marginally significantp = 0.06
In the upper alpha band, there were no significant effects of Training or Task, apart from a marginally significant interaction between Task and Hemisphere [ F (1,19) = 4.07, p = 0.06, η 2 = 0.18], which revealed a larger hemispheric ERD difference (in favor of the right hemisphere) in the figural-spatial compared to the multiplication problems.