Other experiments at Graybiel are trill rides for only the most daring student volunteer. Lackner and DiZio have worked on problems with eye-hand coordination, visual tracking, auditory response, and other normal human functions. None of these problems are insurmountable. Some might even be beneficial. But it is clear that artificial gravity is no walk in the park.
Humans function in the gravitational-force environment of Earth without ever thinking about it.
We don't perceive the actual forces on our bodies. When we move about, we feel virtually weightless. So in a new environment, you find that you do make errors if you haven't adapted. We may be children of the universe, but our design parameters and our habits work best in one particular spot of that universe, our gravitational home. We take it for granted.