Tools to objectively assess upper extremity function and activity Grippit: The handgrip force will be recorded, both the peak maximum grip force and the mean value of the ten-second sustained grip for the right hand Kinematics: An optoelectronic system is used for the three-dimensional motion analysis. This system includes an advanced optoelectronic camera system that produces clean and accurate 3D data. Ball shaped markers are positioned on the body, and reflect infrared light from camera flashes. Data analysis itself is performed with special software. The drinking task test is performed with the person sitting in a standardized manner ARAT (Action research Arm Test) is a performance test for UE function and dexterity.