Research on performance of motor-imagery-based brain-computer interface in different complexity of Chinese character patterns / 生物医学工程学杂志

The traditional paradigm of motor-imagery-based brain-computer interface (BCI) is abstract, which cannot effectively guide users to modulate brain activity, thus limiting the activation degree of the sensorimotor cortex. It was found that the motor imagery task of Chinese characters writing was better accepted by users and helped guide them to modulate their sensorimotor rhythms. However, different Chinese characters have different writing complexity (number of strokes), and the effect of motor imagery tasks of Chinese characters with different writing complexity on the performance of motor-imagery-based BCI is still unclear. In this paper, a total of 12 healthy subjects were recruited for studying the effects of motor imagery tasks of Chinese characters with two different writing complexity (5 and 10 strokes) on the performance of motor-imagery-based BCI. The experimental results showed that, compared with Chinese characters with 5 strokes, motor imagery task of Chinese characters writing with 10 strokes obtained stronger sensorimotor rhythm and better recognition performance (

Clinical efficacy of neurofeedback training on children with tic disorder / 中华行为医学与脑科学杂志

Objective To investigate the effect of neurofeedback training for tics symptoms and electroencephalogram (EEG) spectrum change in children with tic disorder.Methods 19 patients with transient tic disorder (TTD),20 with chronic motor or vocal tic disorder (CTD) and 15 with Tourette' s disorder (TS) received 40 sessions of neurofeedback training.The clinical effect was evaluated with Yale Global Tic Severity Scale,and brain activity improvement with EEG theta/beta,theta / sensorimotor rhythm (SMR) power ratio.Results The patients with three types of tic disorder all showed a reduction of tics symptoms (TTD:10.32 ± 0.82 vs.5.91 ± 5.74;CTD:12.35 ±1.50 vs.4.00 ±2.22; TS:25.33 ±2.80 vs.13.73 ±4.22; P＜0.01).Additionally,the patients showed theta decreasing and SMR enhancing after the sessions.The ratio of theta/beta (TTD:2.52 ±0.38 vs.2.33 ±0.32;CTD:2.43 ±0.39 vs.2.21 ±0.30; TS:2.64 ±0.35 vs.2.39 ±0.26) and theta/SMR was significantly lower than before treatment (P ＜ 0.01).Conclusion Neurofeedback training is an effective and valuable treatment in tic disorder especially in the patients with transient tic disorder and mild chronic motor or vocal tic disorder.