Delayed motor skill acquisition in kindergarten children with language impairment.
Language impairment delays the overnight motor-learning boost, so give these kids more practice days, not more pressure.
01Research in Context
What this study did
Adi-Japha et al. (2011) watched kindergarten kids learn a new motor task.
Some kids had language impairment. Some had typical language.
All kids practiced the task for two weeks while the team tracked speed and accuracy.
What they found
Kids with language impairment started slow and showed no overnight jump in speed.
By the end of two weeks they caught up, but the early gap stayed gone.
The quick "sleep makes it better" boost that typical kids got simply did not show up.
How this fits with other research
Adi-Japha et al. (2011) also tested young women with ADHD using the same task.
Those women gained speed yet lost accuracy after one night, a different twist on shaky consolidation.
Højberg et al. (2023) found the opposite story in adults with Down syndrome: they kept both speed and accuracy gains after a week, showing solid overnight learning.
Together the three papers say the same task can expose different weak spots across diagnoses—language kids miss the first-night boost, ADHD learners trade speed for next-day errors, and Down syndrome learners hold on to both.
Why it matters
If you teach motor skills to children with language impairment, do not panic after day one.
Plan extra practice sessions instead of expecting the usual "sleep on it" jump.
Track progress across weeks, not mornings, and celebrate the slower but steady climb to mastery.
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02At a glance
03Original abstract
The acquisition and consolidation of a new grapho-motor symbol into long-term memory was studied in 5-year-old children with language impairment (LI) and peers matched for age and visual-motor integration skills. The children practiced the production of a new symbol and were tested 24h and two weeks post-practice day. Differences in performance speed emerged between the groups: children with LI showed a later onset of rapid learning in the practice phase, and only the comparison group exhibited delayed, consolidation, gains 24h post-training. At two weeks post-training, children with LI improved, closing the gap in performance speed. Speed-accuracy trade-off was characteristic of speed improvements in LI. These results indicate atypical and delayed acquisition in children with LI, and support the view that deficient skill acquisition in LI goes beyond the language system.
Research in developmental disabilities, 2011 · doi:10.1016/j.ridd.2011.05.005