Fig. 2

Time-varying frontal-plane group averaged H during two consecutive strides of each transition condition. Black lines represent for anticipated and unanticipated straight-line walking, while color lines represent for transitions. Solid lines indicate anticipated conditions, while dash lines indicate unanticipated conditions. Vertical lines represent chronological events of the first toe-off of the trailing leg (occurrence of the cue), the first leading leg toe-off, and the second trailing leg toe off