Brain computer interface(BCI)is a rapidly developing rehabilitation technology in recent years, which has been gradually used for cognitive rehabilitation of stroke patients.BCI can activate brain regions related to cognition to a greater extent through motor imagery and neural feedback technology, promote functional connectivity between brain regions, and ameliorate cognitive impairment after stroke.This paper summarized the mechanisms involved in BCI promoting cognitive rehabilitation and current applications of BCI in post-stroke cognitive impairment, and identifies the shortcomings of BCI in the treatment of post-stroke cognitive impairment, in order to provide insight for the research and clinical practice of BCI in post-stroke cognitive rehabilitation.

Objective:To investigate the impact of Tai Chi on brain network topology in patients with type 2 diabetes mellitus(T2DM)and mild cognitive impairment(MCI).Method:Patients with T2DM and MCI were recruited and randomly assigned to three groups:Tai Chi group(n=33),fitness walking group(n=31),and health education control group(n=35).Cognitive function was as-sessed using the Montreal Cognitive Assessment(MoCA)at baseline and after 24 weeks of intervention.Mag-netic resonance imaging(MRI)and graph theory methods were used to analyze characteristic path length,be-tweenness centrality,and nodal efficiency to evaluate brain network topology.Result:After 24 weeks,the MoCA score of the Tai Chi group significantly improved compared to the con-trol group(P=0.016),but there was no significant difference compared to the fitness walking group.No signif-icant changes in characteristic path length were observed among the three groups.Compared to the control group,the betweenness centrality in the Tai Chi group significantly increased in the right precentral gyrus,right middle temporal gyrus(temporoccipital part),and left angular gyrus.Additionally,the betweenness cen-trality in the bilateral middle temporal gyri(temporoccipital part)was higher in the Tai Chi group than in the fitness walking group.Nodal efficiency in the right supramarginal gyrus(posterior part)significantly increased in the Tai Chi group compared to the control group.Correlation analysis showed that the change in between-ness centrality of the left middle temporal gyrus in the Tai Chi group was positively correlated with the change in MoCA score(r=0.642,P＜0.001),and the nodal efficiency of the right supramarginal gyrus was also positively correlated with the change in MoCA score(r=0.372,P=0.033).Conclusion:This study preliminarily reveals that Tai Chi may improve cognitive function in patients with T2DM and MCI by modulating the local topological properties of brain networks,particularly in the left mid-dle temporal gyrus and right supramarginal gyrus.

Objective:To investigate the impact of Tai Chi on brain network topology in patients with type 2 diabetes mellitus(T2DM)and mild cognitive impairment(MCI).Method:Patients with T2DM and MCI were recruited and randomly assigned to three groups:Tai Chi group(n=33),fitness walking group(n=31),and health education control group(n=35).Cognitive function was as-sessed using the Montreal Cognitive Assessment(MoCA)at baseline and after 24 weeks of intervention.Mag-netic resonance imaging(MRI)and graph theory methods were used to analyze characteristic path length,be-tweenness centrality,and nodal efficiency to evaluate brain network topology.Result:After 24 weeks,the MoCA score of the Tai Chi group significantly improved compared to the con-trol group(P=0.016),but there was no significant difference compared to the fitness walking group.No signif-icant changes in characteristic path length were observed among the three groups.Compared to the control group,the betweenness centrality in the Tai Chi group significantly increased in the right precentral gyrus,right middle temporal gyrus(temporoccipital part),and left angular gyrus.Additionally,the betweenness cen-trality in the bilateral middle temporal gyri(temporoccipital part)was higher in the Tai Chi group than in the fitness walking group.Nodal efficiency in the right supramarginal gyrus(posterior part)significantly increased in the Tai Chi group compared to the control group.Correlation analysis showed that the change in between-ness centrality of the left middle temporal gyrus in the Tai Chi group was positively correlated with the change in MoCA score(r=0.642,P＜0.001),and the nodal efficiency of the right supramarginal gyrus was also positively correlated with the change in MoCA score(r=0.372,P=0.033).Conclusion:This study preliminarily reveals that Tai Chi may improve cognitive function in patients with T2DM and MCI by modulating the local topological properties of brain networks,particularly in the left mid-dle temporal gyrus and right supramarginal gyrus.

Objective: To investigate the association between sleep duration and frailty among people aged 50 years and over. Methods: Cross-sectional data was collected from the first wave of World Health Organization Study on global AGEing and adult health in China. Frailty index was constructed on the proportion of deficits, out of the 40 variables. A two-level (individual level and community level) linear model was performed to identify the related factors on frailty. All the models were stratified by age, gender, residence (urban/rural). Restricted cubic spline was performed to graphically evaluate the dose-response association between self-reported sleep duration and frailty. Results: A total of 13 175 individuals aged 50 years and over participated in this study. Without adjusting on any confounding factors, shorter or longer sleep duration significantly increased the risk of weakness compared with normal sleep time (OR=2.05, 95%CI: 1.71-2.44; OR=1.35, 95%CI: 1.12-1.63). After adjusting for confounding factors such as gender, age, residence, education, family assets, vegetable, smoking, drinking and physical activity, a positive association between short sleep duration and frailty was noticed compared with normal sleep time (aOR=1.60, 95%CI: 1.27-2.01). The results of stratified analysis on sex, age and urban and rural areas showed that, after adjusting for gender, age, residence, education level, family assets, intake of vegetables and fruits, smoking, drinking and physical activity, only shorter sleep duration was positively correlated with the risk of weakness. In addition, among people aged 65 years and over, adjusted for confounding factors, the risk of weakness increased by 91%, compared with normal sleep time (aOR=1.91, 95%CI: 1.46-2.49). The dose-response curve also showed that the sleep duration and frailty present an approximate "U" shaped relationship. Conclusion Short sleep duration might be associated with frailty.