger directional constraint than TD participants during the contralateral and ipsilateral movement of the hand and foot. According to the pooled data from both groups, participants who showed stronger directional constraint during these two movement conditions also exhibited poorer coordinated movement skills in the BOT-2. These results suggest that people with ASD may have difficulties in inhibiting the neural signals that synchronize the direction of inter-limb movements, thus resulting in coordination disabilities. LAY SUMMARY: Individuals with autism spectrum disorder (ASD) often exhibit difficulties in coordinated movements. We asked those with ASD and typically developing (TD) participants to move two limbs (e.g., left hand and left foot) either in the same or the opposite direction. Results demonstrated that participants with ASD had more difficulties in counteracting the tendency of their hand and foot to synchronously move in the same direction. Our findings suggested that difficulties to suppress synchronized movements of the hand and foot result in coordination disabilities.
Autism research : official journal of the International Society for Autism Research, 2023 · doi:10.1002/aur.2837