The Sway-Density Curve and the Underlying Postural Stabilization Process

in Motor Control
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The sway-density curve (SDC) is computed by counting, for each time instant, the number of consecutive samples of the statokinesigram falling inside a circle of “small” radius R. The authors evaluated the sensitivity of the curve to the variation of R and found that in the range 3–5 mm the sensitivity was low, indicating that SDC is a robust descriptor of posturographic patterns. In addition, they investigated the relationship between SDC and the underlying postural stabilization process by decomposing the total ankle torque into three components: a tonic component (over 69% of the total torque), an elastic torque caused by ankle stiffness (about 19%), and an anticipatory active torque (about 12%). The last component, although the smallest in size, is the most critical for the overall stability of the standing posture and appears to be correlated with the SDC curve.

Jacono, Morasso, and Sanguineti are with the Center of Bioengineering, Hospital La Colletta, Arenzano, Italy\aq\, Casadio, Morasso, and Sanguineti are with the Dept. of Informatics, Systems and Telecommunication, University of Genova, Italy.

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