Table 1.
Participant characteristics.
Figure 1.
The stepping constraints are illustrated from the perspective of P8 before she started walking at the start of each trial. Typically P8 would require 5–7 steps between initiating gait at the starting position and stepping in the first stepping guide. The centres of both the foot and stepping guide were calculated as the intercept between the medio-lateral and anterior-posterior coordinates of each, as illustrated by the black dotted lines. The red arrow represents the absolute error of foot placement in the stepping guide, calculated as the distance between the central positions of the foot and stepping guide.
Figure 2.
All plots represent mean values for both pre- and post-fall sessions.
a) time of gaze transfer from the stepping guide, b) mean absolute error, c) M-L error (where positive values represent a lateral foot placement bias in the stepping guide), d) A-P error (where positive values represent an anterior foot placement bias in the stepping guide). Error bars represent the standard deviations of the mean for each session. Horizontal dotted lines represent 2SD above mean values from all 40 pre-fall trials.
Figure 3.
Correlation between the time of gaze transfer from the stepping guide and corresponding absolute foot placement error.
Vertical dashed lines represent the time of foot contact in the stepping guide. The black and gray solid lines represent the lines of best fit for pre-fall and post-fall data, respectfully.