Motor learning of a bimanual task in children with unilateral cerebral palsy.
Children with unilateral cerebral palsy need twice as long and still gain less when learning two-hand tasks.
01Research in Context
What this study did
Kids with unilateral cerebral palsy practiced speed stacking with both hands.
Researchers watched how fast they learned compared with typically developing peers.
The task needed both hands to move together to stack cups in set order.
What they found
The CP group took twice as long to plateau.
They also improved about ten percent less than the peers.
Most peers peaked after three days; CP kids needed six to eight days.
How this fits with other research
Amore et al. (2011) showed the same kids need fifty percent more time and two-and-a-half times the lift force to separate objects.
The slow learning in Hung et al. (2013) lines up with that hidden force-control deficit.
Nordstrand et al. (2015) looks like a contradiction: baby-CIMT gave toddlers big bimanual gains.
The gap is age and timing: baby-CIMT started before twelve months, while speed stacking tested older kids who already had years of uneven hand use.
Gofer-Levi et al. (2013) also found CP kids fail to learn implicit motor sequences, backing the idea that practice alone is not enough.
Why it matters
Plan for double practice time when you teach bimanual skills.
Break sessions into short daily blocks across weeks, not days.
Pair practice with graded force tasks or constraint therapy to speed progress.
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02At a glance
03Original abstract
Children with unilateral cerebral palsy (CP) have been shown to improve their motor performance with sufficient practice. However, little is known about how they learn goal-oriented tasks. In the current study, 21 children with unilateral CP (age 4-10 years old) and 21 age-matched typically developed children (TDC) practiced a simple bimanual speed stack task over 15 days of practice. Both groups demonstrated their ability to learn the current bimanual task, but their rate of improvement and learning pattern differed. Children with unilateral CP overall were slower and improved ~10% less than TDC. Most of the improvement occurred during the first 3 days for the TDC, whereas performance did not plateau until 6-8 days for the children with unilateral CP. This initial slower learning rate for children with unilateral CP was also confirmed by better fitting of the curve to an exponential function than the power law function (p<0.05). Therefore, when working with children with unilateral CP, sufficient practice is important (two to three times more than for TDC), and delayed improvement is expected.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2013.03.008