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Endpoint stiffness is adapted to the curvature of the objects for forces in the main study: negative–x direction. A, Endpoint stiffness represented as an ellipse for all subjects (S1-S6), object curvatures (color codes shown) and experimental sessions. B, Size (± sem) of the stiffness ellipses for the different objects for the blocked (red circles) and random (blue squares) sessions. C, Orientation (± sem) of the stiffness ellipses.
