Fig. 7

Results on angular distances between PC subspaces. Boxes show first and third quartiles, whiskers show min and max values. Top row: between hybrid controls and natural control in baseline phase. Bottom row: between hybrid controls and mimicked real arm motion produced in the same test phase. Blue: condition C+; purple: condition C−. Significant differences are indicated with stars: *\(\hbox {p} < 0.05\); **\(\hbox {p} < 0.01\)