Cortical adaptations in Tai Chi practitioners during sensory conflict: an EEG-based effective connectivity analysis of postural control.
Guozheng Wang, Xiaoxia Liu, Yiming Cai and 3 others
PMID 40437591WHAT IT FOUND
Young, experienced Tai Chi athletes swayed less than non-practisers on a rotating platform under visual-vestibular conflict.
Their EEG showed stronger right somatosensory outflow and weaker right parietal outflow. This links long-term training to sensory re-weighting, not to Tai Chi as a treatment.
Key findings
01Tai Chi practitioners had significantly smaller centre-of-pressure sway area than controls across both congruent and conflict conditions, with no Group × Condition interaction.
02In the mu band, practitioners showed higher out-strength from the right somatosensory cortex and lower out-strength from the right posterior parietal cortex than controls, with no Group × Condition interaction for either.
03Sensory conflict itself, in both groups, raised global efficiency of the sensorimotor integration network and lowered global efficiency of the visual integration network, with no significant main effect of training on either.
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 compared people who already practised Tai Chi for years with people who did not. It cannot show that starting Tai Chi caused the brain differences, because no one was followed over time. The participants were national-level athletes aged 18–35, healthy, and free of dizziness, anxiety and cognitive impairment. The authors state that extrapolating to older adults, who are the usual target for Tai Chi balance programmes, requires caution. EEG analysis lost 10 of 52 participants to equipment failure and body movement, and the final EEG groups (19 practitioners, 23 controls) were smaller than the balance groups. The sensory conflict was one artificial scenario: continuous rotation on a platform with a mismatched VR scene for 36 seconds. The authors say it is wrong to assume the same brain changes happen for a sudden push, a trip, or vestibular loss. Brain sources were estimated with a standardised head model rather than each participant's own MRI, which the authors note can misplace the exact origin of the signals. No muscle recordings were taken, so the link between these brain changes and what the legs actually did could not be checked. The authors report that the sample was small, though adequate for the effects they found.
Declared interests
Funding came from the Zhejiang Provincial Medical and Health Science Research Fund Committee. The supplied text contains no author disclosure statement and no statement about whether the funder designed the study or wrote the manuscript.
The easy way to misread this
Do not read this as evidence that prescribing Tai Chi will change a patient's brain connectivity or prevent their falls. The study compared young national-level athletes with years of practice against non-practitioners at a single time point, so the brain differences could reflect who chose to train intensively rather than what training produced, and the authors state that the findings should not be extrapolated to older adults without caution.