Figure 1: Dual-task effects on gait speed (DTEg) shown as a function of cognitive task and group for (a) walking at self-selected speed, (b) walking at fastest comfortable speed, and (c) walking at fastest comfortable speed and stepping over on obstacle. The interaction between cognitive task and group was significant for the fast comfortable walking condition (b), but not for the other two gait tasks. Error bars indicate standard error of the mean. DTEg are adjusted values for education in the Gait Task Cognitive Task Group ANCOVA; young adults, older adults.