The Priming Effects of Mirror Visual Feedback on Bilateral Task Practice: A Randomized Controlled Study.
Yi-Chun Li, Ching-Yi Wu, Yu-Wei Hsieh and 4 others
PMID 31824233WHAT IT FOUND
Adding mirror visual feedback to bilateral arm training did not improve motor function more than training alone.
However, patients using the mirror showed significant gains in self-perceived quality of life and a trend toward better temperature sensation, suggesting the visual illusion may help with sensory and emotional recovery rather than just movement.
Key findings
01There was no significant difference in upper extremity motor impairment (Fugl-Meyer Assessment) between the mirror therapy group and the bilateral training group.
02The mirror therapy group demonstrated a significant and large improvement in self-perceived quality of life (Stroke Impact Scale) compared to the bilateral training group.
03The mirror therapy group showed a potential trend for improved temperature sense, with 44.44% achieving a clinically important difference compared to 16.67% in the control group, though this did not reach statistical significance.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
The sample size was very small (23 participants total), which limits the power to detect differences and makes the findings preliminary. The study only measured outcomes immediately after the four-week intervention, so long-term retention of effects is unknown. The size of the mirror box may have restricted the range of movements possible in the MT group, potentially limiting motor gains. Individual differences in how patients experienced the mirror visual feedback were not controlled for or measured. The study did not analyze subgroups based on stroke subtype (hemorrhagic vs ischemic) or age due to the small sample size.
Declared interests
The authors declare no conflicts of interest. The study was funded by the Ministry of Science and Technology, Taiwan.
The easy way to misread this
Do not conclude that mirror therapy is superior to bilateral arm training for motor recovery. The primary outcome for motor function showed no significant difference between the groups. The significant finding was for self-perceived quality of life, and the sensory findings were non-significant trends. The small sample size means these results should be viewed as hypothesis-generating rather than definitive evidence for changing standard motor rehabilitation protocols.