Expansion of attentional scope modulates postural control, motor strategies, and attentional network connectivity in healthy adults: a proof-of-concept mixed-methods study.

Participants were allocated sequentially and alternately within sex strata, not by random sequence, and allocation was not concealed. The same physical therapist delivered training, measured balance, and conducted interviews, and no assessor or interviewer blinding was used, so expectancy, observer, and interviewer bias could have affected results. The sample was small and homogeneous, with 50 recruited and 48 analysed, and it included only healthy adults aged 20 to 39 years, so it does not show what would happen in patients or older adults. The training was a single 10-minute session, and follow-up was only 30 minutes, so durability is unknown. The mean postural stability change in the attentional-expansion group did not exceed the Minimal Detectable Change threshold of 0.26, so it may not be meaningful for an individual. The attentional-expansion protocol combined plantar discrimination with therapeutic dialogue, so the improvement cannot be attributed to the dialogue component alone. The attentional-expansion protocol included therapeutic dialogue, so post-training words about shoulders or body parts may have been influenced by the prompts. Participants could have used other sensory inputs, such as ankle or knee proprioception or vision, during training, so the role of plantar sensation alone cannot be isolated. Functional MRI was collected only immediately before and after training, and the study did not find a significant association between connectivity change and balance change, so the brain findings cannot be treated as a mechanism. Text-mining frequency analysis may under-represent low-frequency but meaningful participant expressions.

The work received a publication-expense research grant from the International University of Health and Welfare. The authors declared financial support, and the funder had no role in study design, data collection, analysis, or interpretation.

Do not conclude that this training improves balance for patients. The participants were healthy young adults, the average change did not reach the threshold for individual meaningful change, and the study did not show a significant link between brain connectivity change and balance improvement.