Objective Evaluation of Obstacle Perception Using Spontaneous Body Movements of Blind People Evoked by Movements of Acoustic Virtual Wall

Figure 3

Wall and body movements as functions of time, and the correlation function between the wall and body movements as a function of the time difference. (a, b) The results for the ten blind and seven participants who are sighted, respectively. “Blind No.” and “Sighted No.” at the top-left of each graph show the ID number assigned to each participant. The upper, middle, and lower parts of each graph show the presented wall movements, the measured body movements, and their correlation function, respectively. The scales of the axes are shown in the line second from the top of the rightmost graph. For the body movements, the standing position of the participant is zero, and back direction has a negative value.