Motor imagery ability in children with congenital hemiplegia: effect of lesion side and functional level.
Daily function level predicts how well kids with hemiplegia can picture hand moves, not which side of the brain is hurt.
01Research in Context
What this study did
Nadel et al. (2011) asked kids with congenital hemiplegia to picture hand movements in their mind.
They compared left-brain damage kids with right-brain damage kids.
They also split the group by how well each child could already move in daily life.
What they found
Kids who moved poorly in real life also pictured hand moves poorly.
Left-side weakness kids scored a bit lower, but the side of the brain lesion did not predict the score.
Daily-life function level told the story better than brain scan side.
How this fits with other research
McDuffie et al. (2016) looked at preschoolers with CP and found that deep brain lesions hurt speech more, yet gross motor level still explained most of the talking trouble.
The two studies seem to clash: one says lesion side matters, the other says function level wins.
The gap closes when you see age and task differences: Andrea studied tiny tots and talking, Jacqueline studied older kids and imagined moves.
Hung et al. (2012) used real reach-grasp-eat moves and saw the same planning problems Jacqueline saw in the mind-only task, showing the issue spans both real and imagined action.
Galli et al. (2010) also found left hemiplegia kids walked slower, again hinting left-side damage can show extra struggle, but function level still guides therapy goals.
Why it matters
When you test motor imagery in school-age hemiplegia clients, score their daily function first.
Use the Functional Level score, not the MRI side, to decide if mental-practice drills are worth the time.
If function is low, add extra prompts or skip imagery and go straight to active movement with bimanual aids like Janssen et al. (2011) showed.
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02At a glance
03Original abstract
In addition to motor execution problems, children with hemiplegia have motor planning deficits, which may stem from poor motor imagery ability. This study aimed to provide a greater understanding of motor imagery ability in children with hemiplegia using the hand rotation task. Three groups of children, aged 8-12 years, participated: right hemiplegia (R-HEMI; N=21), left hemiplegia (L-HEMI; N=19) and comparisons (N=21). All groups conformed to biomechanical limitations of the task, supporting the use of motor imagery, and all showed the expected response-time trade-off for angle. The general slowing of responses in the HEMI groups did not reach significance compared to their peers. The L-HEMI group were less accurate than the comparison group while the R-HEMI group were more variable in their performance. These results appeared to be linked to functional level. Using the Vineland Adaptive Behavior Composite, children were classified as low or normal functioning - of the seven classified as low function, six were in the L-HEMI group. Accuracy was lower in the low function subgroup, but this failed to reach significance with an adjusted critical value. However, there was a strong correlation between function level and mean accuracy. This indicates that motor imagery performance may be more closely linked to function level than to the neural hemisphere that has been damaged in cases of congenital hemiplegia. Function level may be linked to the site or extent of neural damage or the level of cortical reorganisation experienced and more attention should be paid to neural factors in future research.
Research in developmental disabilities, 2011 · doi:10.1016/j.ridd.2010.11.006