Corpus Callosal Microstructure Predicts Bimanual Motor Performance in Chronic Stroke Survivors: a Preliminary Cross-Sectional Study.
Rini Varghese, Brianna Chang, Bokkyu Kim and 3 others
PMID 35856402WHAT IT FOUND
In chronic stroke survivors, poorer corpus callosum fiber organization was linked to slower bimanual task performance among those who used both hands, not among those who used one hand.
Key findings
01Lower mean callosal fractional anisotropy was associated with slower movement time only in chronic stroke survivors who chose a bimanual strategy, not in those who chose a unimanual strategy.
02The association was seen in motor, premotor and supplementary motor, and prefrontal callosal regions, and the motor region slope did not significantly differ from the prefrontal or premotor slopes.
03Compared with neurologically intact older adults, chronic stroke survivors had lower mean callosal fractional anisotropy in all regions except the splenium.
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 was preliminary and cross-sectional, so it cannot show that callosal microstructure caused slower movement or predicted recovery. Behavioral data were available for 33 of the 41 stroke survivors. Participants chose their own strategy, so the one-hand and two-hand groups were not randomly assigned. The control MRI data came from different scanners and collection years, and scanner variance was modeled but not removed. Only one bimanual task was tested, and no behavioral data were collected in controls. FA is an indirect measure of fiber organization, and fiber crossing can affect it. The sample was chronic stroke survivors with mild to moderate impairment, so results may not apply to severe impairment. No intervention was tested.
Declared interests
The supplied article text does not include a conflict of interest declaration. The publication types list NIH extramural research support.
The easy way to misread this
Do not read the callosal association as proof that poor corpus callosum structure caused all slow upper limb movement. The relationship was significant only for the self-selected bimanual strategy and not for the unimanual strategy, and the study was cross-sectional.