Figure 1.

Gait task. Example of one run (±6.5 min) of the gait task. Participants walk up and down a corridor, halfway passing through a narrow doorway frame (60 cm wide), and at the ends making 180° turns in a square taped on the floor (50 cm wide). The distance between the doorway and the square was set at an individualized walking distance of ∼20 s. Each 2.5 corridor length, participants were instructed to stop in front of the door or in the square, to make one step through the door or turn around after 15 s, and then to resume walking after another 15 s. The direction of the turns was alternated between each side of the corridor and this direction was switched after each instructed stop. Each participant completed approximately four runs in total.