Fig. 4.

Calculated trajectories for the right foot around the U-shaped (left two columns) and S-shaped (right two columns) corridors, for control (top row), PCA (middle row) and tAD (bottom row), walking in one direction and then returning in the opposite direction (the arrow indicates the direction of walk). The origin was set as the same for all participants, though in practice this was not necessarily the case. Crosses indicate the positions of hesitant steps, defined as a step time >3 standardised residuals from the mean for each participant