Mild Stroke Affects Pointing Movements Made in Different Frames of Reference.
Fariba Hasanbarani, Marc Aureli Pique Batalla, Anatol G Feldman and 1 others
PMID 33514272WHAT IT FOUND
People with mild stroke could not keep their hand path steady when their trunk was unexpectedly blocked while reaching, in both body-centered and external space.
Healthy adults adjusted instantly; stroke survivors diverged early. This points to a motor planning deficit missed by standard impairment scores.
Key findings
01Stroke participants' hand trajectories diverged significantly earlier from the free-trunk path when the trunk was blocked, in both egocentric and exocentric tasks, unlike healthy controls.
02The inability to adjust arm movements was linked to cognitive scores (MoCA) but not to the level of physical upper-limb impairment (Fugl-Meyer).
03Deficits were present even in individuals with mild stroke and high clinical scores, suggesting routine tests may miss these higher-order motor planning issues.
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 study only included people with mild stroke and no apraxia or neglect, so findings do not apply to more severe impairments. Healthy controls used their non-dominant arm for comparison, which may introduce bias. The small sample size limits generalizability. Muscle activity and detailed lesion data were not analyzed, so the specific neural mechanisms remain inferred.
Declared interests
The authors declared no conflicts of interest and no financial support for the research.
The easy way to misread this
Do not assume that a patient with a high Fugl-Meyer score has normal motor planning. This study shows that cognitive factors, not just physical impairment, drive the inability to adapt arm movements to unexpected trunk blocks.