Fig. 1.

The effect of instructed focus and walking task difficulty on cognitive task response latency (a) and response accuracy (b). Symbols represent means for cognitive task performance in the single task (ST) condition (diamonds) and under usual-base (squares) and narrow-base (triangles) walking dual task conditions. Bars represent standard errors (note standard errors for response accuracy were <1% in all cases). ST single task condition, walk focus walking focus condition, cog focus cognitive task focus condition