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  • Title: Two-dimensional coherence for measurement of asymmetry in postural steadiness.
    Author: Myklebust JB, Lovett EG, Myklebust BM, Reynolds N, Milkowski L, Prieto TE.
    Journal: Gait Posture; 2009 Jan; 29(1):1-5. PubMed ID: 18603428.
    Abstract:
    Two-dimensional magnitude squared coherence (2D-MSC) is developed to compare the two-valued time series which represent the center of pressure (COP) under each foot. A sinusoidal multiple taper spectral estimator is used to reduce bias and improve spectral resolution. The measure is applied to evaluate symmetry in the dual-plate postural steadiness time series obtained from healthy young and elderly volunteers, and patients with Huntington's Disease (HD), a group in which asymmetries in postural steadiness are anticipated. The results demonstrate that the 2D-MSC is a robust measure of inter-limb coordination that may be of value in studies of aging and neurologic disease.
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