Obstacle Avoidance amongst Parkinson Disease Patients Is Challenged in a Threatening Context
Figure 2
Top-down view illustration of obstacle crossing, with horizontal spatial measures of interest. Obstacle is marked in diagonal lines, while lead and trail feet are indicated by black and gray ovals, respectively. Measures shown are (A) trail foot precrossing clearance (), (B) lead foot postcrossing clearance (), (C) lead foot crossing step length (CRLEAD), and (D) trail foot crossing step length (CRTRAIL). Step lengths were averaged (SL). Not shown is horizontal centre of mass crossing velocity (CVCOM), and vertical toe clearance ().
