Resolution: standard / high
Figure 2.
Exploded drawing of the neck coordination exercise device, including the removable rim and an exchangeable surface. Four different surfaces were used in order to vary the rolling resistance of the ball.
Röijezon et al. Journal of NeuroEngineering and Rehabilitation 2008 5:36 doi:10.1186/1743-0003-5-36
Download authors' original image