Qualitative

Using an animation which had proved effective with T.R., we were able to increase D.L.'s stride length. Since D.L. was able to initiate without visual cues, we did not face the initiation issues discussed in Section 5.1.

In the D.L. trials, we discovered that an animation moving straight down the screen of the VV Sport display is not as useful when turning corners or walking in a circle as when walking in a straight line. This is to be expected, since when turning the image does not appear to be fixed on the ground.

Chasing the laser pointer produced observable results as good or better than those with the VV Sport display.

Switching the laser pointer on and off as D.L. walked was sufficient to cause him to switch instantly between a better and worse gait. For D.L., there was not a learning curve associated with the laser pointer, as there had been with T.R. Nor did his gait improve over time in the absence of cues. This may be related to the relative severity of T.R.'s akinesia.