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Published online 2008 Nov 17. doi:  [10.1186/1746-1340-16-15]

Figure 4

Statokinesigrams (sway area) during eyes-closed conditions on a soft surface with different head positions:
(A) head neutral;
(B) left lateral flexion;
(C) right lateral flexion;
(D) extension.
(grey line): pre-intervention COP displacement;
(black line): post-intervention COP displacement.