The role of cognitive load on motor performance of the ipsilesional arm in stroke survivors with severe hemiparesis.
Pramisha Thapa, Lelti Asgedom, Mark Folkertsma and 3 others
PMID 40832856WHAT IT FOUND
Adding cognitive load to a reaching task slowed reaction time and worsened accuracy for all participants.
Those with right hemisphere damage moved less efficiently than those with left hemisphere damage, but only when the task became mentally demanding.
Key findings
01Reaction time increased with higher cognitive load, but there was no overall difference in reaction time between right and left hemisphere damage groups.
02Participants with right hemisphere damage produced less spatially efficient hand trajectories than those with left hemisphere damage, particularly as cognitive load increased.
03Directional error at both peak acceleration and the end of the trial increased with cognitive load, though significant group differences in accuracy were not found.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample size was very small (15 participants), which limits the ability to detect differences between groups and increases the risk that findings are due to chance. The study only included individuals with severe weakness in the opposite arm, so results may not apply to stroke survivors with mild or moderate impairment. The specific type of cognitive load used (visuospatial and working memory) may not generalize to other forms of cognitive demand like verbal or emotional processing. Lesion size and location were not accounted for in the analysis, which could influence motor outcomes. This was a cross-sectional observational study, so it describes performance at one point in time rather than tracking recovery or change with therapy.
Declared interests
None reported in the provided text.
The easy way to misread this
Do not assume that cognitive load affects motor performance equally across all stroke survivors or that it worsens reaction time more in right hemisphere damage. The study found no main group difference in reaction time, and the specific deficit in path efficiency was only apparent under high cognitive load, not during simple movement.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →