Atypical acquisition and atypical expression of memory consolidation gains in a motor skill in young female adults with ADHD.
Motor skills in ADHD can look mastered until the next day, when accuracy may crash even though speed stays high.
01Research in Context
What this study did
Adi-Japha et al. (2011) asked 24 college-age women with ADHD and 24 without to tap a repeating finger sequence as fast and accurate as possible. They practiced for 30 minutes, then came back after 24 hours and again after two weeks.
The team logged speed and accuracy each time. They wanted to see if the ADHD group stored the motor memory the same way overnight and across days.
What they found
Right after practice both groups sped up equally. One day later the ADHD women were still fast, but their accuracy dropped below where they started. It took a full two weeks for their accuracy to crawl back to day-one levels.
The non-ADHD women held both speed and accuracy steady after the first night.
How this fits with other research
Sharp et al. (2010) ran a near-copy study with high-functioning young adults with ASD. Those learners kept both speed and accuracy after 24 hours, showing the overnight loss is specific to ADHD, not every neurodiverse group.
Chang et al. (2013) used digital tablets to catch hidden handwriting problems in grade-school kids with dysgraphia. Together the papers show that fine-motor deficits can sit silent during practice and only show up later—whether the cause is ADHD consolidation failure or dysgraphia movement noise.
Storch et al. (2012) found routine brain MRIs are usually normal in ADHD. The behavioral slip Esther saw happens even when the scan looks fine, so the problem is likely in how circuits talk, not how they look.
Why it matters
If you teach a keyboard shortcut, bike skill, or utensil grip to a client with ADHD, check performance the next day before you call it mastered. A quick next-day probe—‘Show me yesterday’s sequence’—can catch hidden accuracy loss early and save reteaching time later.
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02At a glance
03Original abstract
Individuals with ADHD often show performance deficits in motor tasks. It is not clear, however, whether this reflects less effective acquisition of skill (procedural knowledge), or deficient consolidation into long-term memory, in ADHD. The aim of the study was to compare the acquisition of skilled motor performance, the expression of delayed--consolidation phase--gains and retention, in persons with and without ADHD. Thirty-two participants, 16 with ADHD, were trained on a sequence of finger movements using a well-established training protocol, and tested before training and immediately, 24h and 2 weeks after training. Both groups showed similar within-session gains in speed; additional, delayed gains were expressed at 24h, but less robustly in ADHD, and at 2 weeks post-training. However, while controls showed significant delayed gains in accuracy at 24h and 2 weeks post-training, accuracy deteriorated in ADHD from pre-training to 24h post-training and was only at pre-training levels by 2-weeks post-training. Our results demonstrate a latent memory consolidation phase in motor sequence learning, expressed as delayed gains in speed and a much delayed recovery of pre-training accuracy, in individuals with ADHD. However, both the acquisition and memory consolidation of motor skills are atypical in ADHD.
Research in developmental disabilities, 2011 · doi:10.1016/j.ridd.2011.01.048