Results of interaction between variables showed that interaction between groups and periods is significant (F (3.48, 42) =4.849; P=0.003; η 2 =0.188), and a marginally significant interaction is observed between group and brain regions (F (4, 42) =2.461; P=0.051; η 2 =0.105).
As shown in Figure 2 , the results of this test showed that in the pre-test period, a significant difference is observed in the mu rhythm suppression between the three groups of self-modeling, learning model, and skilled model in all three brain regions, in the acquisition period, a one-way ANOVA test showed no significant difference between the experimental groups in C3 (F (2, 42) =1.976, P=0.151), C4 (F (2, 42) =0.211, P=0.811) and only approached significance at Cz (F (2, 42) =2.975, P=0.062) regions.