Fig. 2From: Effect of post-stroke spasticity on voluntary movement of the upper limbAn example of elbow joint motion traces and respective GMMs. The y-axis shows elbow extension angles scaled to [− 1, 1]. The x-axis shows the time scaled to the average movement time. The traces are overlaid with an ellipsoid-based representation [48] of the respective Gaussian mixture models for a control participant (left) and a participant with stroke (right, FMA = 36, TSRT = 128.3°) for reaches toward each target. Each ellipsoid depicts one distribution component. Ellipsoids are located at the component mean, with axes along the directions of the covariance matrix eigenvectors and show the solutions to \({\left(x-\mu \right)}^{^{\prime}}{\Sigma }^{-1}\left(x-\mu \right)\) of a respective component. NC near-center, FC far-center, CL contralateral, IL ipsilateralBack to article page