Representative example of the postural outcome.

<p>The plots illustrate the effect of practice on the balance board motion exhibited by one participant during three trials (t1, t5, t3) performed across three sessions (S1, S2, retention). (A) Amplitude of angular oscillations of the board around the horizontal plane regardless of the direction. Dashed lines indicate the mean values. (B) Area covered by the unit normal vector expressed as 95% confidence ellipse. (C and D) Amplitude of oscillations of the unit normal vector along Antero-Posterior (AP) and Medial-Lateral (ML) directions. (E and F) Power Spectral Density analysis performed in AP and ML directions. Dashed lines indicate the Mean Power Frequency. The axes values reported in B and in vertical axes of C and D derive from measurements of the space as unit vector.